Preparation and characterisation of palladium, platinum and manganese di (organo) carbene complexes from quinolinone and quinolinium precursorsElectronic supplementary information (ESI) available: Fig. S1: Unit cell diagram of 5. Table S1: 1H and 13C-1H NMR data of ligand precursors 1a and 2. See http: //www. rsc. org/suppdata/dt/b3/b314217p/