Synthesis, structure and properties of {M<sub>4</sub>O<sub>4</sub>} cubanes containing nickel(<scp>ii</scp>) and cobalt(<scp>ii</scp>)
作者:Katharina Isele、Fabienne Gigon、Alan F. Williams、Gérald Bernardinelli、Patrick Franz、Silvio Decurtins
DOI:10.1039/b614424a
日期:——
A survey of the crystal structures containing simple M4O4} cubane units is reported. It shows that the average M–M distance in these complexes is relatively constant for a given metal ion M. The structures are all distorted from the idealised cube to a Td structure, and most show a further distortion which, however, usually maintains some elements of symmetry. A system for classifying the different types of ligand in these complexes is proposed. Two new cubanes of cobalt(II) and nickel(II) with the ligand (R,R)-bis-1,2-(1-methylbenzimidazol-2-yl)ethane-1,2-diol, (R,R)-1 or its enantiomer have been isolated and the crystal structure of the cobalt(II) complex confirms the cubane structure. Electronic, CD and 1H NMR spectra and magnetic susceptibility data are reported. The magnetic data for these and other compounds in the literature are discussed in terms of the structural parameters.
报告对含有简单M4O4}立方单元的晶体结构进行了研究。结果表明,对于给定的金属离子 M,这些配合物的平均 M-M 间距是相对恒定的。这些结构都从理想化的立方体变形为 Td 结构,而且大多数都显示出进一步的变形,但通常都保持了一定的对称性。本文提出了一种对这些配合物中不同类型配体进行分类的系统。已分离出两种新的钴(II)和镍(II)立方体,其配体为(R,R)-双-1,2-(1-甲基苯并咪唑-2-基)乙烷-1,2-二醇、(R,R)-1 或其对映体,钴(II)配合物的晶体结构证实了立方体结构。报告了电子、CD 和 1H NMR 光谱以及磁感应强度数据。从结构参数的角度讨论了这些化合物和文献中其他化合物的磁性数据。