Electron transfer dynamics in nanocrystalline titanium dioxide solar cells sensitized with ruthenium or osmium polypyridyl complexes

Article Abstract:

A optical spectroscopic study of interfacial electron transfer dynamics on the nanosecond time scale for nanocrystalline titanium dioxide photoelectrodes sensitized with a series of osmium and ruthenium complexes, Ru (H2L')(sub 2)(CN) 2, Os(H2L')(sub 2)- (CN)2, Ru(H2L)(sub 2)(NCS)2 and OS (H2L)2 (NCS)(sub 2), are investigated. Solar cells sensitized with Ru (H2L')(sub 2)(CN) 2, Os(H2L')(sub 2)- (CN)2, Ru(H2L)(sub 2)(NCS)2 and OS (H2L)2 (NCS)(sub 2) have favorable photoelectrochemical characteristics and iodide is also oxidized efficiently.

Spectra, Platinum group, Platinum group metals, Structure

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Comparison of the self-exchange and interfacial charge-transfer rate constants for methyl- versus tert-butyl-substituted Os(III) polypyridyl complexes

Article Abstract:

The homogeneous self-exchange and standard interfacial electron-transfer rate constants of a relatively unhindered osmium polypyridyl complex is compared to the rate constants for a system that has large tert-butyl groups that inhibit the close approach of the reaction partners. The results have indicated that the tert-butyl group can act as a spacer on an outer-sphere redox couple and also decrease the electronic coupling of the electron-transfer in both self-exchange and interfacial electron-transfer processes.

Science & research, Osmium, Research, Electric properties, Charge transfer, Tertiary butyl compounds

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Anchoring group and auxiliary ligand effects on the binding of ruthenium complexes to nanocrystalline TiO2 photoelectrodes

Article Abstract:

The thermodynamics and kinetics of binding to nanocrystalline TiO2 were investigated for five ruthenium complexes that differed structurally in the number of possible anchoring carboxy groups(one, two, four, or six) attached to coordinated bipyridyl ligands and in the number of auxiliary ligands and in the number of auxiliary ligands [bipyridine, CN(super -), or SCN(super -)].

Ruthenium, Analysis, Ligand binding (Biochemistry)

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