Optical spectroscopy of a highly fluorescent aggregate of bacteriochlorophyll c

Bacteriochlorophyll (BChl) c and a similar model compound, Mg-methyl bacteriopheophorbide d, form several types of aggregates in nonpolar solvents. One of these aggregates is highly fluorescent, with a quantum yield higher than that of the monomer. This aggregate is also unusual in that it shows a r...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1993-05, Vol.97 (21), p.5519-5524
Main Authors: Causgrove, Timothy P, Cheng, Peiling, Brune, Daniel C, Blankenship, Robert E
Format: Article
Language:English
Subjects:
140505 - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-)
400102 - Chemical & Spectral Procedures
400500 - Photochemistry
ALKALINE EARTH METAL COMPLEXES
Analytical, structural and metabolic biochemistry
BACTERIA
Bacteria - chemistry
Bacterial Proteins - chemistry
Bacteriochlorophylls - chemistry
Biological and medical sciences
CARBOXYLIC ACIDS
CHLOROPHYLL
COMPLEXES
COMPUTERIZED SIMULATION
DIMERS
Exobiology
FLUORESCENCE
Fundamental and applied biological sciences. Psychology
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
Heterocyclic compounds, pigments
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LUMINESCENCE
MAGNESIUM COMPLEXES
MICROORGANISMS
Models, Chemical
MONOMERS
Optics and Photonics
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
Other biological molecules
Photochemistry
PHYTOCHROMES
PIGMENTS
Pigments, Biological
PORPHYRINS
PROTEINS
SIMULATION
SOLAR ENERGY
SOLVENTS
Space life sciences
SPECTROSCOPY
Spectrum Analysis - methods
Tetrapyrrolic pigments
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Description
Summary:Bacteriochlorophyll (BChl) c and a similar model compound, Mg-methyl bacteriopheophorbide d, form several types of aggregates in nonpolar solvents. One of these aggregates is highly fluorescent, with a quantum yield higher than that of the monomer. This aggregate is also unusual in that it shows a rise time in its fluorescence emission decay at certain wavelengths, which is ascribed to a change in conformation of the aggregate. An analysis of fluorescence depolarization data is consistent with either a linear aggregate of four or five monomers or preferably a cyclic arrangement of three dimers.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100123a011