Further Evidence for Attractive Interactions between Gold(I) Centers in Binuclear Complexes

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Abstract
Another example of the conformation‐determining attractive interaction between gold(I) centers is presented, based on changes in the conformation of the butadiene skelton. The s‐trans ground state geometry of 2,3‐bis(diphenylphosphino)‐1,3‐butadiene (2) is abandoned in the gold complex 3, and the two gold atoms are brought into contact at a distance of 3.023(1) Å. The conformational change of the Ligand also occurrs at a single metal atom, where the bisphosphine acts as a difunctional chelating ligand, as demonstrated in the rhodium complex 4.