Structure and Bonding in Organometallic Anions of Heavy Group 14 and 15 Elements

摘要

Alkali metal organometallic complexes (containing C-metal bonds) and the frequently structurally related alkali metal amides and alkoxides have been investigated extensively both in the solid state and in solution in the past two decades. However, until recently, the related complexes containing the heavier metallic and semi-metallic p block elements and the alkali and alkaline earth metals had rarely been studied in their own right. Recent solid-state structural studies have illustrated the immensestructural diversity and bonding modes to be found within these species. One of the principal focuses of recent studies has been complexes containing organometallic anions of p block metals (e.g. triorganostannates. containing R_3Sn~-) in which metal-meial bonds occur between the heavy p block metal and the alkali or alkaline earth metal and the investigation of the naiure of this bonding. The development of new synthetic routes has also allowed the preparation of a variety of anionic ligands with p block metal centers which promise new opportunities in coordination chem-istry. In addition, the synthesis of a family of homologous anionic pi complexes has given a fresh direction in the chemistry of p block metal mctallocenc complexes.