A series of hydrogen bond mediated dinuclear nickel(II) complexes with reduced Schiff base ligands: An insight into the nature of their short intermolecular hydrogen bonds
Abstract A series of isostructural centrosymmetric hydrogen bonded dimeric nickel(II) complexes of general formula, [Ni2(HL)2(DMSO)2(H2O)2]X where H2L = N2O4 donor reduced Schiff base ligand, [H2L1=(2,2-dimethyl-1,3-propanediyl)bis(iminomethylene)bis(6-methoxyphenol) and H2L2=(2,2-dimethyl-1,3-propanediyl)bis(iminomethylene)bis(6-ethoxyphenol)] and X = counter anion}, are synthesized and characterized
Abstract A dinuclear mixed valence cobalt(II/III) complex, [(N3)CoIIIL(µ-CH3COO)CoII(N3)]∙CH3OH with a N2O4 donor compartmental reduced Schiff base ligand, H2L [(1,3-propanediyl)bis(iminomethylene)bis(6-ethoxyphenol)], has been synthesized and characterized by spectral and elemental analyses. Cobalt(III) is placed in the inner N2O2 compartment whereas cobalt(II) is present in the outer O4 compartment
Syntheses, characterization, crystal structures and Jack bean urease inhibitory activities of ZnII, CoII/III and NiII complexes derived from reduced Schiff base ligand
作者:Yanmin Li、Luyao Xu、Mengmeng Duan、Bitong Zhang、Yinghui Wang、Yixing Guan、Jiahui Wu、Changling Jing、Zhonglu You
DOI:10.1016/j.poly.2019.03.051
日期:2019.7
compound. Complex 2 is a dinuclear cobalt(II/III) compound. Complex 3 is a mononuclear nickel(II) compound. The cobalt complex and the nickelcomplex have effective urease inhibitory activities, with IC50 values of 19.8 and 11.6 μmol·L−1, respectively. However, the zinccomplex 1 has no such activity. Molecular docking study of complexes 2 and 3 with the active center of Jack bean urease was studied.
An insight to the spin density distribution and non-covalent interactions in a carboxylate bridged class-I mixed valence cobalt(II),cobalt(III) complex of quadruplet nature
37 kcal/mol more stable than the low spin configuration at the PBE0-D3/def2-ZVP level of theory thus evidencing that the quadruplet nature of the complex, in good agreement with the experimental effective magnetic moment. The spin density distribution for the low spin shows that the unpaired electron is located at the dx2-y2 orbital. For the high spin configuration, the spin density distribution is more spherical
使用六齿(N 2 O 4供体)隔室“还原的席夫碱”配体,硫氰酸盐和4-甲基-3-硝基苯甲酸酯作为阴离子共-基,合成了双核混合价钴(II),钴(III)配合物。配体。该配合物已通过光谱测量表征,并且其固态结构已通过单晶X射线衍射分析确定。在理论水平的PBE0-D3 / def2-ZVP上,高自旋构型比低自旋构型稳定37 kcal / mol,因此证明了配合物的四重态与实验有效磁矩非常吻合。低自旋的自旋密度分布表明未配对的电子位于d x 2处-y 2轨道。对于高自旋构型,由于三个d轨道的贡献,自旋密度分布更呈球形。氧和氮原子有一些自旋离域,这些氧和氮原子直接键合到钴(II)中心。但是,钴(III)的自旋密度可以忽略不计。研究了涉及4-甲基-3-硝基苯甲酸酯共配体的非共价π-堆积相互作用,分析了金属配位对相互作用强度的影响。相互作用还通过使用“非共价相互作用图”(NCI图)方法来表征。由于偶极-
Field-induced single-molecule magnet behaviour in a series of dinuclear cobalt(III,II) complexes
作者:Abhisek Banerjee、Carlos J. Gómez García、Samia Benmansour、Rosa M. Gomlia、Antonio Frontera、Shouvik Chattopadhyay
DOI:10.1016/j.poly.2022.115802
日期:2022.7
crystal X-ray structures of complexes 1–4 show that both cobalt centres in the four complexes adopt a distorted octahedral geometry with Co(III) and Co(II) centres residing at inner N2O2 and outer O4 pockets of the reduced Schiff base, respectively. Magnetic measurements show that all complexes behave as Co(II) monomers, confirming the presence of diamagnetic low spin Co(III) ions, which have also been
我们介绍了四种双核钴 (III,II) 配合物的合成、结构和磁性表征:[(NCS)Co III (L n )(µ–OAc)Co II (NCS)]·G,n/G = 1 /CH 3 OH ( 1 )、2/CH 3 CN ( 2 )、3/- ( 3 ) 和 4/CH 3 OH ( 4 ),即 H 2 L n,四种密切相关的还原席夫碱配体:H 2 L 1 = (1,3-丙二基)双(亚胺亚甲基)双(6-甲氧基苯酚), H 2 L 2 = (1,3-丙二基)双(亚胺亚甲基)双(6-乙氧基苯酚), H 2 L3 = (2,2-二甲基-1,3-丙二基)-双(亚胺亚甲基)双(6-甲氧基苯酚)和H 2 L 4 = (2,2-二甲基-1,3-丙二基)-双(亚胺亚甲基)双(6-乙氧基苯酚)。配合物1-4的单晶 X 射线结构表明,四个配合物中的钴中心均采用扭曲的八面体几何形状,Co(III) 和 Co(II) 中心位于内部