Synthesis and characterization of Pt(II) and Au(I) complexes with N -oxy-heterocyclic carbene ligands (NOHCs).

Two N -alkyloxy- N '-phenylimidazolium proligands and the corresponding platinum(II) cyclometalated N -alkyloxyimidazol-2-ylidene complexes with β-diketonate auxiliary ligands, [(C NOHC ^C*)Pt(L∩L)] (L∩L = acetyacetonate (acac) or 1,3-bis(2,4,6-trimethylphenyl)-propane-1,3-dionato (mesacac)) were synthesized and fully characterized. In addition, a Au(I) monocarbene complex was synthesized, isolated and characterized. Solid-state structures of two cyclometalated platinum(II) NOHC complexes and the Au(I) NOHC complex were obtained providing structural proof.