Bipyrimidine-bridged rhenium(I)/rhenium(I) and ruthenium(II)/rhenium(I) complexes. Synthesis,electronic absorption and emission spectra |
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| Institution: | 1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia;2. Novosibirsk State University, Novosibirsk, Russia;3. G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhny Novgorod, Russia |
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| Abstract: | The binuclear complexes Cl(OC)3ReI(bipym)ReI(CO)3Cl] (bipym=2,2′-bipyrimidine), (bipy)2RuII(bipym)ReI(CO)3Cl](PF6)2 (bipy=2,2′-bipyridine) and their mononuclear component Re(bipym)(CO)3Cl] were prepared. The electronic absorption spectra of these complexes display low-energy Re(I) →π*(bipym) and Ru(II)→π*(bipym) charge transfer (CT) bands. While Re(bipym)(CO)3Cl] shows a strong emission from its lowest CT state, the dimer Cl(OC)3Re(bipym)Re(CO)3Cl] is not luminescent. The cation (bipy)2Ru(bipym)Re(CO)3Cl]2+ emits from the lowest-energy Ru→bipym CT state. The emission behavior of the binuclear complexes is described in terms of intramolecular excited state electron or energy transfer. |
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