Electrochemistry, electron spin resonance, optical spectroscopy, and reactivity of organometallic platinum(II) complexes containing strongly p-accepting aromatic a-diimine ligands
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Journal of Organometallic Chemistry 436 (3): 367--378 (1992)

Low-lying metal-to-ligand charge transfer (MLCT) transitions of the new complexes LPtPh2 L = 3,3'-bipyridazine (bpdz), 4,4'-bipyrimidine (bpm), 2,2'-bipyrazine (bpz) and 1,4,7,10-tetraazaphenanthrene (tap) have been studied by emission and solvent-dependent absorption spectroscopy. (Bpm)PtPh2 is strongly solvatochromic, and exhibits five absorption bands in toluene, but does not show luminescence. The other complexes emit visible light on excitation in the solid or in acetonitrile soln. (bpdz complex). The one- and two-electron-reduced states were generated electrochem.; the ESR spectra of the paramagnetic intermediates, including (bpy)PtPh2-.bul., are consistent with the formulation PtII/(L-.bul.). The rate of oxidative addn. of iodomethane to Ph2Pt(L) correlates with the basicity of L. on SciFinder(R)
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