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The cyclometalated complexes [RuL(terpy)][PF 6 ] 2 ( 3, L = N ‘ ‘-methyl-4‘-methylthio-2,2‘:6‘,4‘ ‘-terpyridinium; 4, L = N ‘ ‘-methyl-4‘-methylthio-2,2‘:6‘,3‘ ‘-terpyridinium) with a (N,N,N)(N,N,C)-coordination mode were synthesized in good yields and fully characterized by X-ray crystallographic, spectroscopic, and electrochemical measurements. 13 C{ 1 H} NMR and electronic spectra revealed that the Ru−C bond of complex 4, which has a quaternized N-Me unit at the para -position of the carbon atom bonding to the metal center in the terminal ring of the tridentate ligand, involves carbenic (Ru C) character in solution.
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Koizumi et al. (2003) studied this question.
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