A non-platonic M4L4 complex constructed using heterotopic ligands

Abstract

An unusual, chloride-capped M₄L₄ complex has been prepared using heterotopic ligands with carboxylate and dipyridyl coordinating sites. The incorporation of low symmetry, heterotopic ligands into the M₄L₄ architecture gives rise to a non-platonic complex with irregular triangular faces, demonstrating that the standard high-symmetry model traditionally adopted for synthesising such complexes is not a strict rule. The M₄L₄ compound is also observed by mass spectrometry in solution, yet shows no indication of host–guest behaviour in its small cavity. The assembly of the complex is assisted by a ‘belt’ of CH⋯π interactions.