The preparation and characterisation of monomeric and linked metal carbonyl clusters containing the closo-Si2Co4 pseudo-octahedral core
作者:Cameron Evans、Gwion J. Harfoot、J. Scott McIndoe、C. John McAdam、Kenneth M. Mackay、Brian K. Nicholson、Brian H. Robinson、Martin L. Van Tiel
DOI:10.1039/b208374b
日期:2002.12.9
PhSiH3 reacts with [Co4(CO)12] at 50 °C in hydrocarbon solvents to give [(μ4-SiPh)2Co4(CO)11], 2c, shown by an X-ray crystal structure determination to have a pseudo-octahedral Si2Co4 core. Substituted aryl-silanes behaved similarly. Mixtures of PhSiH3, H3SiC6H4SiH3 and [Co4(CO)12] in a ca. 2 ∶ 1 ∶ 2 ratio gave the dimeric cluster [Co4(μ4-SiPh)(CO)11Si}2C6H4], 3a, which has the two Si2Co4 cores linked
PhSiH 3在50°C下与[Co 4(CO)12 ]反应烃 溶剂得到[(μ 4 -SiPh)2共4(CO)11 ],2C,通过X射线晶体结构测定表明,具有伪八面体的Si 2共4芯。取代的芳基硅烷的行为相似。PhSiH 3,H 3 SiC 6 H 4 SiH 3和[Co 4(CO)12 ]的混合物在约3h内。2:1:2的比例,得到的二聚簇[钴4(μ 4 -SiPh)(CO)11的Si} 2 C ^ 6 ħ 4 ],参见图3a,其具有通过C 6 H 4基团连接的两个Si 2 Co 4核以给出刚性分子,X射线结构分析显示该分子长于23Å。从PhSiH 3,α,ω-(H 3 Si)2(CH 2)8和[Co 4(CO)12 ]的混合物中分离了由–(CH 2)8-基团连接的相关二聚体。电化学研究表明3a中的两个簇单元不发生电子相互作用。