Dinuclear platinum() complexes with biphenyl-based bis-carbene ligands

Multimetallic NHC (N-heterocyclic carbene) complexes comprising platinum( ii ) centers are rare. Four new dinuclear platinum( ii ) complexes possessing a combination of NHC and Py/4-Cl(Py) ligands are presented. Both classical and mesoionic carbene (MIC) ligands have been employed for the complexation. All complexes have been characterized using standard spectroscopic tools. The coordination of both classical NHC and pyridine ligands around the platinum( ii ) center in complex [ 2 ] has been established by using single crystal XRD. New bimetallic platinum( ii ) complexes with bis-NHC donor ligands featuring 4,4′-di-substitution pattern of the central biphenyl ring have been presented. The complex [ 2 ] has been tested as precatalyst in Pt II -catalyzed cycloisomerization of enyne.