title: Exciton coupling of tetra(p-hydroxyphenyl)porphyrin controlled by substituents of counterions in Triton X-100 micellar solution.
abstract: The interactions of nonionic meso-tetra(p-hydroxyphenyl)porphyrin (THPP) with CX3COOH (X = F, Cl, Br) in Triton X-100 (TX) micellar solution have been investigated by optical absorption, resonance light-scattering, and fluorescence spectroscopies. The double red-shifted absorption bands and strong resonance light scattering (RLS) signal imply that the assemblies induced by trihalo acetic acids belong to J-aggregates. The fluorescence of porphyrin is quenched due to the aggregate formation. The kinetics of assemblies trigged by CBr3COOH is studied via stopped-flow techniques. No characteristics of autocatalyzed reactions are observed, and there is only a log phase. The nature of the exciton coupling of transition dipole moment can be systematically changed by the haloid substituents of the organic counteranion.
authors.affiliation: State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, PR China.
authors.forename: Xiwen
authors.initials: X
authors.lastname: Li
authors.forename: Deijia
authors.initials: D
authors.lastname: Li
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Zeng
authors.forename: Guolin
authors.initials: G
authors.lastname: Zou
authors.forename: Zhangping
authors.initials: Z
authors.lastname: Chen
mesh_terms: D019342:Acetic Acid / Q000737:chemistry*; D006846:Hydrocarbons, Halogenated / Q000737:chemistry*; D007477:Ions; D008823:Micelles; D015394:Molecular Structure; D017830:Octoxynol / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D012995:Solubility; D012996:Solutions / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D006846:Hydrocarbons, Halogenated; D007477:Ions; D008823:Micelles; D011166:Porphyrins; D012996:Solutions; D013501:Surface-Active Agents; C409084:tetraphenylporphyrin; D017830:Octoxynol; D019342:Acetic Acid