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Synthesis and Electronic Spectroscopy of Luminescent Cyclometalated Platinum−Anthracenyl Complexes

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posted on 17.12.2007, 00:00 by Jian Hu, Ronger Lin, John H. K. Yip, Kwok-Yin Wong, Dik-Lung Ma, Jagadese J. Vittal
Dicyclometalated complexes syn- and anti-[Pt2(L)2(PAnP-H2)](OTf)2 (Pt2) are synthesized from reactions of 9,10-bis(diphenylphosphino)anthracene (PAnP) and Pt(L)(OTf)2 (L = diphosphines, OTf = CF3SO3). Because of metal perturbation on the electronic structure of the anthracenyl ring, the 1B2u1Ag transition, which is forbidden in anthracene, is observed in the electronic spectra of Pt2. The complexes display fluorescence arising from the ligand-centered S1 excited state. No significant heavy atom effect is observed in the Pt2 complexes. To understand the effect of the number of Pt ions on the extent of perturbation, a mononuclear analogue, [Pt(dppe)(PAn-H)]ClO4 (PAn = 9-diphenylphosphinoanthracene), is prepared and its spectroscopy studied.