T. Koizumi, Takashi Tomon, Koji Tanaka
Oct 1, 2005
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0
Influential Citations
22
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Journal
Journal of Organometallic Chemistry
Abstract
Abstract 1,8-Naphthyridine (napy) and terpyridine-analogous (N,N,C) tridentate ligands coordinated ruthenium (II) complexes, [Ru L (napy-κ 2 N , N ′) (dmso)](PF 6 ) 2 ( 1 : L = L 1 = N ″-methyl-4′-methylthio-2,2′:6′,4″-terpyridinium, 2 : L = L 2 = N ″-methyl-4′-methylthio-2,2′:6′,3″-terpyridinium) were prepared and their chemical and electrochemical properties were characterized. The structure of complex 1 was determined by X-ray crystallographic study, showing that it has a distorted octahedral coordination style. The cyclic voltammogram of 1 in DMF exhibited two reversible ligand-localized redox couples. On the other hand, the CV of 2 shows two irreversible cathodic peaks, due to the Ru–C bond of 2 containing the carbenic character. The IR spectra of 1 in CO 2 -saturated CH 3 CN showed the formation of Ru-(η 1 -CO 2 ) and Ru–CO complexes under the controlled potential electrolysis of the solution at −1.44 V (vs. Fc/Fc + ). The electrochemical reduction of CO 2 catalyzed by 1 at −1.54 V (vs. Fc/Fc + ) in DMF-0.1 M Me 4 NBF 4 produced CO with a small amount of HCO 2 H.