Complexes of Gold Clusters with the closo-Borate Anions B10H10~(2-) and B12H12~(2-)

摘要

For closo-borane anions,only one gold(I) complex with a closo-hexaborate anion [Au2(mu-bis(eta3-B6H6))(PPh3)2] has been synthesized and characterized [1,2].The complex crystallizes either in the cubic (A) or in the orthorhombic (B) polymorphous modification,depending on the solvent used.In both polymorphs,gold atoms are in a severely distorted tetrahedral environment:each gold atom is bound to three boron atoms of a trigonal face of the closo-hexaborate anion and to the phosphorus atom of triphenylphosphine.The compound is a binuclear complex and contains the hexabo-rate anion as a binder coordinated to the central metal atoms through the opposite B3 faces.This compound was synthesized by the reaction of tetrabutylammo-nium closo-hexaborate with [Au(PPh3)Cl].Thus,it is evident that gold complexes with cluster boron anions are virtually unstudied.