title: Optical spectroscopy of a highly fluorescent aggregate of bacteriochlorophyll c.
abstract: 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.
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe 85287-1604.
authors.forename: T P
authors.initials: TP
authors.lastname: Causgrove
authors.forename: P
authors.initials: P
authors.lastname: Cheng
authors.forename: D C
authors.initials: DC
authors.lastname: Brune
authors.forename: R E
authors.initials: RE
authors.lastname: Blankenship
mesh_terms: D001419:Bacteria / Q000737:chemistry*; D001426:Bacterial Proteins / Q000737:chemistry*; D001429:Bacteriochlorophylls / Q000737:chemistry*; D005453:Fluorescence; D008956:Models, Chemical; D055095:Optics and Photonics; D010777:Photochemistry; D010860:Pigments, Biological; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D001426:Bacterial Proteins; D001429:Bacteriochlorophylls; D010860:Pigments, Biological; C002084:bacteriochlorophyll c