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EFFECTS OF SOLVENT ON THE FLUORESCENCE PROPERTIES OF BACTERIOCHLOROPHYLL a
Abstract
Fluorescence lifetimes (τ f) of bacteriochlorophyll a (BChl a) have been measured by the method of time‐correlated single‐photon counting on dilute (1 μ M) solutions of the pigment in 15 solvents. There is a pronounced dependence of τ f on the nature of the solvent. Specifically, τ f, is longer when the central magnesium is hexacoordinated than when pentacoordinated and shorter when the macrocycle is hydrogen‐bonded than when it is not, but the latter effect is more pronounced. Both trends were confirmed by parallel studies on bacteriopheophytin a (BPheo a). Because of the short lifetimes (˜ 2.2–3.6 ns), quenching of fluorescence by molecular oxygen is not a significant factor in aerated solutions of the bacterial pigments. However, reabsorption artifacts are non‐negligible, which necessitates studies on dilute solutions. Fluorescence quantum yields (ø f) have been estimated for BChl a in 13 solvents by comparing the observed fluorescence lifetimes with the radiative lifetimes calculated from the integrated absorption spectra.
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Cited by
Frischmann, P. D., Mahata, K., & Würthner, F. (2013) · Chem. Soc. Rev. · doi:10.1039/c2cs35223k · Cited by 620
Database of Absorption and Fluorescence Spectra of >300 Common Compounds for use in Photochem CAD
Taniguchi, M., & Lindsey, J. S. (2018) · Photochemistry and Photobiology · doi:10.1111/php.12860 · Cited by 431
Superradiance and Exciton Delocalization in Bacterial Photosynthetic Light-Harvesting Systems
Monshouwer, R., Abrahamsson, M., van Mourik, F., & van Grondelle, R. (1997) · The Journal of Physical Chemistry B · doi:10.1021/jp963377t · Cited by 406
Rätsep, M., Cai, Z.-L., Reimers, J. R., & Freiberg, A. (2011) · The Journal of Chemical Physics · doi:10.1063/1.3518685 · Cited by 131
Obata, D., Takabayashi, A., Tanaka, R., Tanaka, A., & Ito, H. (2019) · Molecular Biology and Evolution · doi:10.1093/molbev/msz193 · Cited by 17
Metadata
- Authors
- Connolly, J. S., Samuel, E. B., & Janzen, A. F.
- Venue
- Photochemistry and Photobiology
- Publisher
- Wiley
- Published
- 1982-11
- Volume
- 36
- Issue
- 5
- Pages
- 565-574
- ISSN
- 0031-8655 (ISSN-L)
- 1751-1097
- OpenAlex
- W2096234399
- Cited by
- 159
- References
- 0
- FWCI
- 7.27
- Type
- journal article
- Language
- en
- Open access
- closed
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- Connolly, J. S., Samuel, E. B., & Janzen, A. F. (1982). EFFECTS OF SOLVENT ON THE FLUORESCENCE PROPERTIES OF BACTERIOCHLOROPHYLL a. Photochemistry and Photobiology. https://doi.org/10.1111/j.1751-1097.1982.tb04417.x
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