Synthesis, structures and spectroscopic properties of platinum complexes containing orthometalated 2-phenylpyridine

The synthesis, structure and spectroscopy of a series of luminescent orthometalated square planar platinum(II) complexes are reported. Reaction of K(2)PtCl(4) with one mole equivalent of 2-phenylpyridine (ppyH) in 2-ethoxyethanol and water (1:1 ratio) resulted in the formation of chloro-bridged dimeric precursor [Pt(2)(mu-Cl)(2)(ppy)(2)], which on further reactions with various anionic one-, two-and three-atom ancillary ligands, having O/N/S donors, yielded mono-and bi-nuclear platinum(II) complexes. Platinum(III) complexes of composition [Pt(2)Cl(2)(mu-Epy)(2)(ppy)(2)] have been isolated with pyE(-) (E = O or S) ligands. These complexes have been characterized by elemental analysis, NMR ((1)H, (31)P, (195)Pt) and absorption spectroscopy. The complexes [Pt(2)(mu-N(boolean AND)N)(2)(ppy)(2)] (N(boolean AND)N = pyrazole and 3,5-dimethylpyrazole); [Pt(S(boolean AND)S)(ppy)] (S(boolean AND)S = ethylxanthate and diisopropyldithiophosphate); [Pt(2)Cl(2)(mu-Epy)(2)(ppy)(2)] (Epy = 2-pyridinol{Opy} and 2-mercaptopyridine {Spy}) and [PtCl(ppy)(PhNC(Me)NHPh)] have been structurally characterized by X-ray crystallography. (C) 2010 Elsevier B.V. All rights reserved.