2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 4. Mamalis Intl. Symp. / Advanced Manufacturing
| Editors: | F. Kongoli, A. G. Mamalis, K. Hokamoto |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 352 pages |
| ISBN: | 978-1-987820-88-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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A New Ruthenium(II) Photosensitizer With Bipyridines Containing Electron Donor/Withdrawing Groups
Fernando Federico Salomón1; Mauricio Cattaneo2; Néstor Katz3;1INQUINOA, San Miguel de Tucumán, Argentina; 2INQUINOA, San Miguel de Tucuman, Argentina; 3UNIVERSIDAD NACIONAL DE TUCUMáN, San Miguel de Tucumán, Argentina;
Type of Paper: Regular
Id Paper: 90
Topic: 48
Abstract:
Ruthenium(II) polypyridyl complexes have interesting physicochemical properties that can be applied in energy conversion processes. Since the development of the Grätzel cell, considerable efforts have been made to find new materials for dye-sensitized solar cells (DSSCs) [1]. In this work, a new polypyridylruthenium(II) complex, of formula [Ru(DMO-bpy)2(Mebpy-CN)]2+, (1), where DMO-bpy = 4,4'-dimethoxy-2,2'-bipyridine and Mebpy-CN = 4-methyl-2,2'-bipyridine-4'-carbonitrile, has been synthesized as a PF6- salt and characterized by spectroscopic, photophysical and electrochemical techniques.<br />Mebpy-CN ligand is an adequate anchoring entity to bind ruthenium photosensitizers to ZnO semiconductor surfaces in DSSCs [2]. The UV-Vis absorption spectrum of (1) in CH<sub>3</sub>CN shows two intense bands with maxima at 453 and 492 nm that can be assigned to MLCT transitions from dpi(Ru) orbitals to pi* orbitals of DMO-bpy and Mebpy-CN respectively. The emission spectrum shows a band at a maximum of 679 nm, with a quantum yield Φ = 3x10-3. The redox potential of the RuIII/RuII couple was determined by CV as E1/2 = 1.12 V (vs. SCE). The cathodic shift of E1/2 and the red shifts of both the UV-Vis absorption and emission maxima respect to the corresponding values of [Ru(bpy)3]2+ are the result of destabilization of dpi(Ru) HOMOs induced by two bpys with electron-donor groups [3]. This may prove useful to enhance the efficiency of DSSCs.