论文信息 - Switch-over of the Mechanism of the Primary Processes in the Photo-oxidation of Xanthene Dyes as Revealed by the Oxygen Consumption Experiments

Switch-over of the Mechanism of the Primary Processes in the Photo-oxidation of Xanthene Dyes as Revealed by the Oxygen Consumption Experiments

The oxygen up-take of irradiated aqueous solutions of xanthene dyes has been investigated by means of Warburg’s apparatus, and evidence for a switch-over from a D–O to a D–D mechanism is obtained from the variation of dye-concentration. This view is supported by the photobleaching rate and the oxygen concentration effect at high eosine concentrations (∼10−4M).The quautum yields (γo2) of the consumption are estimated and it is found that γo2(D–D) is larger than γo2(D–O).

[1] H. Blum,et al. Photochemistry of Fluorescein Dyes. , 1932 .

[2] H. Obata,et al. Studies of the Photoreduction of Thiazine Dyes in Aqueous Solutions , 1964 .

[3] L. Grossweiner,et al. TRANSIENT MEASUREMENTS OF PHOTOCHEMICAL PROCESSES IN DYES. II. THE MECHANISM OF THE PHOTOSENSITIZED OXIDATION OF AQUEOUS PHENOL BY EOSIN1 , 1963 .

[4] Volker Kasche,et al. Reactions between the Triplet State of Fluorescein and Oxygen1 , 1964 .

[5] M. Koizumi,et al. Irreversible Photobleaching of the Solution of Fluorescent Dyes. I. Kinetic Studies on the Primary Process , 1955 .

[6] T. Ohno,et al. An Attempt to Determine Eosine’s S*→T Transition Probability and Evidence for the Participation of a D–D Redox Mechanism , 1965 .

[7] Shunji Kato,et al. Studies of the Transient Intermediates in the Photoreduction of Methylene Blue , 1964 .