首页|The excited state behavior of Group IA alkaline-metal phthalocyanines revealed by photoluminescence and singlet oxygen formation
The excited state behavior of Group IA alkaline-metal phthalocyanines revealed by photoluminescence and singlet oxygen formation
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NSTL
Elsevier
Group IA alkaline-metal phthalocyanine (Pc) complexes (Li2Pc, Na2Pc, K2Pc, Rb2Pc, Cs2Pc) have been synthesized and purified to study their excited state behavior. Their UV-Vis electronic absorption spectra, fluorescence emission and excitation spectra, fluorescence quantum yields and lifetimes, as well as singlet oxygen formation quantum yields have been measured in DMF. These photophysical properties are compared with that of H2Pc. The fluorescence and singlet oxygen formation properties reveal that alkaline metal Pcs show weak heavy atom effect. The results also reveal that alkaline-metal Pcs (Na2Pc, K2Pc, Rb2Pc, and Cs2Pc) show very different excited singlet state (S-1) behavior from that of Li2PC and H2Pc. While S-1 decay of Li2PC is mainly via intersystem crossing and fluorescence, the S-1 decay of M2Pc (M = Na, K, Rb, Cs) is mainly metal ion dissociation: M2Pc(S-1) -> 2M(+) + [Pc](2-)(S-1), in addition to the intersystem crossing. (C) 2021 Elsevier B.V. All rights reserved.
Group IA metal phthalocyanineFluorescence spectraUV-Vis absorptionFluorescence lifetimeSinglet oxygen formationHOLE TRANSPORTING MATERIALSPHOTOPHYSICAL PROPERTIESZINC-PHTHALOCYANINEFABRICATIONREDUCTIONTETRABENZOTRIAZACORROLEPHOTOSENSITIZERSFLUORESCENCEPORPHYRINSEFFICIENT
NSTL
Elsevier
