compounds. The ionic character of the Ae-ligand bond encourages bridging coordination, whereas the number of bridging ligands is controlled by steric factors. DFT computations also indicate that in [Ba(μ2-X1)(X2)]2 heteroleptic dimers, ligand predilection for bridging vs. terminal positions is dictated by the ability to establish secondary interactions between the metals and the ligands.
由庞大的
硼烷氧化物 [OBR 2 ] -(其中 R=CH(SiMe 3 ) 2 , 2,4,6 - i Pr 3 -C 6 H 2或 2,4,6-(CF 3 ) 3 -C )连接的
钡配合物6 H 2 )、
硅氧化物[OSi(SiMe 3 ) 3 ] -和/或苯氧化物[O-2,6-Ph 2 -C 6 H 3 ] -,已经准备好了。在固态中观察到均配和杂配复合物的多种配位模式,配位数在 2 和 4 之间。杂配二聚体中桥接
配体的身份 [Ba(μ 2 -X 1 )(X 2 )] 2 在很大程度上取决于给定的一对
配体 X 1和 X 2。实验上,填充桥接位置的倾向根据 [OBCH(SiMe 3 ) 2 } 2 )] − <[N(SiMe 3 ) 2 ] − <[OSi(SiMe 3 ) 3 ]- <[O(2,6-Ph 2 -C 6 H 3 )] - <[OB( 2,4,6 - i Pr 3 -C 6 H