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We synthesized a novel series of compounds based on a ruthenium(II)<br />dicarboxybipyridine (dcbpy) complex containing chloro and trans-1,4-bis[2-(4-pyridyl)ethenyl]benzene<br />(BPEB) ligands. The binuclear species Na-6[{[Ru-II(dcbpy)(2)Cl}(2)(BPEB)]<br />exhibits an electrochromic effect when reduced, which is assigned<br />to the radical BPEB0/., similarly as in viologen-based compounds.<br />The carboxylate groups on the 4,4' positions of bipyridine allow<br />a strong attachment to the TiO2 surface, contributing to an efficient<br />and reversible electron transfer from the oxide to the chromophoric<br />ligand, coloring the oxide film blue. The coloration efficiency CE(lambda)<br />at 633 nm was 109 cm(2) C-1, which is high compared to TiO2 itself.<br />The complex also exhibits a high photon-to-electron conversion efficiency<br />(IPCE > 70%) when applied as a photoanode in a dye sensitized solar<br />cell (DSSC).




Nogueira, A. F., Toma, S. H., Vidotti, M., Formiga, A. L. B., Córdoba De Torresi, S. I., & Toma, H. E. (2005). A highly efficient redox chromophore for simultaneous application in a photoelectrochemical dye sensitized solar cell and electrochromic devices. New Journal of Chemistry, 29(2), 320–324. https://doi.org/10.1039/b411122b

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