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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Nickel(II) complexes based on dithiolate-polyamine binary ligand systems: crystal structures, hirshfeld surface analysis, theoretical study, and catalytic activity study on photocatalytic hydrogen generation
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Nickel(II) complexes based on dithiolate-polyamine binary ligand systems: crystal structures, hirshfeld surface analysis, theoretical study, and catalytic activity study on photocatalytic hydrogen generation

机译:基于二氨酸多胺二元配体系统的镍(II)复合物:晶体结构,HIRSHFELD表面分析,理论研究和光催化氢气产生的催化活性研究

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摘要

To ascertain the influence of binary ligand systems [1,1-dicyanoethylene-2,2-dithiolate (i-mnt(-2)) and polyamine {tetraen = tris(2-aminoethyl)amine, tren = diethylene triamine and opda = o-phenylene-diamine}] on the coordination modes of the Ni(II) metal center and resulting supramolecular architectures, a series of nickel(II) thiolate complexes [Ni(tetraen)(i-mnt)](DMSO) (1), [Ni-2(tren)(2)(i-mnt)(2)] (2), and [Ni-2(i-mnt)(2)(opda)(2)](n) (3) have been synthesized in high yield in one step in water and structurally characterized by single crystal X-ray crystallography and spectroscopic techniques. X-ray diffraction studies disclose the diverse i-mnt(-2) coordination to the Ni+2 center in the presence of active polyamine ligands, forming a slightly distorted octahedral geometry (NiN4S2) in 1, square planar (NiS4) and distorted octahedral geometries (NiN6) in the bimetallic co-crystallized aggregate of cationic [Ni(tren)(2)](+2) and anionic [Ni(i-mnt)(2)](-2) in 2, and a one dimensional (1D) polymeric chain along the [100] axis in 3, having consecutive square planar (NiS4) and octahedral (NiN6) coordination kernels. The N-H center dot center dot center dot O, N-H center dot center dot center dot S, N-H center dot center dot center dot N, N-H center dot center dot center dot S, N-H center dot center dot center dot N, and N-H center dot center dot center dot O type hydrogen bonds stabilize the supramolecular assemblies in 1, 2, and 3 respectively imparting interesting graph-set-motifs. The molecular Hirshfeld surface analyses (HS) and 2D fingerprint plots were utilized for decoding all types of non-covalent contacts in the crystal networks. Atomic HS analysis of the Ni+2 centers reveals significant Ni-N metal-ligand interactions compared to Ni-S interactions. We have also studied the unorthodox interactions observed in the solid state structures of 1-3 by QTAIM and NBO analyses. Moreover, all the complexes proved to be highly active water reduction co-catalysts (WRC) in a photo-catalytic hydrogen evolution process involving iridium photosensitizers, wherein 2 and 3 having a square planar arrangement around the nickel center(s) - were found to be the most active ones, achieving 1000 and 1119 turnover numbers (TON), respectively.
机译:为了确定二元配体系统[1,1-双氰基乙烯-2,2-二硫氰酸酯(i-mnt(-2))和多胺{tetraen=三(2-氨基乙基)胺,tren=二乙烯三胺和opda=邻苯二胺]对Ni(II)金属中心的配位模式和由此产生的超分子结构的影响,一系列镍(II)硫代配合物[Ni(tetraen)(i-mnt)](DMSO)(1),[Ni-2(tren)(2)(i-mnt)(2)](2)和[Ni-2(i-mnt)(2)(opda)(2)](n)(3)已在水中一步高收率合成,并通过单晶X射线晶体学和光谱技术对其结构进行了表征。X射线衍射研究显示,在活性多胺配体存在的情况下,不同的i-mnt(-2)与Ni+2中心配位,在1中形成轻微扭曲的八面体几何形状(NiN4S2),在2中形成方形平面(NiS4)和扭曲的八面体几何形状(NiN6),在阳离子[Ni(tren)(2)](+2)和阴离子[Ni(i-mnt)(2)](-2)的双金属共结晶聚集体中,以及沿[100]轴的一维(1D)聚合物链,其具有连续的方形平面(NiS4)和八面体(NiN6)配位核。N-H中心点中心点O、N-H中心点中心点S、N-H中心点中心点N、N-H中心点中心点S、N-H中心点中心点N和N-H中心点中心点O型氢键分别稳定了1、2和3中的超分子组装体,赋予有趣的图形集基序。分子Hirshfeld表面分析(HS)和2D指纹图谱用于解码晶体网络中所有类型的非共价接触。对Ni+2中心的原子HS分析显示,与Ni-S相互作用相比,Ni-N金属-配体相互作用显著。我们还通过QTAIM和NBO分析研究了在1-3的固态结构中观察到的非正统相互作用。此外,在涉及铱光敏剂的光催化析氢过程中,所有配合物都被证明是高活性的水还原共催化剂(WRC),其中2和3在镍中心周围呈正方形平面排列,被发现是最活跃的,分别达到1000和1119个周转数(吨)。

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