Abstract
Abstract Hexamethyleneammonium hexamethylenedithiocarbamate (HMTC) was photolyzed by UV light to yield carbon disulfide as the decomposition product. This photolysis could be sensitized by thiazine dyes, such as methylene blue and thionine. New methylene blue was the most effective among the sensitizers of this type examined. Bewteen the reciprocal concentration of HMTC and the reciprocal quantum yield, a linear relation was observed. The presence of oxygen was essential for the sensitization. Systems containing methylene blue appear to be more sensitive to oxygen than those containing thionine or new methylene blue. In the presence of an appropriate reducing agent such as allylthiourea, the quantum yield was decreased. The sensitization mechanism by thiazine dyes was probably different from that by benzophenone previously reported. It seems that the sensitization by thiazine dyes takes place by means of the interaction of the triplet state of the sensitizer with dissolved oxygen.
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