Tetrahedral Gold(I) Clusters with Carba-closo-dodecaboranylethynido Ligands: {12-(R3PAu)2C≡C-closo-1-CB_(11)H_(11)}2

摘要

The increasing interest in the supramolecular chemistry of gold(I) compounds is a result of the unusual, for example optical properties, of these substances that are a result of inter- and intramolecular aurophilic interactions. In turn, the self-assembly is often based on the intermolecular gold-gold interactions. Salts of the tetranuclear bis(triphenyl-phosphane gold(I))halonium dications A that contain four gold atoms in a distorted tetrahedral arrangement with four relatively short intermolecular Au—Au distances and two longer intramolecular Au—Au distances are unusual compounds of this type, which are only stable in the solid state. The bis(trigoldoxonium) dication B and the bis(tetraaurio-methane) complex C are the only other examples with a similar arrangement. Similar to A, complexes B and C were only observed in the solid state and they dissociate in solution because of electrostatic repulsion. A series, of other tetranuclear gold(I) clusters that consist of two dinuclear gold(I) complexes in which the four gold atoms lie at the corners of a distorted square is known, for example {(Ph3PAu)2SCH2Ph2}~(2+) (D).