Citation: OGUNSIPE Abimbola, NYOKONG Tebello. Solvent Effects on the Photophysicochemical Properties of Tetra(tert-butylphenoxy)phthalocyaninato Zinc(II)[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1045-1052. doi: 10.3866/PKU.WHXB20110508 shu

Solvent Effects on the Photophysicochemical Properties of Tetra(tert-butylphenoxy)phthalocyaninato Zinc(II)

OGUNSIPE Abimbola ¹ ,
NYOKONG Tebello ^2,

1.
1. Department of Chemistry, Kwara State University, Malete; P.M.B 1530, Ilorin, Nigeria;
2. Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa

Received Date: 9 December 2010
Available Online: 28 March 2011
Fund Project: The project was supported by the Department of Science and Technology (DST) (DST)National Research Foundation (NRF) of South Africa through DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology and Rhodes University. (NRF)

The solvent viscosity dependence of the photophysical and photochemical properties of tetra(tert-butylphenoxy)phthalocyaninato zinc(II) (ZnTBPPc) is presented. The fluorescence quantum yields (Φ_F) and Stern-Volmer′s constant (K_SV) for ZnTBPPc fluorescence quenching by benzoquinone in all the solutions followed a semi-empirical law that depends only on the solvent viscosity. Φ_F values vary between 0.08 in tetrahydrofuran (THF) and 0.14 in dimethylsulphoxide (DMSO). Triplet quantum yields (Φ_T) and lifetimes (τ_T) 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 (Φ_Δ) 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.
- Phthalocyanine,
- Solvent,
- Viscosity,
- Fluorescence,
- Triplet state,
- Singlet oxygen
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