摘要
The solvent viscosity dependence of the photophysical and photochemical properties of tetra(tert-butylphenoxy)phthalocyaninato zinc(II) (ZnTBPPc) is presented. The fluorescence quantum yields (ΦF) and Stern-Volmer′s constant (KSV) for ZnTBPPc fluorescence quenching by benzoquinone in all the solutions followed a semi-empirical law that depends only on the solvent viscosity. ΦF values vary between 0.08 in tetrahydrofuran (THF) and 0.14 in dimethylsulphoxide (DMSO). Triplet quantum yields (ΦT) and lifetimes (τT) also exhibit clear solvent viscosity dependence with the values being higher in the most viscous solvents. The interaction of the ZnTBPPc triplet state with oxygen was found to be diffusion- controlled, but higher rate constants were observed in low-viscosity solvents like THF and toluene. Absolute values of singlet oxygen quantum yields (ΦΔ) were determined, and the values are comparable in all the solvents, which is attributed to the proximity of the ZnTBPPc triplet energies in different solvents.
The solvent viscosity dependence of the photophysical and photochemical properties of tetra（tert-butylphenoxy）phthalocyaninato zinc（II） （ZnTBPPc） is presented. The fluorescence quantum yields （ΦF） and Stern-Volmer′s constant （KSV） for ZnTBPPc fluorescence quenching by benzoquinone in all the solutions followed a semi-empirical law that depends only on the solvent viscosity. ΦF values vary between 0.08 in tetrahydrofuran （THF） and 0.14 in dimethylsulphoxide （DMSO）. Triplet quantum yields （ΦT） and lifetimes （τT） also exhibit clear solvent viscosity dependence with the values being higher in the most viscous solvents. The interaction of the ZnTBPPc triplet state with oxygen was found to be diffusion- controlled, but higher rate constants were observed in low-viscosity solvents like THF and toluene. Absolute values of singlet oxygen quantum yields （ΦΔ） were determined, and the values are comparable in all the solvents, which is attributed to the proximity of the ZnTBPPc triplet energies in different solvents.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2011年第5期1045-1052,共8页
Acta Physico-Chimica Sinica
基金
supported by the Department of Science and Technology(DST) and National Research Foundation(NRF)of South Africa throughDST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology and Rhodes University
关键词
物理学
知识
KSV
ZnTBPPc
Phthalocyanine
Solvent
Viscosity
Fluorescence
Triplet state
Singlet oxygen
