An Attempt to Determine Fluorescein’s S–T Transition Probability and a Preliminary Investigation of the Behavior of Its Semiquinone in an Alkaline Solution
- 1 October 1965
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 38 (10) , 1601-1609
- https://doi.org/10.1246/bcsj.38.1601
Abstract
An attempt to obtain a reliable value of \varphiS-T for fluorescein in an alkaline solution has been unsuccessful since the values for EDTA and ATU were quite different. It has been found that a large quantity of semiquinone is produced when EDTA is used as a reducing agent. In the case of ATU, the quantity of semiquinone produced is very small. Semiquinone in an alkaline solution reverts to the oxidized dye by the second-order thermal reaction and, quite astonishingly, mostly by the reaction 2DH → 2D+H2. The photochemical behavior of leuco-fluorescein has been investigated to some extent in the presence of and in the absence of a reducing agent.Keywords
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