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Keywords:

  • Gold;
  • P ligands;
  • Sandwich complexes;
  • Coordination modes;
  • Ab initio calculations

Abstract

We describe the synthesis of a ferrocenylene-bridged bis[2,5-bis(2-pyridyl)]phosphole ligand that shows additional rotational degrees of freedom relative to its previously described p-phenylene-bridged congener. The coordination behaviour of this ferrocenylene-based bis-N,P,N pincer towards coinage metal centres MI with M = Cu and Au was explored, revealing different coordination modes with and without involvement of N donation. Upon coordination of AuI metal centres, different isomers of a bimetallic AuI complex were isolated in the crystalline solid state that showed (or did not) intramolecular aurophilic interaction. Aurophilic as well as Au–N interactions have been investigated by means of ab initio calculations.