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Synthesis, structure, and properties of [Pt(II)(diimine)(dithiolate)] dyes with 3,3 '-, 4,4 '-, and 5,5 '-disubstituted bipyridyl: Applications in dye-sensitized solar cells

Geary, E A M and Yellowlees, L J and Jack, L A and Oswald, I D H and Parsons, S and Hirata, N and Durrant, J R and Robertson, N (2005) Synthesis, structure, and properties of [Pt(II)(diimine)(dithiolate)] dyes with 3,3 '-, 4,4 '-, and 5,5 '-disubstituted bipyridyl: Applications in dye-sensitized solar cells. Inorganic Chemistry, 44 (2). pp. 242-250. ISSN 0020-1669

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Abstract

A family of [Pt(Ii)(diimine)(dithiolate)] complexes of general formula [Pt{X,X'(CO2R)(2)-2,2'-bipyridyl}(maleonitriledithiolate)] (where X = 3, 4, or 5 and R = H or Et) have been synthesized, spectroscopically and electrochemically characterized, and attached to a TiO2 substrate to be tested as solar cell sensitizers. A single-crystal X-ray structure showing a large torsion angle between the bipyridyl rings was determined for [Pt{3,3'(CO2Et)(2)-2,2'-bipyridyl}(maleonitriledithiolate)]MeCN. The effect of changing the position of the bipyridyl substituents from 3,3' to 4,4' and 5,5' is discussed with reference to structural and electronic changes seen within the different members of the family of molecules. The first UV/vis/NIR spectroelectrochemical study of complexes of this general formula is discussed. All three complexes (where R = H) were tested as solar cell sensitizers, with the 3,3'-disubstituted bipyridyl complex giving an intermediate dye loading value but superior photovoltaic performance to those of the other two. The performance of this sensitizer is then compared with that of a well-known Ru polypyridyl sensitizer, the ditetrabutylammonium salt of [RuL2(NCS)(2)] (L = 2,2'-bipyridyl-4,4'-dicarboxylato), commonly called N719.

Item type: Article
ID code: 31359
Keywords: nanocrystalline titanium-dioxide, diimine dithiolate complexes, excoeted-state, TIO2 films, thin-films, platinum(ii), dynamics, photosensitization, 2,2'-bipyridine, spectroscopy, Pharmacy and materia medica, Physical and Theoretical Chemistry, Inorganic Chemistry
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 01 Jul 2011 16:12
    Last modified: 05 Sep 2014 09:11
    URI: http://strathprints.strath.ac.uk/id/eprint/31359

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