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Your search keyword '"You, Zhonglu"' showing total 167 results
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167 results on '"You, Zhonglu"'

19. Crystal structures and antimicrobial activity of zinc(II) and nickel(II) complexes of 5-bromo-(((2-(phenylamino)ethyl)imino)methyl)phenol

Author

Wu, Jiahui, Zhang, Xiaoqing, Zhang, Jiahui, Mao, Yongxin, Lan, Xue, Miao, Linan, Aishanjiang, Buheliqigu, Shi, Dahua, and You, Zhonglu

Abstract

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.

Published
2023
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32. Formation of Defect-Dicubane-Type Ni II 2 Ln III 2 (Ln = Tb, Er) Clusters: Crystal Structures and Modeling of the Magnetic Properties

Author

You, Zhonglu, Prsa, Krunoslav, Mutschler, Julius, Herringer, Susan N., Wang, Jiaqi, Luo, Yingying, Zheng, Boyang, Decurtins, Silvio, Krämer, Karl, Waldmann, Oliver, and Liu, Shi-Xia

Subjects
540 Chemistry, 570 Life sciences, biology
Abstract

In the field of molecular nanoclusters, cubane and defect-dicubane, or butterfly structures, are typical examples of tetranuclear metal core architectures. In this work, a halogenated and anionic Schiff-base ligand (L2–) is utilized as it is predisposed to chelate within a cluster core to both 3d and 4f metal ions, in different binding configurations (H2L = 4-chloro-2-(2-hydroxy-3-methoxybenzyliden amino)phenol). The phenolate oxygen atoms of the deprotonated ligand can act in μ-O and μ3-O bridging binding modes for the intramolecular assembly of metal ions. Based on that, two tetranuclear and isostructural compounds [Ni2Tb2(L)4(NO3)2(DMF)2]·2CH3CN (1) and [Ni2Er2(L)4(NO3)2(DMF)2]·0.5CH3CN (2) were synthesized and structurally characterized. Magnetic susceptibility and magnetization data indicate the occurrence of dominant intramolecular ferromagnetic interactions between the spin centers. Particular emphasis is given to the theoretical description of the magnetic behavior, taking into account the Ln–Ni and Ni–Ni coupling paths and the magnetic anisotropy of the LnIII and NiII ions. The study is distinguished for its discussion of two distinct models, whereby model A relies on the uniaxial B20 Stevens term describing the lanthanide anisotropy and model B is based on point-charge model calculations. Importantly, the physical meaning of the obtained parameters for both models was critically scrutinized.

Published
2021

34. Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties

Author

You, Zhonglu, Luo, Yingying, Herringer, Susan, Li, Yanmin, Decurtins, Silvio, Krämer, Karl W., and Liu, Shi-Xia

Subjects
nickel cluster, Cubane-type structure, structure elucidation, 540 Chemistry, lcsh:QD901-999, 570 Life sciences, biology, Schiff-base, magnetic properties, lcsh:Crystallography
Abstract

The cubane-type structure is a typical representative of tetranuclear coordination compounds. In this work, two anionic Schiff-base ligands, (L1)2&minus, and (L2)2&minus, each offering an O^N^O coordination pocket, ligate four NiII ions into a [Ni4O4] cubane core. The ligands are H2L1 = 2&minus, [[(3-ethoxy-2&minus, hydroxyphenyl) methylene]amino]benzenemethanol and H2L2 = 2&minus, [[(5-fluoro-2&minus, 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 &mu, 3-O binding mode. Magnetic susceptibility and magnetization data for compounds 1 and 2 are presented. The Ni&ndash, O&ndash, 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.

Published
2020
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45. Synthesis, characterization and crystal structure of a novel tetranuclear oxidovanadium(V) complex derived from <italic>N’</italic>-(2-hydroxy-3-methoxybenzylidene)isonicotinohydrazide with catalytic property.

Author

Zhang, Li, You, Zhonglu, and Qian, Heng-Yu

Abstract

Abstract A novel tetranuclear oxidovanadium(V) complex, [V4O4(OEt)4L4], where L is the dianionic form of N’-(2-hydroxy-3-methoxybenzylidene)isonicotinohydrazide (H2L), has been prepared and characterized by physico-chemical methods and single crystal X-ray diffraction. The V atom in the complex is coordinated by the phenolate oxygen, imino nitrogen and enolate oxygen of one aroylhydrazone ligand, one pyridine nitrogen of another aroylhydrazone ligand, one deprotonated ethanol oxygen, and one oxo group, forming an octahedral coordination. The oxidation of olefins with the complex as the catalyst was evaluated, which indicated that the complex has effective catalytic efficiency in the oxidation of several aliphatic and aromatic substrates by using tert-butyl hydrogen peroxide as oxidant. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Syntheses, crystal structures, and antimicrobial activities of tetranuclear Ni4 and Ni2Zn2 complexes derived from tetradentate Schiff bases.

Author

Zhao, Jie, Ji, Jing, Wang, Shiyi, Luo, Yingying, and You, Zhonglu

Subjects
SCHIFF bases, CRYSTAL structure, ANTI-infective agents, PSEUDOMONAS fluorescens, ASPERGILLUS niger, BACILLUS subtilis
Abstract

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]

Published
2021
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