Abstract
The photoreactivity of zinc tetraphenylporphyrin (ZnTPP) in the presence of photoexcited CdS nanoparticles and molecular oxygen in 2‐propanol has been revisited. The photodecomposition of ZnTPP in 2‐propanol, in the presence of CdS(e- CB/h+ VB) and molecular oxygen, is linked to isopropyl free radicals formed by both hole transfer from CdS(h+ VB) to CHOH and the reaction of superoxide ion (O2 −) with 2‐propanol. Isopropyl free radicals react with ZnTPP, leading to the formation of ZnTPP•−. Intermediate paramagnetic species monitored by EPR spectroscopy (g = 2.0029, ΔH = 5.7G) were characterized as superoxides formed in the reaction of ZnTPP•− with O2. Further transformations of such EPR‐active species lead to the formation of diamagnetic intermediate photoproducts of ZnTPP observed by absorption and emission spectroscopy.
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