Abstract
We present the synthesis, characterization, and photophysical properties of two series of alkynyl–platinum(II) complexes containing the phenylquinoline (Hpq) or the cyclometalated phenylquinolinyl (pq) ligand. Unusual monoanionic complexes (NBu4)[Pt(C≡CR)3(Hpq)] (R = Tol 1, C6H4OMe-3 2, C6H4CF3-4 3) were generated in moderate yield by treatment of [Pt(pq)(μ-Cl)]2 with an excess of LiC≡CR (1:8), followed by subsequent treatment with NBu4 in iPrOH. However, a similar reaction with LiC≡CtBu evolves with formation of [Pt(pq)(μ–κCα:η2-C≡CtBu)]2 4. Related dimers [Pt(pq)(μ–κCα:η2-C≡CR)]2 (R = Tol 5, C6H4OMe-3 6, C6H4CF3-4 7) were successfully prepared by modification of the reaction conditions. Single-crystal studies were performed on 2, 4, and 5, revealing the presence of intramolecular (H···Pt and H···C≡C) and intermolecular Omethoxy···HHpq contacts in 2 and the formation of butterfly structures in 4 and 5. In the tBu derivative 4, a shorter intramolecular Pt···Pt separation was found [3.0936(3) A in 4 vs 3.2...
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