Synthesis, characterization and optical properties of a new cationic cyclometalated platinum(ii) complex

The cyclometalated platinum (II) complex, [Pt(ppy)(ppyH)(2)] OTF, 2, in which ppy and ppyH denote the cyclometalated and non-cyclometalated 2-phenylpyridine ligand respectively, was prepared from the reaction of the platinum(IV) complex [PtMe3(OTF)], 1, with 3 equiv 2-phenylpyridine at room temperature. The cyclometalated complex 2 was characterized using H-1 NMR spectroscopy. The solid state structure of 2 was further identified by single crystal X-ray structure determination. 2 displays a green emission in solution and in solid state at room temperature and TD-DFT calculations is used to elucidate the origin of the electronic transitions in the UV-vis spectrum of 2.