Graphical Abstract
A tertiary arsane ligand in a bridging position occurs for the first time in the structurally characterized transition-metal complex 2, which was prepared from 1 by stepwise ligand substitution of both the trialkylstibane and acetylacetonate ligands. The analogous chainlike phosphane-bridged dimer [ClRh(μ-PMe3)(μ-CPh2)2Rh(μ-Cl )2Rh(μ-PMe3)(μ-CPh2)2RhCl] has also been isolated and characterized by X-ray crystallography.