title: Excited state dynamics of zinc and aluminum phthalocyanine carboxylates.
abstract: Photophysical parameters for zinc and aluminium tetracarboxylphthalocyanines (ZnTCPc and AlTCPc, respectively) and their octacarboxy substituted counterparts (ZnOCPc and AlOCPc) were studied. Data for the fluorescence quenching of the complexes by benzoquinone (BQ) were treated using the Stern-Volmer analysis, and the quenching was found to follow a diffusion-controlled (dynamic) bimolecular mechanism. Theoretical values of bimolecular rate constant for complex-BQ interactions were determined using the Stokes-Einstein-Smoluchowski model; and the values, together with the Stern-Volmer quenching constants were used in calculating the fluorescence lifetimes of the complexes. The thermodynamics of the MPc-BQ interaction, in terms of solvent reorientation energy is also discussed.
authors.affiliation: Department of Chemistry, Rhodes University, Grahamstown, South Africa.
authors.forename: Mopelola
authors.initials: M
authors.lastname: Idowu
authors.forename: Abimbola
authors.initials: A
authors.lastname: Ogunsipe
authors.forename: Tebello
authors.initials: T
authors.lastname: Nyokong
mesh_terms: D016227:Benzoquinones / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry*; D004583:Electrons; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D017967:Zinc Compounds
chemical_list: D016227:Benzoquinones; D002264:Carboxylic Acids; D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D012997:Solvents; D017967:Zinc Compounds; C052159:Zn(II)-phthalocyanine; C004532:quinone; C060570:aluminum phthalocyanine