Flash photolysis of eosin in aqueous miceliar dispersions

The Influence of Aggregation of Porphyrins on the Efficiency of Photogeneration of Hydrogen Peroxide in Aqueous Solution

“…Several authors have discussed the effects of porphyrin aggregates on the formation of singlet oxygen. [28][29][30] In the present study, we found that the aggregated form of porphyrin enhanced the production of H 2 O 2 probably via the formation of O 2 Ϫ . Such a process has not been considered previously.…”

Triplet-triplet absorption of eosin Y in methanol determined by nanosecond excimer laser excitation and picosecond light continuum probing

“…A triplet state lifetime of r P =0.6 ± 0.2 *is was obtained. The short triplet state lifetime is caused by oxygen quenching [20,66,[68][69][70][71]73,74]. The dots were measured after about five hours of nitrogen bubbling through the sample.…”

“…The depopulation of the triplet state [1][2][3]16,20,66,[68][69][70][71][72][73][74] is caused by radiative decay where R is the semireduced radical of eosin Y [13,16,66,71] (an electron is added) and X is the semi-oxidized radical of eosin Y [13,16,66,71 ] (an electron is removed). 3 0 2 is ground-state triplet oxygen and l 0 2 is excited singlet oxygen.…”

“…Methanol of analytic grade was purchased from Merck and used without further purification. For the triplet-triplet absorption crosssection measurements the dye solution was bubbled with nitrogen gas (purity 99.999 vol%) to outgas oxygcn [68][69][70] which quenches the triplet level population [66,[68][69][70][71].…”

The Effect of Two Viologens on the Solution Speciation of Tetrakis([rho]-carboxyphenyl)porphine

“…In an early "theoretical" era synthetic chemists (17)(18)(19)(20)(21)(22)(23)(24)(25)(26) worked in conjunction with molecular spectroscopists, physical and bioinorganic chemists (1-16,27-32) to develop a physical understanding of porphyrin-mediated processes. In the present "applied" era porphyrins are studied for their ability to function in some practical application such as solar energy conversion , trace metal analysis (72,73), or tumor therapy (74)(75)(76)(77)(78)(79)(80)(81)(82). The intense interest in porphyrins over the last thirty years has resulted in a huge and divergent body of literature.…”