Squarilium dyes, their infrared and resonance Raman spectra and possible use in redox reactions for solar-energy conversion
- 1 January 1982
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 78 (6) , 1847-1866
- https://doi.org/10.1039/f19827801847
Abstract
Infrared and resonance Raman spectra of squarilium dyes I–VI of the type [graphic omitted] are presented and some vibrational modes of the central 4-membered ring are assigned. Methyl viologen dication (MV2+) is reduced photocatalytically by IV in DMSO + H2O (95/5, v/v) with a quantum yield ϕ of (1.8 ± 0.4)× 10–3 at 406.7 nm, if EDTA is present. Oxidation products of MV2+ behave similarly with ϕ=(4.7 ± 0.6)× 10–2 at 457.9 nm in DMF + H2O (2/1, v/v). IV˙+ seems to oxidize H2O nearly reversibly.Keywords
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