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A novel terbium-containing fluorescent material, [Tb(CH3COO)2(H2O)3]Cl (1), has been prepared by a facile approach, i.e. an ultrasonic synthesis. Compound 1 has been structurally characterized via single-crystal X-ray diffraction and it crystallizes in the space group P21/n of the monoclinic system with four formula units in a cell. Compound 1 features a novel one-dimensional (1-D) chain-like structure. The 1-D chains are interconnected by hydrogen bonds to yield a 3-D supramolecular framework. Photoluminescent investigation reveals that compound 1 displays strong emission bands identified as the characteristic emissions of 5D4 → 7FJ (J = 3, 4, 5, 6) of Tb3+. [ABSTRACT FROM AUTHOR]

A novel zinc-isonicotinic acid complex [Zn(Hini)(Ini)Cl]n (1) (Hini = isonicotinic acid; Ini = deprotoned isonicotinic acid) has been synthesized via a hydrothermal reaction and structurally characterized by a single-crystal X-ray diffraction. Complex 1 crystallizes in the space group P21/c of the monoclinic system with four formula units in a cell: a = 7.654(4), b = 13.540(7), c = 14.213(3) Å, β = 122.21(1), V = 1246.2(10) ų , C12H9 ClN2 O4 Zn, Mr = 346.05, Dc = 1.844 g/cm³, S = 1.017, µ(MoKα) = 2.199 mm-1 , F(000) = 696, R = 0.0206 and wR = 0.0500. Complex 1 is characteristic of a novel one-dimensional (1-D) chain-like structure. Photoluminescence investigation reveals a strong emission, which may originate from π → π charge-transfer interaction of the isonicotinic acid ligand. [ABSTRACT FROM AUTHOR]

The 4f-3d heterometallic complexes {[Nd(L)3 (H2O) 2]2 (ZnCl4)3}n · 4nH2O (1) (L = isonicotinic acid) and {[Sm(L')3 (H2 O) 2]2 (ZnCl4)}n · 2nH2 O (2) (L' = nicotinic acid) have been obtained by hydrothermal reactions and structurally characterized by X-ray single-crystal diffractions. Both complexes feature an infinite 1-D polycationic chainlike structure. Photoluminescent investigations reveal that both complexes display totally different emissions. The emission of complex 1 is attributed to the π → π* charge-transfer interaction of the isonicotinic acid. Complex 2 exhibits emissions in a wide range, and the emissions are ascribed to the characteristic emissions of 4G5/2 6HJ (J = 5/2, 7/2, 9/2, 1 1/2) of Sm3+ ions. [ABSTRACT FROM AUTHOR]

In Situ Synthesis, Crystal Structure and Fluorescence of Zn(C5H4NCO2H) 2(H2O)2·2Cl (1) has been synthesized in situ via hydrothermal reaction and characterized by single crystal X-ray diffraction. The crystal belongs to monoclinic, space group P2 /c with a = 6.342(2), b = 10.164(3), c = 13.717(4) Å, ß = 113.62(1)°, C12H14Cl2N2O6Zn, 14 Mr = 418.54, V = 810.1(4) Å , Z = 2, Dc = 1.716 g/cm³ , S = 1.063, μ(MoKα) = 1.875 mm-1 , F(000) = 424, R = 0.0276 and wR = 0.0780. The crystal structure analysis of 1 reveals that the title compound features a structure consisting of isolated units, based on discrete chloride ions and octahedral zinc cations six-coordinated by four oxygen and two nitrogen atoms. The chloride ions and [Zn(C5H4NCO2H) 2(H2O)2]2+ moieties are interconnected by hydrogen bonding interactions to yield a 3-D supramolecular framework. Luminescent investigation reveals an emission in blue region, which may be originating from π→π* charge-transfer interaction of the pyridine-2-carboxylic acid. [ABSTRACT FROM AUTHOR]

A novel bimetallic 4f-3d metal-isonicotinic acid inorganic-organic hybrid complex [{Eu(NC5H4COOH)3(H2O)2}(1.5ZnCl4)·(2H2O)]n (1) was synthesized via a hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in the space group C2/c of the monoclinic system with eight formula units in a cell: a = 23.878(8) Å, b = 20.573(6) Å, c = 15.358(5) Å, ß = 127.276(5)°, V = 6003(3) Å3, C18H23Cl6EuN3O10Zn1.5, Mr = 904.11 g/mol, ρ = 2.001 g/cm3, S = 1.077, μ(MoKα) = 3.846 mm-1, F(000) = 3536, R = 0.0270 and wR = 0.0672. Complex 1 has a characteristic, one-dimensional polycationic chain-like structure. A photoluminescent investigation revealed that the title complex displays intense emissions in the orange and red regions. The luminescence spectra show that the red emission is stronger than the orange emission. Optical absorption spectra of 1 revealed the presence of an optical gap of 3.56 eV. [ABSTRACT FROM AUTHOR]

(4,4′-H2bipy)[CdI4]·H2O (1) has been synthesized via hydrothermal reaction and characterized by single crystal X-ray diffraction. The crystal belongs to monoclinic, space group P21/c with a = 8.3935(6), b = 24.304(2), c = 9.9388(7) Å, β = 106.230(1)°, C10H12CdI4N2O, Mr = 796.22, V = 1946.6(2) Å3, Z = 4, Dc = 2.717 g/cm3, S = 1.080, μ(MoKα) = 7.458 mm-1, F(000) = 1416, R = 0.0439 and wR = 0.1455. The crystal structure analysis of 1 reveals that the title compound features an isolated structure, based on discrete 4,4′-H2bipy moieties, lattice water molecules and tetrahedral cadmium atoms terminally coordinated by four iodine atoms. The 4,4′-H2bipy moieties and lattice water molecules are linked via hydrogen bonds. Luminescent investigation reveals a strong emission in blue region, which may be originating from π → π* charge-transfer interaction of the 4,4-H2bipy. [ABSTRACT FROM AUTHOR]

Two structural series, including seven isomorphous heterodinuclear complexes, [Ln(DMSO)4(H2O)3(μ-CN)M(CN)5]·H2O ([La-Fe] (1), [Pr-Fe] (2), [Pr-Co] (3), [Nd-Fe] (4), [Nd-Co] (5), [Sm-Fe] (6) and [Sm-Co] (7)), and seven isostructural 2-D stairlike cyano-bridged bimetallic assemblies, [Ln(DMSO)2(H2O)(μ-CN)4M(CN)2]n ([La-Fe]n (8), [Pr-Fe]n (9), [Pr-Co]n (10), [Nd-Fe]n (11), [Nd-Co]n (12), [Sm-Fe]n (13) and [Sm-Co]n (14)) (DMSO = dimethylsulfoxide), have been rationally prepared by a facile approach, a ball-milling method, and characterized by X-ray diffraction and magnetic measurements. The isomorphous structures, in conjunction with the diamagnetism of the Co3+ and La3+ ions, allow an approximation to the nature of coupling between the iron(lll) and lanthanide(lll) ions in the Ln3+-Fe3+ complexes. The Ln3+-Fe3+ interaction is ferromagnetic for the dinuclear [Pr-Fe] (2), [Nd-Fe] (4), and [Sm-Fe] (6) systems and for the 2-D [Pr-Fe]n (9), [Nd-Fe]n (11), and [Sm-Fe]n (13) assemblies. [ABSTRACT FROM AUTHOR]

The reactions of TMA4Ge4S10 (TMA=tetramethylammonium), Cu(NO3)2·3H2O and 4,4'-bipy under hydrothermal environment result in the formation of (H2bipy)2Ge4S10·(bipy)·7H2O (1), which has been structurally characterized by single crystal X-ray analysis. The 3-D structure of 1 can be viewed as an inorganic-organic hybrid supramolecular hydrogen-bonding (hydrogen bonds: O–H···O, N–H···N, C–H···O, N–H···O, and O–H···S) and π-π stacking network containing Ge4S4−10 clusters and novel [H2bipy···bipy···H2bipy] trimers. [ABSTRACT FROM AUTHOR]

The title compound, (C10H10N2)[CdBr4], was synthesized via a hydro­thermal reaction. Its structure features discrete 4,4′-bipyridinium cations and tetra­hedral [CdBr4]2− anions linked into ion pairs by single N—H⋯Br hydrogen bonds. Photoluminescent investigation reveals that the title compound displays a strong emission in the blue region, which may originate from π→π* charge-transfer inter­actions of the 4,4′-bipyridinium cations. [ABSTRACT FROM AUTHOR]

Two new lanthanide mercury halide compounds with isonicotinic acid as a ligand, namely, [Gd(μ2-HIA) 2 (μ 3-IA) H2O) 2 (HgCl2)]n(nHgCl4)·3nH2O (1) (HIA = isonicotinic acid) and {[Nd(μ2-HIA) 3 (DMF)(H2O)]n}[(Hg4Br11)n] (2HgBr2)(nBr)·nH3O (2), were synthesized with solvothermal reactions and characterized by single-crystal X-ray diffraction. Compound 1 is characterized by a two-dimensional (2-D) layer-like structure, while compound 2 features a one-dimensional (1-D) chain-like structure. The lanthanide ions in both compounds are eight coordinated and show a square antiprism geometry. The mercury ions exhibit various coordination motifs. Compound 1 exhibits ultraviolet upconversion photoluminescence emission, whereas compound 2 displays red photoluminescence. The photoluminescence emissions arise from the characteristic 4f electron intrashell transitions of the 6P7/2 → 8S7/2 of the Gd3+ ions in compound 1 and the 4F9/2 → 4I9/2, 4F7/2 + 4S3/2→ 4I9/2, 4F5/2 + 2H9/2 → 4I9/2, 4F3/2 → 4I9/2 of the Nd3+ ions in compound 2. Compound 2 has CIE (Commission Internationale de l'Eclairage) chromaticity coordinates of (0.7142, 0.2857) and its CCT (correlated color temperature) is 138,224 K. Solid-state UV/Vis diffuse reflectance spectra revealed that the semiconductor band gaps of the compounds are 3.12 eV and 3.23 eV, respectively. Elemental analyses and FT-IR spectroscopy were carried out to confirm the purity of the compounds. [ABSTRACT FROM AUTHOR]

Two new lanthanide mercury materials, [Gd(IA)3(H3O)2Hg3Br6]nCl2n (1) and [La(IA)3(H3O)2Hg3Br6]nCl2n (2) (IA = isonicotinic anion), have been prepared under solvothermal conditions and characterized by single-crystal X-ray diffraction techniques. They are isomorphic and characterized by a three-dimensional (3-D) framework structure. The lanthanide ions are bound by eight oxygen atoms to exhibit a square antiprismatic geometry. The solid-state photoluminescence experiment discovers that compound 1 shows a strong emission in the red region. Compound 1 possesses CIE (Commission Internationale de I'Éclairage) chromaticity coordinates of 0.7347 and 0.2653. Its CCT (correlated color temperature) is 6514 K. Compound 2 displays yellow photoluminescence and it has CIE chromaticity coordinates of 0.4411 and 0.5151. The CCT of compound 2 is 3633 K. Solid-state UV/Vis diffuse reflectance spectra revealed that their semiconductor band gaps are 2.16 eV and 2.85 eV, respectively. [ABSTRACT FROM AUTHOR]

The title inorganic–organic hybrid complex, [CdBr2(C10H8N2)] n, features two-dimensional [CdBr2(4,4′-bipy)] n (4,4′-bipy is 4,4′-bipyridine) neutral networks, based on the octahedral Cd atom coordinated by four μ2-Br and two μ2-4,4′-bipy at trans positions, yielding a CdBr4N2 octahedron. It crystallizes in the orthorhombic system ( Cmmm). All the crystallographically independent atoms are on special positions, namely Cd on mmm, Br on mm, N on mm2, and C on sites of symmetry m or mm2. Optical absorption spectroscopy reveals the presence of an optical gap of 3.76 eV, indicating that the complex is a wide-gap semiconductor. Photoluminescence investigation reveals that the complex displays strong colour-tunable emissions, which might originate from a ligand-to-ligand charge-transfer (LLCT) transition. Thermogravimetric differential thermal analysis shows that the complex is thermally stable up to 493 K. [ABSTRACT FROM AUTHOR]

In the title compound, [Zn(NO3)2(C2H8N2)2], the ZnII atom lies on a centre of inversion and is coordinated by four N atoms belonging to two ethylenediamine molecules and two O atoms belonging to two nitrate anions arranged in a trans manner. The ZnII ion displays a distorted octahedral coordination geometry. Adjacent complexes are connected by N—H...O hydrogen bonds formed between the H atoms of the amino groups and the uncoordinated O atoms of the nitrate anions. [ABSTRACT FROM AUTHOR]

The title compound, C9H12N2O3, is an important intermediate for the synthesis of biologically active heterocyclic compounds. The planar hydrazide group is oriented with respect to the benzene ring at a dihedral angle of 82.93 (3)°. [ABSTRACT FROM AUTHOR]

The title compound, C8H8Cl2N2OS, is an important intermediate for the synthesis of biologically active heterocyclic compounds. The planar hydrazide group is oriented with respect to the benzene ring at a dihedral angle of 88.93 (3)°. [ABSTRACT FROM AUTHOR]

The title compound, C17H19N3O4S, is an important intermediate for the synthesis of biologically active heterocyclic compounds. The thiosemicarbazide group is approximately planar and forms dihedral angles of 33.03 (6) and 45.48 (5)° with the benzene rings. The structure is stabilized by intramolecular N—H...O, N—H...N and C—H...S, and intermolecular N—H...O, N—H...S, C—H...S and C—H...O hydrogen-bond interactions. [ABSTRACT FROM AUTHOR]