Photochemical Reaction of Magnesium Tetraphenylporphyrin with CS2

Abstract

The photochemical reaction of magnesium tetraphenyl porphyrin (MgTPP) with carbon disulfide (CS₂) was investigated in dichloromethane (CH₂Cl₂) by UV-vis absorption and steady-state fluorescence spectroscopic techniques to simulate the photochemical interaction of CS₂ with chlorophyll. These spectra showed that under irradiation MgTPP reacted with CS₂. The kinetics of photochemical reaction of MgTPP with CS₂ has been studied in a CS₂-saturated solution. Under irradiation the experimental rate follows a pseudo first order reaction for MgTPP, having a half-life from (31 to 69) min under various irradiation intensities. The kinetic rate constants of photochemical reaction of MgTPP with CS₂ showed a linear dependence. The photochemical reaction of MgTPP with CS₂ is of key interest in elucidating fundamental reaction mechanisms associated with this class of chlorophyll in presence of CS₂.