Coordination of the macrocyclic thioether 1,4,7-trithiacyclononane (TTCN) to chromium(3+) and to dimolybdenum(2+) di-acetato bridged molecules
作者:Heinz-Josef Küppers、Karl Wieghardt
DOI:10.1016/s0277-5387(00)80638-5
日期:1989.1
Although chromium(III) is a hard acid and the macrocyclic thioether 1,4,7-trithiacyclonone (TTCN) a soft base, the following compounds could be synthesized: [Cr(TTCN)Cl3], [Cr(TTCN)(SO3CF3)3] and [Cr(TTCN)2]3+ (a rare example of a CrIII (thioether)6 coordination sphere). Comparison with the analogous 1,4,7-triazacyclononane (TACN) complexes shows that the bonding is relatively weak and the ligand-field
尽管铬(III)是一种硬酸,大环硫醚1,4,7-三硫代环酮(TTCN)是一种软碱,但可以合成以下化合物:[Cr(TTCN)Cl 3 ],[Cr(TTCN)(SO)3 CF 3)3 ]和[Cr(TTCN)2 ] 3+(Cr III(硫醚)6配位球的罕见例子)。与类似的1,4,7-三氮杂环壬烷(TACN)配合物进行比较表明,键合相对较弱,配体场分裂小。这与这些配体在“晚期”过渡金属中的键合特性形成鲜明对比,这是由于Cr 3+缺乏π供体的能力所致。中心。TTCN与(Mo 2)4+单元形成数个二聚体二乙酰基桥接的复合物。TTCN的空间和电子效应的独特相互作用导致三齿配体与[MO 2(μ-OAc)2 ] 2+单元的异常配位。