摘要 : The triple-decker cation salts [(eta~5-C_5Me_5)M(mu-eta~5-C_5Me_5)M(eta~5-C_5Me_5)][B(C_6F_5)_4] (M = Sn,Pb) have been prepared by treatment of [(eta~5-C_5Me_5)M][B(C_6F_5)_4] with the corresponding metallocenes,[M(eta~5-C_5Me_5)_... 展开 The triple-decker cation salts [(eta~5-C_5Me_5)M(mu-eta~5-C_5Me_5)M(eta~5-C_5Me_5)][B(C_6F_5)_4] (M = Sn,Pb) have been prepared by treatment of [(eta~5-C_5Me_5)M][B(C_6F_5)_4] with the corresponding metallocenes,[M(eta~5-C_5Me_5)_2] (M = Sn,Pb).Investigation of the structures of these triple-decker systems by X-ray crystallography revealed an overall cis-type cationic geometry.In solution,NMR studies indicate that the triple-decker cations undergo rapid,reversible dissociation.The reaction of [In(eta~5-C_5Me_5)] with an equimolar quantity of H_2O centre dot B(C_6F_5)_3 and B(C_6F_5)_3] afforded [(eta~6-toluene)In(mu-eta~5-C_5Me_5)In(eta~6-toluene)][(C_6F_5)_3B(OH)B(C_6F_5)_3].Density functional theory calculations on a model system indicate that the capping toluene molecules in this di-indium cation are weakly bonded.Use of the smaller counter-ion [B(C_6F_5)_4]~- results in isolation of the inverse sandwich cation [In(mu-eta~5-C_5Me_5)In]~+. 收起