uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
High Extinction Coefficient Ru-Sensitizers that Promote Hole Transfer on Nanocrystalline TiO2
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Photochemistry and Molecular Science.
Show others and affiliations
2014 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 15, no 6, 1154-1163 p.Article in journal (Refereed) Published
Abstract [en]

Two series of Ru-II polypyridyl compounds with formulas [(bpy)(2)RuL](PF6)(2) and [(deeb)(2)RuL](PF6)(2), where bpy is 2,2-bipyridine, deeb is 4,4-diethylester-2,2-bpy, and L is one of several substituted 9-(1,3-dithiole-2-ylidene)-4,5-diazafluorene ligands, were studied as potential photosensitizers for TiO2. These compounds possess notably high extinction coefficients (40000M(-1)cm(-1) @470 nm) which are shown by time-dependent density functional theory (TD-DFT) calculations to result from overlapping metal-to-ligand charge transfer (MLCT) and ligand-localized transitions. Low-temperature absorption and photoluminescence measurements were suggestive of a short-lived MLCT excited state. When adsorbed onto TiO2 thin films, both the free ligands (L) and their corresponding [(deeb)(2)RuL](2+) complexes exhibited rapid excited-state electron injection into TiO2; in the case of the complexes, this was followed by rapid (k>10(8) s(-1)) hole transfer from Ru-III to the 1,3-dithiole ring of the L ligand. Observation of diffusion-limited reductive quenching of the [Ru(bpz)(3)](2+)* (bpz is 2,2-bipyrazine) excited state by the L ligands in solution supported the occurrence of intramolecular hole transfer following electron injection by the TiO2-anchored complexes.

Place, publisher, year, edition, pages
2014. Vol. 15, no 6, 1154-1163 p.
Keyword [en]
charge transfer, dye-sensitized solar cells, extinction coefficients, hole transfer, Ruthenium
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-225022DOI: 10.1002/cphc.201301193ISI: 000334080700021OAI: oai:DiVA.org:uu-225022DiVA: diva2:719546
Available from: 2014-05-26 Created: 2014-05-26 Last updated: 2014-05-26Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
Department of Photochemistry and Molecular Science
In the same journal
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 174 hits
ReferencesLink to record
Permanent link

Direct link