Abstract
The syntheses and spectral, photophysical and photochemical properties of some zinc phthalocyanine derivatives – {2, (3)- tetra(quinoxalinyl)phthalocyaninato zinc(II), (β-ZnPc) and 1, (4)- tetra(quinoxalinyl)phthalocyaninato zinc(II), (α-ZnPc)} – are presented. The β-substituted complex is more fluorescent and exhibits lower tendencies to undergo intersystem crossing than its α-substituted counterpart, as judged by the former's higher fluorescence quantum yield ( Φ F ) and lower triplet quantum yield ( Φ T ) than the latter's in three solvents (DMSO, DMF and toluene). Singlet oxygen quantum yield ( Φ Δ ) values show the same trends as Φ T values. The differences in the spectral and photophysical properties of α-ZnPc and β-ZnPc are partly attributed to greater molecular distortions in the former. Studies of the interaction of the triplet states of α-ZnPc and β-ZnPc with triplet oxygen showed that α-ZnPc is more vulnerable to oxygen quenching than β-ZnPc. Also, the smallest quenching rate constants were observed in DMSO, which is attributed to the higher viscosity of DMSO than DMF and toluene.
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