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Improved light absorbance does not lead to better DSC performance: studies on a ruthenium porphyrin–terpyridine conjugate

Lanzilotto, A. and Büldt, L. A. and Schmidt, H. C. and Prescimone, A. and Wenger, O. S. and Constable, E. C. and Housecroft, C. E.. (2016) Improved light absorbance does not lead to better DSC performance: studies on a ruthenium porphyrin–terpyridine conjugate. RSC advances, 6. pp. 15370-15381.

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Abstract

The preparation and characterization of 7-(4-([2,20:60,200-terpyridin]-40-yl)phenyl)-5,10,15,20-tetraphenyl- porphyrinatozinc(II), 3, are reported, and the structure of 3 has been confirmed by a single crystal structure determination. Reaction of RuCl3$3H2O with diethyl (4-([2,20:60,200-terpyridin]-40-yl)phenyl) phosphonate, 4, followed by 3 in reducing conditions gives [Ru(3)(4)][PF6]2. In solution, 3 and [Ru(3)(4)] [PF6]2 undergo two, reversible porphyrin-centred oxidation processes at lower potential than the Ru2+/ Ru3+ process in [Ru(3)(4)][PF6]2. In the solution absorption spectra, the Soret and Q bands in 3 are little perturbed upon complex formation; the MLCT band in [Ru(3)(4)][PF6]2 has lmax 1⁄4 492 nm. Spectroelectrochemical data for 3 and [Ru(3)(4)][PF6]2 are presented. [Ru(3)(4)]2+ binds to nanoparticulate TiO2 and the solid-state absorption spectrum confirms enhanced light absorption with respect to the standard dye-sensitized solar cell (DSC) dye N719. However, the photoconversion efficiencies of DSCs sensitized with [Ru(3)(4)]2+ are disappointingly low. Transient absorption spectroscopic studies on this series of compounds indicate that triplet–triplet energy transfer processes are likely to be responsible for this poor performance.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Constable)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Wenger)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Constable, Edwin Charles
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:11 Jan 2017 15:34
Deposited On:20 Jun 2016 12:51

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