並列摘要
We have investigated the time-resolved phosphorescence spectra of the singlet oxygen molecules, populated through photosensitization, in n-hexane solutions of tetraphenyl porphine (TPP). Five aliphatic amine quenchers are separately added to observe their quenching effects on the effective lifetimes of the singlet oxygen. The quenching rate constants of these aliphatic amine quenchers have been determined. They, in unit of 10^4 M^(-1) s^(-1), are 12.4 (t-butylamine), 4.8 (n-hexylamine), 3.8 (n-pentylamine), 3.0 (n-butylamine) and 2.3 (i-propylamine). The quenching rate constant of n-pentylamine and that of n-hexylamine are reported for the first time. The variation trend of the quenching rate constants or norm al amines is interpreted in terms of their ionization potentials. The results are compared with some previous reports.