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Five copper(II), zinc(II) and nickel(II) complexes, [Cu2L2(μ1,1-N3)2] (1), [Zn2L2(μ2-η1:η1-CH3COO)(NCS)]EtOH (2), [Zn2L2(μ2-η1:η1-CH3COO)(N3)]MeOH (3), [Zn2Cl2L2] (4) and [NiL(HL)]ClO4 (5), were prepared from the Schiff base 3-methyl-2-((pyridin-2-ylmethylene)amino)phenol (HL). The compounds have been characterized by physico-chemical methods including elemental analysis, IR, and UV–Vis spectra. Structures of the five new complexes were determined by single crystal X-ray diffraction. The copper ions in 1 are in square pyramidal, while zinc ions in 2, 3, and 4 are distorted square pyramidal, and the nickel ions in 5 are octahedral. The biological assay indicated that zinc complex 2 has the most effective activity on Jack bean urease with IC50 = 1.7 ± 0.8 μmol·L−1. Molecular docking was performed to study the interaction between the active center of the urease with molecules of the complexes. [ABSTRACT FROM AUTHOR]

Four new zinc(II) complexes, [ZnL2] (1), [ZnL(μ2-η1:η1-OAc)]n (2), [Zn2L2(μ1,1-N3)(μ1,3-N3)]n (3) and [ZnL(μ2-1,5-dca)]n (4), and a new nickel(II) complex, [Ni2L2(MeOH)2(μ1,1-N3)2] (5), where L is the deprotonated form of 5-bromo-(((2-(phenylamino)ethyl)imino)methyl)phenol (HL), OAc is acetate and dca is dicyanamide, were synthesized and characterized by elemental analyses, infrared and electronic spectroscopy, and single crystal X-ray determination. Complex 1 is a mononuclear zinc(II) compound, with the Zn(II) in tetrahedral coordination. Complexes 2, 3 and 4 are acetate, azide and dicyanamide bridged polymeric zinc(II) compounds, respectively, with the Zn(II) in distorted trigonal bipyramidal coordination. Complex 5 is an azide bridged dinuclear nickel(II) compound, with the Ni(II) ion having octahedral coordination. The compounds were evaluated for their antibacterial activities on Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas fluorescens and antifungal activities on Candida albicans and Aspergillus niger. Complexes 1 and 2 showed the most effective activity against B. subtilis and E. coli, with MIC values of 1.2–4.7 μM. [ABSTRACT FROM AUTHOR]

Three new copper(II) and nickel(II) complexes, [Cu3L2(μ2-NO3)2(μ1,1-N3)2] (1), [Cu2L2(μ1,1-N3)2]n (2) and [Ni3L2(MeOH)2(μ2-η1:η1-CH3COO)2(μ2-η2:η0-CH3COO)2] (3), where L = 5-bromo-2-((3-methylaminopropylimino)methyl)phenolate, have been synthesized and characterized. The complexes were characterized by elemental analyses, IR, UV–Vis spectra, molar conductivity, and single crystal X-ray diffraction. X-Ray analysis indicates that the Cu ions in 1 are in square pyramidal and octahedral coordination, and the Cu ions in 2 and the Ni ions in 3 are in octahedral coordination. The molecules of the complexes are linked through hydrogen bonds and π···π interactions. The complexes were assayed for antibacterial activities against three Gram-positive bacterial strains (Bacillus subtilis, Staphylococcus aureus, and Streptococcus faecalis) and three Gram-negative bacterial strains (Escherichia coli, Pseudomonas aeruginosa, and Enterobacter cloacae) by the MTT method. [ABSTRACT FROM AUTHOR]

A centipede like thiocyanate-bridged multi-nuclear copper(I/II) complex, [Cu2L(CH3OH)(NCS)3]n, derived from 2-(((2-(dimethylamino)ethyl)imino)methyl)-5-fluorophenol (HL), was prepared and characterized by elemental analysis, IR and UV–vis spectra, as well as single crystal X-ray diffraction. The Cu1 ion in the +2 oxidation state is coordinated by the tridentate Schiff base ligand in a square pyramidal geometry, with the other two sites occupied by one N atom of the thiocyanate ligand and one methanol O atom. The Cu2 ion in the +1 oxidation state is coordinated by one N and three S atoms from four thiocyanate ligands, forming a tetrahedral geometry. The CuI ions are linked by thiocyanate ligands to form a one-dimensional chain with [CuI2(μ1,3,3-NCS)2] as the repeat unit. The [CuIIL(CH3OH)] moieties are linked to the chain through thiocyanate ligands. The complex has remarkable inhibitory activity on Jack bean urease with an IC50 value of 1.3 μmol L–1. [ABSTRACT FROM AUTHOR]

Abstract Three new copper(II) and cadmium(II) complexes, [Cu(L1)2] (1), [CuL2(N3)] (2), and [Cd(L3)2] (3), where L1 = 2-bromo-4-chloro-6-cyclohexylaminomethylphenolate, L2 = 2-bromo-4-chloro-6-[(2-morpholin-4-ylethylimino)methyl]phenolate, and L3 = 2-bromo-4-chloro-6-[(3-morpholin-4-ylpropylimino)methyl]phenolate, have been prepared and structurally characterized by X-ray crystallography. The Cu atom in complex 1 is in tetrahedrally distorted square planar geometry. The Cu atom in complex 2 is in square planar geometry. The Cd atom in complex 3 is in octahedral geometry. The complexes exhibited effective activities against B. subtilis, S. aureus and E. coli. [ABSTRACT FROM AUTHOR]

A series of copper, nickel and zinc complexes, [CuClL] (1), [CuBrL] (2), [NiL2] (3), [ZnL2] (4) and [Zn2I2L2] (5), where L is the deprotonated form of 4-chloro-2-((pyridin-2-ylmethylene)amino)phenol, have been synthesized and characterized by elemental analysis, IR and UV-Vis spectra. The structures of the complexes were further confirmed by single crystal X-ray diffraction. The Cu ions in 1 and 2 are in square planar coordination. The Ni and Zn ions in 3 and 4 are in octahedral coordination. The coordination of the Zn ions in centrosymmetric complex 5 is between square pyramidal and trigonal bipyramidal. The copper complexes have excellent urease inhibitory activity. [ABSTRACT FROM AUTHOR]

Two new homo-tetranuclear nickel(II) complexes, [Ni4(L1)4(CH3OH)4] (1) and [Ni4(L2)4(CH3OH)4] (2), and two new hetero-tetranuclear nickel(II)-zinc(II) complexes, [Ni2Zn2I2(L1)2(μ1,1-N3)2]CH3OH (3) and [Ni2Zn2Cl2(L2)2(μ1,1-N3)2]H2O (4), where L1is the deprotonated form of 4-tert-butyl-2-(3-ethoxy-2-hydroxybenzylideneamino)phenol (HL1) and L2 is the deprotonated form of 4-tert-butyl-2-(2-hydroxy-3-methoxybenzylideneamino)phenol (HL2), have been synthesized. Structures of the complexes were characterized by elemental analysis, IR and UV-Vis spectroscopy, and single crystal X-ray diffraction. The Ni ions in the complexes are in octahedral coordination, and the Zn ions are in distorted square pyramidal coordination. The compounds were evaluated for their antibacterial (Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas fluorescens) and antifungal (Candida albicans and Aspergillus niger) activities by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) method. [ABSTRACT FROM AUTHOR]

An end-on azido-bridged dinuclear copper(II) complex, [Cu2L2(μ1,1-N3)2], where L is the deprotonated form of N-(2-hydroxy-4-methoxybenzylidene)picolinamide (HL), has been prepared by the reaction of 5-methoxy-2-[(pyridin-2-ylmethylimino)methyl]phenol (HL′) with copper bromide and sodium azide in methanol. The structure of the complex was characterized by elemental analysis, IR and UV–vis spectra, and single crystal X-ray diffraction. The complex possesses crystallographic inversion symmetry, with the two Cu ions (3.36 Å) bridged by two end-on azido bridges. Each Cu ion is in a square pyramidal coordination. The original ligand HL′ was unexpectedly oxidized to HL under mild conditions during preparation of the complex. The complex has excellent urease inhibitory activity. [ABSTRACT FROM AUTHOR]

Two copper(II) complexes, [Cu2(L1)2]·2H2O (1) and [Cu3(L1)2(NCS)2] (2), and two nickel(II) complexes, [NiL2(NCS)] (3) and [Ni(L2)2(NCS)]·CH3OH (4), were prepared from the fluorine substituted Schiff bases N,N'-bis(4-fluorosalicylidene)-1,2-diaminopropane (H2L1) and 4-fluoro-2-[(2-isopropylaminoethylimino)methyl]phenol (HL2), respectively. The compounds were characterized by physico-chemical methods. Structures of the complexes were further confirmed by single crystal X-ray diffraction. The Cu ions in 1 are square pyramidal, and in 2 are square planar and octahedral. The Ni ion in 3 is square planar, and in 4 is octahedral. All the complexes have effective Jack bean urease inhibitory activities. Complex 1 has the most effective activity, with an IC50 value of 2.1 ± 1.3 μmol L−1. [ABSTRACT FROM AUTHOR]

Urease catalyzes the decomposition of urea into ammonia, which has harmful effects on both human health and fertile soil. Aiming at exploring novel urease inhibitors, a series of hydrazone compounds and their CoIII, CuII, NiII, and ZnII complexes were prepared from 4-methoxy-N'-(pyridin-2-ylmethylene)benzohydrazide (HL). They are [CoClL(NCS)] (1), [CoL2]·Cl·CH3OH·H2O (2), [CuL(NCNCN)]n·nCH3OH (3), [NiL(HL)]·ClO4·CH3OH (4) and [ZnClL(OH2)]·CH3OH (5). The compounds were characterized by physico-chemical methods. Structures of the complexes were further confirmed by single crystal X-ray diffraction. The metal ions in 1, 3, and 5 display square pyramidal coordination and 2 and 4 display octahedral coordination. The inhibitory effects of the compounds on Jack bean urease were evaluated. The results showed that 3 has effective urease inhibitory activity, with IC50 value of (7.3 ± 1.0) μmol L−1. [ABSTRACT FROM AUTHOR]

Two new oxovanadium(V) complexes, [VOL(mat)] (1) and [VOL(Et‐mat)] (2) (mat = maltolate, Et‐mat = ethyl maltolate), where L is the dianionic form of N′‐(3‐ethoxy‐2‐hydroxybenzylidene)‐3‐hydroxy‐4‐methoxybenzohydrazide (H2L), were prepared and characterized by elemental analysis, IR, UV/Vis, and 1H NMR spectra. The structures of the compounds were further confirmed by single‐crystal X‐ray diffraction. The hydrazone ligand coordinates to the V atoms through the phenolate oxygen, imino nitrogen, and enolate oxygen. The maltolate and ethyl maltolate ligands coordinated to the V atoms through the carbonyl oxygen and deprotonated hydroxyl oxygen. The V atom in each complex is in octahedral coordination. The complexes were administered intragastrically to both normal and alloxan‐diabetic mice for two weeks. The biological activity results show that the complexes at doses of 10.0 and 20.0 mg V·kg–1, can significantly decrease the blood glucose level in alloxan‐diabetic mice, but the blood glucose level in the treated normal mice was not altered. [ABSTRACT FROM AUTHOR]

A series of copper(II) complexes, [CuCl 2 (HL 1 )]·CH 3 OH ( 1 ), [CuL 2 (ONO 2 )] ( 2 ), [CuBrL 2 ] ( 3 ) and [CuL 3 (NCS)(CH 3 OH)] ( 4 ) were prepared from 3,5-dihydroxy- N ′-(pyridin-2-ylmethylene)benzohydrazide (HL 1 ), 2-hydroxy- N ′-(1-(pyridin-2-yl)ethylidene)benzohydrazide (HL 2 ) and 4-methoxy- N ′-(pyridin-2-ylmethylene)benzohydrazide (HL 3 ). The compounds were characterized by physico-chemical methods. Structures of HL 1 and the complexes were further confirmed by single crystal X-ray diffraction. The metal atoms in complexes 1 and 4 display square pyramidal coordination, in complexes 2 and 3 display square planar coordination. The inhibitory effects of the compounds on Jack bean urease were evaluated. The results showed that the hydrazone HL 1 and complexes 1 and 4 have significant urease inhibitory activities, with IC 50 values of 8.2 ± 1.5, 6.3 ± 1.7, and 3.1 ± 1.2 μmol·L −1 , respectively. Complexes 2 and 3 show medium urease inhibitory activities, with IC 50 values of 35.7 ± 3.1, and 41.5 ± 2.7 μmol·L −1 , respectively. Molecular docking study of the compounds with Jack bean urease was performed to study the probable binding modes. The compounds with effective urease inhibitory activities anchor well in the active center of the urease and extend to the entrance of the binding pocket by interacting with its key amino acid residues. The results endorse that the hydrazone compound HL 1 and complexes 1 and 4 may serve as structural templates for the design and development of novel urease inhibitors. [ABSTRACT FROM AUTHOR]

Urease inhibitors can counteract the negative effects of urease. In this paper, three new copper(II) complexes derived from 3-methyl- N ′-(pyridin-2-ylmethylene)benzohydrazide (HL) were prepared. They are [CuBr(CH 3 OH)L] ( 1 ), [Cu(CH 3 OH)L(NCS)] ( 2 ), and [CuL(HL)]·ClO 4 ( 3 ). The complexes were characterized by infrared and UV–Vis spectra, and single crystal X-ray determination. The Cu atoms in complexes 1 and 2 display square pyramidal coordination, and in complex 3 the Cu atom displays octahedral coordination. Complex 1 shows effective urease inhibitory activity, with IC 50 value of 1.46 ± 0.83 μM. Molecular docking study of the complexes with Jack bean urease was performed. [ABSTRACT FROM AUTHOR]

Two new copper(II) complexes, [CuL(HL)]·ClO4 (1) and [Cu2Br2L2]·0.85H2O (2), where L is the monoanionic form of 4-tert-butyl-N′-(1-(pyridin-2-yl)ethylidene)benzohydrazide (HL), have been prepared. The complexes were characterized by infrared and UV–vis spectra, and single crystal X-ray diffraction. Complex 1 is a mononuclear copper(II) species and 2 is a bromido-bridged dinuclear copper(II) species. The Cu ion in 1 is in an octahedral coordination mode and that in 2 is trigonal-bipyramidal. The Jack bean urease inhibitory assay indicated that 2 is active, with IC50 value of 20.6 ± 2.3 μmol L−1, while 1 is inactive. Molecular docking of 2 with Jack bean urease was studied. [ABSTRACT FROM AUTHOR]

Two new mononuclear nickel(II) complexes, [NiL¹(NCS)] (1) and [Ni(L²)2]¢2NO3 (2), where L¹ is the deprotonated form of 1-[(2-ethylaminoethylimino)methyl]-naphthalen-2-ol, and L² is the zwitterionic form of 2,4-dibromo-6-[(2-ethylaminoethylimino)methyl]phenol, have been prepared and characterized by physicochemical methods and single-crystal X-ray diffraction. The Ni atoms in both complexes are in square planar coordination. The Ni atom in 1 is coordinated by one phenolate O, one imine N, and one amine N atom of L¹ ligand and one thiocyanate N atom. The Ni atom in 2 is coordinated by two phenolate O and two imine N atoms of two L² ligands. Crystals of the complexes are stabilized by hydrogen bonds. Thermal stability of the complexes has been studied. The Schiff bases and the complexes showed potent antibacterial activities. [ABSTRACT FROM AUTHOR]

Two new oxidovanadium(V) complexes with the general formula [VOL(bha)], where L represents the deprotonated hydrazone ligands 2-hydroxy-N'-(4-methoxybenzylidene)naphthohydrazide (H2L1) for1andN'-(2-chlorobenzylidene)-2-hydroxynaphthohydrazide (H2L2) for2, and bha represents the monoanionic form of benzohydroxamic acid (Hbha), have been prepared and characterized by elemental analysis, infrared and UV-Vis spectra, and thermal behavior. Structures of the complexes have been further determined by single-crystal X-ray diffraction. The V atoms in the complexes are coordinated by the three donor atoms of the hydrazone ligands, the oxygen atoms of the benzohydroxamate ligands, and oxido oxygen atoms, constituting octahedral coordination spheres. [ABSTRACT FROM AUTHOR]

A new hydrazone 4-bromo-N′-(2-hydroxy-5-methoxybenzylidene)benzohydrazide (HL) was prepared and characterized by infrared and UV–vis spectra, as well as single-crystal X-ray diffraction. With the hydrazone as ligand, two new copper(II) complexes were prepared, [Cu2L2(NCS)2]·4H2O (1) and [CuBrL]·CH3OH (2). The complexes were characterized by infrared and UV–vis spectra, and single-crystal X-ray diffraction. The Cu in1is in a square pyramidal coordination geometry and that in2is in a square planar coordination geometry. The two complexes show effectiveJack beanurease inhibitory activity, with IC50values of 23.5 and 2.7 μM, respectively. A molecular docking study of2with the urease was performed. The relationship between the structure and urease inhibitory activity indicated that copper complex with square planar coordination is a better model for urease inhibition. [ABSTRACT FROM AUTHOR]

A dicyanoamide-bridged polymeric copper(I/II) complex, [CuII(sal)(bipy) CuI(dca)2]n, was prepared by reaction of 5-methylchlorosalicylaldehyde (Hsal), 2,2'-bipyridine (bipy), sodium dicyanoamide (Nadca), and copper perchlorate in methanol. The complex was characterized by elemental analyses, infrared and electronic spectroscopy, and single-crystal X-ray determination. CuII has a square pyramidal coordination, and CuI has triangular coordination. The complex showed high urease inhibitory activity with IC50 value of 0.16 ± 0.23 μM. [ABSTRACT FROM AUTHOR]

A new centrosymmetric dinuclear oxovanadium(V) complex, [V2O2(μ-O)2L2], was prepared by the reaction of [VO(acac)2] (where acac = acetylacetonate) with the Schiff base ligand 2-bromo-4-chloro-6-((2-(ethylamino)ethylimino)methyl)phenol (HL) in methanol. Crystal and molecular structure of the complex were determined by elemental analysis, infrared and1H NMR spectra and single-crystal X-ray diffraction. The V···V distance is 3.105(1) Å. The V atoms in the complex are in octahedral coordination, with the phenolate oxygen, imino nitrogen, and amino oxygen of the Schiff base ligand, and one bridging oxo oxygen in the equatorial plane, and with one oxo oxygen and one bridging oxo oxygen in the two axial positions. Thermal stability of the complex was studied. [ABSTRACT FROM PUBLISHER]

Two vanadium(V) complexes, [VOL1L'] and [VOL2L']·0.5CH3OH, were prepared by the reaction of [VO(acac)2] (where acac = acetylacetonate) and benzohydroxamic acid (HL') withN'-(3-bromo-2-hydroxybenzylidene)-2-methylbenzohydrazide (H2L1) andN'-(3-bromo-2-hydroxybenzylidene)-2-methoxybenzohydrazide (H2L2), respectively, in methanol. Molecular component and structures of the complexes were determined by elemental analysis,1H NMR, IR and UV spectra. Single crystal structures of the complexes were determined by X-ray diffraction. The V atoms are in octahedral coordination. [ABSTRACT FROM PUBLISHER]

A new oxovanadium(V) complex, [N'-(3-ethoxy-2-hydroxybenzylidene)-4-fluorobenzohydrazido](quinolin-8-olato)oxovanadium(V), [VO(EFH)(QN)], where EFH is the anion ofN'-(3-ethoxy-2-hydroxybenzylidene)-4-fluorobenzohydrazide, and QN is the anion of 8-hydroxyquinoline, was prepared and characterized by elemental analysis, infrared spectra, thermal analysis and single-crystal X-ray diffraction. The complex crystallizes in the monoclinic space groupP21/n, with unit cell dimensionsa= 8.3921(4) Å,b= 28.200(1) Å,c= 10.0237(5) Å, β = 102.394(1)°,V= 2316.9(2) Å3,Z= 4, GOOF = 1.101,R1= 0.0464, andwR2= 0.1081. The V atom is coordinated by the three donor atoms of EFH and two donor atoms of QN, as well as one oxo oxygen group, forming an octahedral coordination. [ABSTRACT FROM AUTHOR]

New oxidovanadium(V) complexes, [VOL1(bzh))]·H2O (1) and [VOL2(bzh))] (2), were prepared by the reaction of [VO(acac)2] (where acac?=?acetylacetonate) and benzohydroxamic acid (Hbzh) withN?-(5-bromo-2-hydroxybenzylidene)-3-methylbenzohydrazide (H2L1) andN?-(5-bromo-2-hydroxybenzylidene)-4-methylbenzohydrazide (H2L2), respectively, in methanol. Structures of the complexes were determined by elemental analysis, infrared and UV–vis spectra. Single crystal structures of the complexes were determined by X-ray diffraction. Vanadiums have octahedral coordination. Thermal stability and the inhibition of urease of the complexes were studied. [ABSTRACT FROM PUBLISHER]

Two new oxovanadium(V) complexes, [VOL1(OEt)(EtOH)] (1) and [VOL2(OMe)(MeOH)] (2), were prepared by reaction of [VO(acac)2] (where acac = acetylacetonate) withN′-(3-bromo-2-hydroxybenzylidene)-4-methylbenzohydrazide (H2L1) in ethanol andN′-(3-bromo-2-hydroxybenzylidene)-4-methoxybenzohydrazide (H2L2) in methanol, respectively. Crystal and molecular structures of the complexes were determined by elemental analysis, infrared spectra, and single-crystal X-ray diffraction. The V ions have octahedral coordination. Thermal stability and the inhibition of urease of the complexes were studied. [ABSTRACT FROM AUTHOR]

Two new mononuclear Schiff base zinc(II) complexes with the formula [ZnXL]·BF4 [X = Cl for (1) and X = Br for (2); L = N,N′-bis(1-pyridin-2-ylethylidene)propane-1,2-diamine] have been prepared. The complexes have been characterized by physicochemical methods and single-crystal X-ray determination. Each compound contains a mononuclear zinc(II) complex cation and a disordered fluoroborate anion. The zinc(II) atoms in both complexes are five-coordinated by the four N atoms of L, and by one halide atom, forming a square-pyramidal coordination. The Schiff base ligand and the zinc(II) complexes showed potent antibacterial activities. [ABSTRACT FROM AUTHOR]

Three cobalt(III), nickel(II), and manganese(III) complexes, [Co(L1)(N3)] (1), [Ni(L2)]·ClO4 (2), and [MnL3(NCS)(OH2)] (3), where L1, L2, and L3 are the deprotonated forms of 2,2′-[1,1′-(3-azapentane-1,5-diyldinitrilo)diethyl]diphenol (H2L1), 2-{1-[2-(2-aminoethylamino)ethylimino]ethyl}phenol (HL2), and N,N’-ethylene-bis(2-hydroxyacetophenoneimine) (HL3), respectively, have been prepared and structurally characterized by physicochemical methods and single-crystal X-ray diffraction. Even though the ligands in the complexes are different, they were prepared with the same starting material, viz. 2-acetylphenol and diethylenetriamine. The metal salts and pseudohalide ligands used in the preparation of the complexes can influence the types of the Schiff-base ligands. [ABSTRACT FROM AUTHOR]

Two new dioxovanadium(V) complexes, [VO2L1]2 (1) and [VO2L2] (2), where L1 and L2 are the deprotonated forms of 4-chloro-2-[(2-isopropylaminoethylimino)methyl]phenol and 4-chloro-2-[(2-morpholin-4-ylethylimino)methyl]phenol, respectively, have been synthesized and characterized by IR spectra and single crystal X-ray diffraction. Complex (1) is a centrosymmetric dinuclear dioxovanadium complex, with the V atom six-coordinate in an octahedral geometry. The V⋅⋅⋅V distance is 3.224(2) Å. Complex (2) is a mononuclear dioxovanadium complex, with the V atom five-coordinate in a distorted square pyramidal geometry. The steric effects of the terminal groups in the Schiff base ligands can influence the structures of the complexes. [ABSTRACT FROM AUTHOR]

The cubane-type structure is a typical representative of tetranuclear coordination compounds. In this work, two anionic Schiff-base ligands, (L1)2− and (L2)2−, each offering an O^N^O coordination pocket, ligate four NiII ions into a [Ni4O4] cubane core. The ligands are H2L1 = 2−[[(3-ethoxy-2−hydroxyphenyl) methylene]amino]benzenemethanol and H2L2 = 2−[[(5-fluoro-2−hydroxyphenyl)methylene]amino]benzenemethanol. In both compounds, [Ni4(L1)4(EtOH)4] (1) and [Ni4(L2)4(MeOH)4] (2), alkoxy oxygens of the ligands act in a bridging μ3-O binding mode. Magnetic susceptibility and magnetization data for compounds 1 and 2 are presented. The Ni–O–Ni bond angles of the cubane core determined from single crystal X-ray diffraction data play a key role for a magneto-structural correlation. Dominant intracube ferromagnetic behavior is observed, and the coupling parameters were determined for both compounds, leading to nonzero spin ground states in accordance with the broadly accepted bond angle guideline. [ABSTRACT FROM AUTHOR]

[Display omitted] Five novel NiII-ZnII complexes were prepared from the Schiff base 2-(3-ethoxy-2-hydroxybenzylideneamino)-4-methylphenol. The complexes have been characterized by elemental analysis, IR, UV–Vis spectra. Molecular structures of the complexes have been determined by single crystal X-ray determination. The compounds were evaluated for their antibacterial activities on Bacillus subtilis , Staphylococcus aureus , Escherichia coli and Pseudomonas fluorescens , and antifungal activities on Candida albicans and Aspergillus niger , and gave interesting results. Molecular nanoclusters comprising heterometallic Ni-Zn cores are an interesting class of compounds. In this paper, five novel NiII-ZnII complexes [Ni 2 Zn 2 ClL 3 (HL) 3 ]·0·.25H 2 O (1), [Ni 2 Zn 2 BrL 3 (HL) 3 ]·0·.25H 2 O (2), [Ni 2 Zn 2 Br 2 L 2 (N 3) 2 (MeOH) 2 ]·2MeOH (3), [Ni 2 Zn 2 I 2 L 2 (N 3) 2 (MeOH) 2 ]·2MeOH (4), and [Ni 2 Zn 2 I 2 L 2 (N 3) 2 (DMF) 2 ] (5), were prepared from the Schiff base 2-(3-ethoxy-2-hydroxybenzylideneamino)-4-methylphenol (H 2 L). The complexes have been characterized by elemental analysis, IR, UV–Vis spectra. Molecular structures of the complexes have been determined by single crystal X-ray determination. In complexes 1 and 2 , three of the Schiff bases coordinate to the metal atoms via ether oxygen, imino nitrogen and two phenolate oxygen atoms, while the fourth one coordinates through ether oxygen, imino nitrogen and one phenolate oxygen atoms. In complexes 3 , 4 and 5 , all the donor atoms in the Schiff base ligands participate in coordination. The Ni and Zn atoms in the complexes are in octahedral and trigonal bipyramidal coordination, respectively. The anions of the metal salts and the azide anion, as well as methanol and DMF molecules furnish the coordination sphere. The compounds were evaluated for their antibacterial activities on Bacillus subtilis , Staphylococcus aureus , Escherichia coli and Pseudomonas fluorescens , and antifungal activities on Candida albicans and Aspergillus niger. Interestingly, the complexes have effective activities against Bacillus subtilis and Staphylococcus aureus. [ABSTRACT FROM AUTHOR]

[Display omitted] • A new Schiff base was prepared. • Four new Ni-Ni and Ni-Ln complexes were prepared. • The Schiff base the complexes have been characterized by single crystal X-ray diffraction. • The complexes have effective antimicrobial activities. Molecular nanoclusters comprising a heterometallic 3 d -4 f stoichiometry are an interesting class of compounds. In this paper, a chloro-containing Schiff base 4-chloro-2-(2-hydroxy-3-ethoxybenzylideneamino)phenol (H 2 L) was prepared by condensation reaction of 3-ethoxysalicylaldehyde with 2-amino-4-chlorophenol in methanol. The Schiff base is predisposed to chelate within a cluster core both 3 d and 4 f metal ions. Reaction of H 2 L with nickel salts afforded a tetranuclear NiII complex [Ni 4 L 4 (MeOH) 4 ] (1), while with nickel salts and lanthanide(III) nitrate three tetranuclear NiII-LnIII complexes [Ni 2 Eu 2 L 4 (NO 3) 2 (DMF) 2 ] (2), [Ni 2 Er 2 L 4 (NO 3) 2 (DMF) 2 ] (3), [Ni 2 Tb 2 L 4 (CH 3 COO) 2 (DMF) 2 ]·4DMF (4) were obtained. H 2 L and the complexes have been characterized by elemental analysis, IR, UV–Vis spectra. H 2 L has also been characterized by 1H and 13C NMR spectra. Molecular structures of the compounds have been determined by single crystal X-ray determination. In the complexes, the Schiff base ligands coordinate to the metal atoms via ether oxygen, imino nitrogen and two phenolate oxygen atoms. All the Ni atoms in the complexes are in octahedral coordination. The rare earth metal atoms are eight coordinated by the phenolate and ether oxygen of the Schiff base ligands, and anionic and solvent oxygen atoms, forming square antiprismatic coordination. The compounds were evaluated for their antibacterial activities on Bacillus subtilis , Staphylococcus aureus , Escherichia coli and Pseudomonas fluorescens , and antifungal activities on Candida albicans and Aspergillus niger , and gave interesting results. [ABSTRACT FROM AUTHOR]

[Display omitted] • Six new copper(II) and nickel(II) complexes were prepared. • The complexes have been characterized by single crystal X-ray diffraction. • The complexes are versatile polynuclear compounds. • The copper complexes have effective urease inhibitory activity. Four new copper(II) and two new nickel(II) complexes, [Cu 2 (μ-Br) 2 L 2 ] (1), [CuL(μ 1,3 -NCS)] n (2), [Cu 2 L 2 (μ 1,3 -N 3) 2 ] (3), [Cu 3 Cl 2 (μ-Cl) 2 L 2 ] (4), [Ni 3 L 2 (μ 2 -η1:η1-OAc) 2 (μ 2 -η2:η1-OAc) 2 ]·2CH 3 OH (5) and [NiL(μ 2 -1,5-dca)(OH 2)] n (6), where L is the deprotonated form of 5-bromo-2-(((2-pyrrolidin-1-yl)ethyl)imino)methyl)phenol, dca is dicyanoamide, were synthesized and characterized by elemental analyses, infrared and electronic spectroscopy, and single crystal X-ray determination. The Cu atoms in complexes 1 – 3 and the outer two Cu atoms in complex 4 are in square pyramidal coordination, while the central Cu atom in complex 4 is in square planar geometry. The Ni atoms in complexes 5 and 6 are in octahedral coordination. The co-ligands bromide, thiocyanate, azide, chloride, acetate and dicyanoamide are interesting bridging groups in the construction of the polynuclear complexes with versatile structures. The urease inhibition assay indicates that the copper complexes have effective activities. [ABSTRACT FROM AUTHOR]

A new acetohydroxamate coordinated oxidovanadium(V) complex derived from the pyridinohydrazone ligand 2′-(2-hydroxy-4-methoxybenzylidene)nicotinohydrazide (H 2 L), was prepared and characterized by elemental analysis, IR, UV–vis and 1H NMR spectra, and single crystal X-ray diffraction. Thermal analysis of the complex was performed. The V atom is in octahedral coordination. The complex has remarkable inhibitory activity on Jack bean urease with IC 50 value of 14.9 μmol·L−1. The interaction mode of the complex with the urease was studied by molecular docking technique. Unlabelled Image • A new acetohydroxamate coordinated oxidovanadium(V) complex was prepared. • The complex has been characterized by single crystal X-ray diffraction. • The complex shows strong urease inhibitory activity. [ABSTRACT FROM AUTHOR]

A series of new ZnII, CoII/III and NiII complexes derived from reduced Schiff base were prepared and characterized. The cobalt complex and the nickel complex have effective urease inhibitory activities. Molecular docking study of the complexes was studied. A series of new ZnII, CoII/III and NiII complexes derived from reduced Schiff base 6,6′-((propane-1,3-diylbis(azanediyl))bis(methylene))bis(2-ethoxyphenol) (H 2 L), [Zn 3 L 2 (N 3) 2 ] (1), [Co 2 L(N 3) 2 (CH 3 COO)]·CH 3 OH (2) and [Ni(HL)(OH 2)(CH 3 OH)]·ClO 4 (3), were prepared and characterized by physico-chemical methods. Crystal structures of the complexes were determined by single crystal X-ray diffraction. Complex 1 is a trinuclear zinc(II) compound. Complex 2 is a dinuclear cobalt(II/III) compound. Complex 3 is a mononuclear nickel(II) compound. The cobalt complex and the nickel complex have effective urease inhibitory activities, with IC 50 values of 19.8 and 11.6 μmol·L−1, respectively. However, the zinc complex 1 has no such activity. Molecular docking study of complexes 2 and 3 with the active center of Jack bean urease was studied. [ABSTRACT FROM AUTHOR]

Two new maltolate- and ethylmaltolate-coordinated oxidovanadium(V) complexes with aroylhydrazone ligand were prepared. The aroylhydrazone and the complexes have been characterized by elemental analysis, IR, UV–Vis and NMR spectra. Single crystal structures of the aroylhydrazone and the complexes have been determined. The complexes have effective insulin-like activity on alloxan-diabetic mice. Two new oxidovanadium(V) complexes, [VOLL1] and [VOLL2], where L is the dianionic form of N ′-(3-ethoxy-2-hydroxybenzylidene)-3-methylbenzohydrazide (H 2 L), L1 is maltolatel, and L2 is ethylmaltolate, have been prepared. Both H 2 L and the complexes have been characterized by elemental analysis, IR, UV–Vis and NMR spectra. The structures of the compounds were further confirmed by single crystal X-ray diffraction. The aroylhydrazone ligand coordinates to the V atoms through the phenolate oxygen, imino nitrogen and enolate oxygen. The maltolate and ethylmaltolate ligands coordinated to the V atoms through the carbonyl oxygen and deprotonated hydroxyl oxygen. The V atom in each complex is in octahedral coordination. The complexes were administered intragastrically to both normal and alloxan-diabetic mice. The biological activity results show that the complexes at doses of 10.0 and 20.0 mg V·kg−1, can significantly decrease the blood glucose level in alloxan-diabetic mice, but the blood glucose level in the treated normal mice was not altered. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • Three new dioxomolybdenum(VI) complexes are synthesized. • These complexes are tested as catalysts for cyclohexane oxidation. • Sebacic acid and FeCl 3 as acid auxiliaries are effective to promote the reaction. Abstract Three new dioxomolybdenum (VI) complexes, [MoO 2 L1(MeOH)] (1), [MoO 2 L2(MeOH)] (2) and [MoO 2 L3(H 2 O)]·EtOH (3), where L1, L2 and L3 are the dianionic form of N′-(2-hydroxybenzylidene)-3-methylbenzohydrazide, 4-bromo-N′-(2-hydroxybenzylidene)benzohydrazide and 2-bromo-N′-(2-hydroxy benzylidene)benzohydrazide, respectively, have been prepared and characterized by IR, UV–Vis and NMR spectra, as well as single crystal X-ray diffraction. The Mo atoms in the complexes are in octahedral coordination, with the ONO donor set of the hydrazone ligands, O atoms of the solvents, and two oxo groups. Crystals of the complexes are stabilized by hydrogen bonds of types O H⋯N and O H⋯O. Moreover, the catalytic properties of complexes 1 – 3 are compared in cyclohexane oxidation. It was found that sebacic acid and FeCl 3 could promote the catalytic activities of the complexes. [ABSTRACT FROM AUTHOR]

Abstract A trinuclear copper(II) complex, [Cu 3 L 2 ]·2ClO 4 ·2CH 3 CN, with the reduced Schiff base ligand 2,2′-((propane-1,3-diylbis(azanediyl))bis(methylene))diphenol (H 2 L) was prepared. The complex was characterized by elemental analysis, IR and UV–Vis spectra, and single crystal X-ray diffraction. The ligand coordinates to the Cu atoms through the amino nitrogen and phenolate oxygen, giving square planar geometry. The ligand and the complex were tested for their Jack bean urease inhibitory activities. The IC 50 value of the complex on the urease inhibition is 1.6 ± 1.2 μmol·L−1. Molecular docking study of the complex was performed to study the inhibition. Graphical abstract Unlabelled Image Highlights • A novel trinuclear copper(II) complex was prepared. • The complex has been characterized by single crystal X-ray diffraction. • The complex shows strong urease inhibitory activity. • This is the first example of urease inhibition with reduced Schiff base complex. [ABSTRACT FROM AUTHOR]

[Display omitted] • Two new molybdenum complexes were prepared. • The Schiff base ligands and acetylacetonate underwent a Mannich nucleophilic addition reaction with the assistance of the Mo atom. • The complexes have been characterized by single crystal X-ray diffraction. • The complexes have effective antimicrobial activities. Reaction of bis(acetylacetonato)dioxomolybdenum(VI) with 4-fluoro-2-((pyridin-2-ylmethylene)amino)phenol and 3-methyl-2-((pyridin-2-ylmethylene)amino)phenol, respectively in methanol afforded two new molybdenum complexes [MoO 2 L1] and [MoO 2 L2], where L1 and L2 are the dianionic form of 3-(((5-fluoro-2-hydroxyphenyl)amino)(pyridin-2-yl)methyl)pentane-2,4-dione (H 2 L1) and 3-(((2-hydroxy-6-methylphenyl)amino)(pyridin-2-yl)methyl)pentane-2,4-dione (H 2 L2). Both complexes have been characterized by elemental analysis, IR, UV–Vis, 1H and 13C NMR spectra. Molecular structures of the complexes have been determined by X-ray crystallography. In the complexes, the ligands coordinated to the Mo atoms via pyridine nitrogen, amino nitrogen, phenolate oxygen, and enolate oxygen atoms. The octahedral coordination of the Mo atoms is furnished by two oxido oxygen atoms. The complexes were evaluated for their antibacterial activities on Bacillus subtilis , Staphylococcus aureus , Escherichia coli and Pseudomonas fluorescens , and antifungal activities on Candida albicans and Aspergillus niger , and gave interesting results. [ABSTRACT FROM AUTHOR]

Four new nickel(II), cadmium(II), copper(II) and iron(III) complexes were prepared. The structures of the complexes were characterized by single crystal X-ray diffraction. The Jack bean urease inhibitory assay indicated that the copper complex has remarkable activity. [Display omitted] Four new nickel(II), cadmium(II), copper(II) and iron(III) complexes, [Ni 3 (L1) 2 (μ 2 - η 1: η 1-CH 3 COO) 2 ] (1), [Cd 2 (L1) 2 (CH 3 OH) 2 ] (2), [Cu(L2)] (3) and [Fe 2 (L3) 2 (μ 2 -OCH 3) 2 ] (4), where L1, L2 and L3 are the dianionic form of N,N' -bis(5-fluorosalicylidene)-1,3-propanediamine (H 2 L1), N,N' -bis(3,5-difluorosalicylidene)-1,3-propanediamine (H 2 L2) and N,N' -bis(4-fluorosalicylidene)-1,3-propanediamine (H 2 L3), respectively, were prepared. The compounds have been characterized by physico-chemical methods. The structures of the metal complexes were also confirmed by single crystal X-ray diffraction. The Ni atoms in complex 1 are in square pyramidal and octahedral coordination environments. The Cd atoms in complex 2 are in an octahedral coordination environment. The Cu atom in complex 3 is in a tetrahedrally distorted square planar coordination environment. The Fe atoms in complex 4 are in an octahedral coordination environment. The Jack bean urease inhibitory assay indicated that the copper complex displays good activity. [ABSTRACT FROM AUTHOR]

A series of new copper(II) complexes were prepared. They are [CuL 1 (NCS)] ( 1 ), [CuClL 1 ]·CH 3 OH ( 2 ), [CuClL 2 ]·CH 3 OH ( 3 ), [CuL 3 (NCS)]·CH 3 OH ( 4 ), [CuL 4 (NCS)]·0.4H 2 O ( 5 ), and [CuL 5 (bipy)] ( 6 ), where L 1 , L 2 , L 3 and L 4 are the deprotonated form of N ′-(2-hydroxybenzylidene)-3-methylbenzohydrazide, 4-bromo- N ′-(2-hydroxy-5-methoxybenzylidene)benzohydrazide, N ′-(2-hydroxy-5-methoxybenzylidene)-3-methylbenzohydrazide and 2-chloro- N ′-(2-hydroxy-5-methoxybenzylidene)benzohydrazide, respectively, L 5 is the dianionic form of N ′-(2-hydroxybenzylidene)-3-methylbenzohydrazide, and bipy is 2,2′-bipyridine. The complexes were characterized by infrared and UV–Vis spectra and single crystal X-ray diffraction. The Cu atoms in complexes 1 , 2 , 3 , 4 and 5 are coordinated by the NOO donor set of the aroylhydrazone ligands, and one Cl or thiocyanate N atom, forming square planar coordination. The Cu atom in complex 6 is in a square pyramidal coordination, with the NOO donor set of L 1 , and one N atom of bipy defining the basal plane, and with the other N atom of bipy occupying the apical position. Complexes 1 , 2 , 3 , 4 and 5 show effective urease inhibitory activities, with IC 50 values of 5.14, 0.20, 4.06, 5.52 and 0.26 μM, respectively. Complex 6 has very weak activity against urease, with IC 50 value over 100 μM. Molecular docking study of the complexes with the Helicobacter pylori urease was performed. The relationship between structures and urease inhibitory activities indicated that copper complexes with square planar coordination are better models for urease inhibition. [ABSTRACT FROM AUTHOR]

A series of new cobalt(III) complexes were prepared. They are [CoL 1 (py) 3 ]·NO 3 ( 1 ), [CoL 2 (bipy)(N 3 )]·CH 3 OH ( 2 ), [CoL 3 (HL 3 )(N 3 )]·NO 3 ( 3 ), and [CoL 4 (MeOH)(N 3 )] ( 4 ), where L 1 , L 2 , L 3 and L 4 are the deprotonated form of N ′-(2-hydroxy-5-methoxybenzylidene)-3-methylbenzohydrazide, N ′-(2-hydroxybenzylidene)-3-hydroxylbenzohydrazide, 2-[(2-dimethylaminoethylimino)methyl]-4-methylphenol, and N , N ′-bis(5-methylsalicylidene)- o -phenylenediamine, respectively, py is pyridine, and bipy is 2,2′-bipyridine. The complexes were characterized by infrared and UV–Vis spectra, and single crystal X-ray diffraction. The Co atoms in the complexes are in octahedral coordination. Complexes 1 and 4 show effective urease inhibitory activities, with IC 50 values of 4.27 and 0.35 μmol L −1 , respectively. Complex 2 has medium activity against urease, with IC 50 value of 68.7 μmol L −1 . While complex 3 has no activity against urease. Molecular docking study of the complexes with Helicobacter pylori urease was performed. [ABSTRACT FROM AUTHOR]

Three new oxidovanadium(V) complexes with formula [VOLL′] (L = L 1 = N ′-(2-hydroxy-4-methoxybenzylidene)-4-hydroxybenzohydrazide for 1 , L = L 2 = N ′-(3-ethoxy-2-hydroxybenzylidene)pivalohydrazide for 2 , L = L 3 = 2-bromo- N ′-(3-ethoxy-2-hydroxybenzylidene)benzohydrazide for 3 , L′ = ethylmaltol), have been prepared. The complexes have been characterized by physico-chemical methods and single crystal X-ray determination. The V atom in each complex is coordinated by the NOO donor atoms of L, the OO donor atoms of L′, and one oxido group, forming octahedral coordination. The complexes were administered intragastrically to both normal and alloxan-diabetic mices for two weeks. The biological activity results show that the complexes at doses of 10.0 and 20.0 mg V·kg −1 , can significantly decrease the blood glucose level in alloxan-diabetic mices, but the blood glucose level in the treated normal mices was not altered. [ABSTRACT FROM AUTHOR]

Three new mononuclear copper(II) complexes, [CuL 1 (N 3 )] ( 1 ), [CuL 1 (NCS)] ( 2 ), and [CuL 2 (NCS)] ( 3 ), where L 1 is the monoanionic form of 5-diethylamino-2-[(pyridin-2-ylmethylimino)methyl]phenol (HL 1 ), and L 2 is the monoanionic form of 2-[1-(2-piperidin-1-ylethylimino)ethyl]phenol (HL 2 ), have been synthesized and characterized by physico-chemical methods, as well as single crystal X-ray determination. The Cu atoms in the complexes are coordinated by the donor atoms of the Schiff base ligands and nitrogen atom of the pseudohalide ligands, forming square planar geometry. The complexes showed effective urease inhibitory activities. Complex 1 showed the most urease inhibitory activity, with IC 50 value of 1.5 ± 1.1 μM. Molecular docking study of the complexes with Helicobacter pylori urease was performed. As a result, complex 1 matches well with the cavity of the active center of the urease, and forms weak interaction with residues ASP 316, LEU 318, MET 317, CYS 321, HIS 322 and ARG 328. [ABSTRACT FROM AUTHOR]

A new benzohydrazone compound N ′-(3-bromo-2-hydroxybenzylidene)-4-methoxybenzohydrazide (H 2 L) was prepared. Reaction of H 2 L and acetohydroxamic acid (HAHA) with VO(acac) 2 in methanol gave the complex [VOL(AHA)]. Both H 2 L and the oxovanadium complex were characterized by elemental analysis, IR, UV–vis and 1 H NMR spectra, and single crystal X-ray diffraction. H 2 L was also characterized by high-resolution mass spectrum. Thermal analysis of the oxovanadium complex was carried out. The benzohydrazone ligand, in its dianionic form, coordinates to V atom through the phenolate oxygen, imino nitrogen and enolate oxygen. The acetohydroxamic acid coordinates to V atom through the carbonyl oxygen and deprotonated hydroxyl oxygen. The V atom is in octahedral coordination. H 2 L, HAHA and the oxovanadium complex were tested for their urease inhibitory activities. The percent inhibition at concentration of 100 μmol·L −1 on Helicobacter pylori urease is 78% for the oxovanadium complex. The IC 50 value for the complex is 36.5 μmol·L −1 . Molecular docking study was performed to study the inhibition. [ABSTRACT FROM AUTHOR]

• Six new cobalt(II), nickel(II) and zinc(II) complexes with Schiff base ligands were prepared. • The complexes have been characterized by single crystal X-ray diffraction. • The complexes have effective antibacterial activities. A series of new cobalt(II), nickel(II) and zinc(II) complexes [Co{CoL(CH 3 COO)} 2 ] (1), [Ni{NiL(CH 3 COO)} 2 ] (2), [Zn{ZnL(CH 3 COO)} 2 ] (3), [Ni 2 ClL(μ 2 -1,5-dca)] n (4), [Zn 2 BrL(μ 1,1 -N 3)] 2 (5), [Zn 2 ClL(μ 1,1 -N 3)] 2 (6), where L is the doubly deprotonated form of N , N' -bis(4-fluorosalicylidene)-1,3-propanediamine (H 2 L), dca is dicyanoamide, were synthesized and characterized by elemental analyses, infrared and electronic spectroscopy, and single crystal X-ray determination. Complexes 1 , 2 and 3 are isostructural acetato- and phenolato-bridged trinuclear compounds. Complex 4 is a μ 2 -1,5-dca and phenolato-bridged polymeric compound. Complexes 5 and 6 are isostructural end-on azido- and phenolato-bridged tetranuclear compounds. The compounds were evaluated for their antibacterial (Bacillus subtilis , Staphylococcus aureus , Escherichia coli , and Pseudomonas fluorescens) and antifungal (Candida albicans and Aspergillus niger) activities by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) method. [ABSTRACT FROM AUTHOR]

Two novel quaternary mercury-thioarsenates(III) CsHgAsS 3 (1) and Rb 2 HgAsS 3 (SH) (2) were synthesized under solvothermal conditions by using thiophenol as a mineralizer, and compound 2 exhibits excellent photoelectric response property. • Two novel quaternary mercury-thioarsenates(III) were synthesized solvothermally. • CsHgAsS 3 possesses a unique two-dimensional (2D) layered structure. • Rb 2 HgAsS 3 (SH) exhibits excellent photoelectric response property. Two novel sulfides CsHgAsS 3 (1) and Rb 2 HgAsS 3 (SH) (2) were prepared under solvothermal conditions by using thiophenol as a mineralizer. Compound 1 crystallizes in the monoclinic space group P 2 1 / n (no. 14) [ a = 10.121(5) Å, b = 6.662(3) Å, c = 10.442(5) Å, β = 94.716(8)°, V = 701.68(60) Å3, and Z = 4]. The structure of compound 1 contains [HgS 3 ] n 4n- helical chains composed of HgS 4 tetrahedra by sharing S corners. Adjacent [HgS 3 ] n 4n- chains are connected by AsS 3 units to form two-dimensional (2D) [Hg 2 As 2 S 6 ] n 2n– layers with Cs+ ions between the anionic layers. Compound 2 crystallizes in the orthorhombic space group Pnma (no. 62) [ a = 9.2524(7) Å, b = 7.0817(5) Å, c = 14.7023(11) Å, V = 963.34(12) Å3, and Z = 4]. The structure of 2 contains one-dimensional (1D) [Hg 2 As 2 S 6 (SH) 2 ] n 4n- chains composed of HgS 4 tetrahedra and AsS 3 trigonal pyramids by corner-sharing with charge-balancing Rb+ cations between the chains. The band gap values measured by UV–vis diffuse reflectance spectra are 2.64 eV and 2.62 eV for CsHgAsS 3 (1) and Rb 2 HgAsS 3 (SH) (2), respectively. The photoelectrochemical experiments indicate that compound 2 exhibits excellent photoelectric response property. [ABSTRACT FROM AUTHOR]