Excited state dynamics of zinc and aluminum phthalocyanine carboxylates.
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.
Idowu
Mopelola
M
Department of Chemistry, Rhodes University, Grahamstown, South Africa.
Ogunsipe
Abimbola
A
Nyokong
Tebello
T
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
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