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Photophysical properties of diphenyl-2,3-dihydroxychlorin and diphenylchlorin

Paper ID Volume ID Publish Year Pages File Format Full-Text
31246 44577 2006 6 PDF Available
Title
Photophysical properties of diphenyl-2,3-dihydroxychlorin and diphenylchlorin
Abstract

The photophysical properties of 5,15-diphenyl-2,3-dihydroxychlorin (DPCOH) and 5,15-diphenyl-chlorin (DPC) in organic solution were studied. Absorption, fluorescence, triplet state and photobleaching experiments are reported. The ground states of both compounds show strong absorbance in red region (λ = 638 nm, ε = 35,000 M−1 cm−1 and λ = 645 nm, ε = 42,000 M−1 cm−1, respectively) and the singlet excited states show low fluorescence quantum yields of 0.0802 and 0.150 in benzene and the lifetimes are 7.38 and 10.18 ns, respectively. Absorption spectra of the triplet states were also measured and they have nearly the same triplet state lifetimes of 53 μs (DPCOH) and 50 μs (DPC). The triplet quantum yields are 0.82 and 0.75, respectively. The data of photobleaching quantum yields show that the presence of oxygen does not significantly affect the photobleaching. All the results demonstrate that both diphenylchlorines are good candidates for second-generation photosensitizer in photodynamic therapy.

Keywords
Chlorins; Photophysical properties; Absorption; Fluorescence; Triplet state
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 82, Issue 2, 1 February 2006, Pages 140–145
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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