Abstract
The fluorescence quenching rate constant of MgTPP, ZnTPP and CdTPP by CdS clusters (2R 60A˚) in 2-propanol decreases slightly from MgTPP to ZnTPP and CdTPP, in fair agreement with values ofE0 (MTPP+/1MTPP*). On the other hand, the recombination luminescence quenching efficiency (KMTPP) of CdS(e-/h+) by several metalloporphyrins does not follow the trend in the redox potential of the electron acceptor,E0(MTPP/MTPP-). Values ofKMTPP range from 1.1 × 104 M-1 for NiTPP to 3.9 × 104 M-1 with CdTPP. Fluorescence quenching of1MTPP* by CdS (2R 60A˚) led toKCdS = 4.0 × 103 M-1 (MgTPP), 2.1 × 103 M-1 (ZnTPP) and 1.9 × 103 M-1 (CdTPP). Recombination luminescence quenching data were treated in terms of Langmuir-type adsorption of MTPP on CdS particles leading to appropriate adsorption constants (K).
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