1352575-57-5Relevant academic research and scientific papers
New C∧N∧C bis-cyclometalated platinum(II) complexes: Synthesis, structures, and photophysical properties
Fuertes, Sara,Brayshaw, Simon K.,Raithby, Paul R.,Schiffers, Stephanie,Warren, Mark R.
, p. 105 - 119 (2012)
The reaction of a new ligand, ethyl 2,6-diphenylisonicotinate (EtO 2C-C∧N∧C-H2), with K2PtCl4 in acetic acid affords the monocyclometalated complex [{(EtO2C- C∧N∧C-H)-Pt(μ-Cl)}2] (1), which transforms to the bis-cyclometalated derivative [Pt(EtO2C-C∧N∧C)(DMSO)] (2) when heated in hot DMSO. Complex 2 is the precursor for preparing a new series of neutral mononuclear bis-cyclometalated complexes [Pt(EtO2C- C∧N∧C)(L)] (L = tht (3), PPh3 (4), CN-tBu (5), py (6), py-tBu (7), py-NH2 (8), py-CN (9), py-CONH 2 (10)). These new complexes have been characterized spectroscopically, and structures of 2-10 have been determined crystallographically. Within each crystal structure the individual molecules pack in a head-to-tail arrangement. Noncovalent interactions, including ππ, C-HO, C-HN, N-HPt, N-Hπ, C-Hπ, and N-HO, contribute significantly to the supramolecular structures displayed by these complexes in the solid state. All complexes display UV-vis absorptions in dichloromethane solution. Excitation and emission studies as well as lifetime measurements are described and can be correlated to the solid-state structures of the complexes. DFT and TDDFT computational studies have been performed on 5 and 8 which support the conclusions drawn from the photophysical studies.
