Synthesis and Electronic Spectroscopy of Luminescent Cyclometalated Platinum−Anthracenyl Complexes

Dicyclometalated complexes syn - and ant i-[Pt 2 (L) 2 (PAnP-H 2 )](OTf) 2 ( Pt 2 ) are synthesized from reactions of 9,10-bis(diphenylphosphino)anthracene (PAnP) and Pt(L)(OTf) 2 (L = diphosphines, OTf = CF 3 SO 3 ). Because of metal perturbation on the electronic structure of the anthracenyl ring, the 1 B 2u − ← 1 A g transition, which is forbidden in anthracene, is observed in the electronic spectra of Pt 2 . The complexes display fluorescence arising from the ligand-centered S 1 excited state. No significant heavy atom effect is observed in the Pt 2 complexes. To understand the effect of the number of Pt ions on the extent of perturbation, a mononuclear analogue, [Pt(dppe)(PAn-H)]ClO 4 (PAn = 9-diphenylphosphinoanthracene), is prepared and its spectroscopy studied.