title: Photophysical studies of the pheophorbide a dimer.
abstract: This work reports on a monomer-dimer equilibrium state of pheophorbide a in solution. A methodology for controlling the equilibrium constant by use of temperature and solvent variation is described. The absorption spectrum of the dimer is calculated, using different prepared equilibria of monomer and dimer in solution. We propose that these aggregates provide a good model for understanding the dimerization process in tetrapyrroles.
authors.affiliation: Humboldt-Universität Berlin, Institute of Physics, Department of Photobiophysics, Germany. eichwurzel@mbi-berlin.de
authors.forename: I
authors.initials: I
authors.lastname: Eichwurzel
authors.forename: H
authors.initials: H
authors.lastname: Stiel
authors.forename: B
authors.initials: B
authors.lastname: Röder
mesh_terms: D000042:Absorption; D002734:Chlorophyll / Q000031:analogs & derivatives* / Q000737:chemistry; D019281:Dimerization; D005453:Fluorescence; D019684:Magnoliopsida / Q000737:chemistry; D008432:Mathematical Computing; D011166:Porphyrins / Q000737:chemistry*; D011838:Radiation-Sensitizing Agents / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods
chemical_list: D011166:Porphyrins; D011838:Radiation-Sensitizing Agents; D002734:Chlorophyll; C032623:pheophorbide a