簇外羧环化的十一顶钌、铂和镍十硼烷簇合物的结构研究

Structures of Eleven vertex Ru, Pt and Ni Decaborane Clusters with Exo polyhedral Carboxy cyclization

簇外羧环化的十一顶钌、铂和镍十硼烷簇合物结构表明：６种钌簇合物均为闭式结构，按１２４２２（原子比）的方式堆积，可形成１个或２个簇外五员环；２种铂簇合物与５种镍簇合物均属巢式结构，铂簇合物形成１个簇外五员环，镍簇合物则可形成２个甚至３个簇外五员环．在镍簇合物中，参与环化的Ｎｉ—Ｂ距离比相应的未参与环化的距离明显缩短。

The structures of eleven vertex Ru, Pt and Ni boranes clusters with exo polyhedral cyclizations show: All of six ruthenaboranes have closo {RuB 10 } cage with 1∶2∶4∶2∶2 stack, each of them contains one or two five membered rings of ero polyhedral cyclization. Two platinaboranes and five nickellaboranes have nido structure containing one (platinaboranes), two or even three (nickellaboranes) five membered rings of exo polyhedral cyclization. In the nickellaboranes, the distances of boron atoms participating in exo polyhedral cyclization to Ni atom are shorter than the corresponding non cyclized Ni B distances. The cyclization can strengthen the nickel borane bonding.