Synthesis and characterization of cyclopalladated ionic complexes

A series of new cationic ortho-metalated Pd(II) complexes of general formula [(C ∧ N)Pd(N ∧ N)]X (HC ∧ N = 2-phenylpyridine, H(PhPy) or benzo[ h ]quinoline, H(BhQ); N ∧ N = ethylenediamine, 2,2′-bipyridine, 1,10-phenanthroline, N , N , N ′, N ′-tetramethylethylenediamine, 4,4′-dimethyl-2,2′-bipyridine, 4,7-dimethyl-1,10-phenanthroline, or 4,4′-dinonyl-2,2′-bipyridine; X = CF 3 SO 3 ) are reported. Photophysical characterization of these species indicates that electronic transitions are prominently cyclometalating ligand-localized in character and nearly unaffected by the polarity of solvent in which the spectra are recorded.