부산대학교 도서관

Singlet oxygen is produced through the O2[3∑g–] → O2[1Δg] transition of molecular oxygen upon direct 1270 nm laser irradiation in water. The non water-soluble 1,3-diphenylisobenzofuran (DPIBF) is encapsulated in lipid nanocapsules (LNCs) in D2O and used to monitor the formation of singlet oxygen in these microheterogeneous systems. A two-pseudophase kinetic model for 1O2distribution is applied to LNCs dispersions in D2O. From a simple analytical expression of the trap disappearance rate, both the σ1270absorption cross section of the O2[3∑g–] → O2[1Δg] transition and the reactivity of singlet oxygen toward DPIBF can be evaluated simultaneously and independently in LNCs dispersions in D2O, and σ1270can be extrapolated to pure deuterated water. The water-soluble chemical trap tetrapotassium rubrene-2,3,8,9-tetracarboxylate (RTC) is used to monitor the formation of singlet oxygen in water and D2O, and σ1270is also determined in these solvents. Absorption spectrum for the transition O2[3∑g–] → O2[1Δg] of molecular oxygen is measured in D2O.