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Inorganic Chemistry, Vol.50, No.22, 11273-11275, 2011
Photocatalytic Splitting of CS2 to S-8 and a Carbon-Sulfur Polymer Catalyzed by a Bimetallic Ruthenium(II) Compound with a Tertiary Amine Binding Site: Toward Photocatalytic Splitting of CO2?
The catalytic photocleavage of CS2 to S-8 and a (CxSy)(n) polymer with visible light using a dinuclear ruthenium(II) compound with a bipyridine units for photoactivity and a vicinal tertiary amine binding site for CS2 activation was studied. The catalyst was characterized by X-ray diffraction, H-1 NMR, and C-13 NMR, ESI-MS and elemental analysis. CS2 photocleavage was significant (240 turnovers, 20 h) to yield isolable S-8 and a (CxSy)(n) polymer. A mononuclear catalyst or one without an amine binding site showed significantly less activity. XPS of the (CxSy)(n) polymer showed a carbon/sulfur ratio similar to 1.5-1.6 indicating that in part both C-S bonds of CS2 had been cleaved. Catalyst was also included within the polymer. The absence of peaks in the H-1 NMR verified the (CxSy)(n) nature of the polymer, while C-13 NMR and IR indicated that the polymer had multiple types of C-S and C-C bonds.