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|Title:||Triplet state interaction of phenosafranine with inorganic cations|
|Authors:||Bhattacharya, Subhash Ch.|
Rohatgi-Mukherjee, K K
|Abstract:||The quenching of triplet state of phenosafranine (PSF) dye by Fe2+, Mn2+ and CO2+ has been studied at pH 4.5. The doubly protonated long-lived triplet species 3DH absorbs at 620 nm whereas the radical ion DH absorbs at 660 nm. First order decay kinetics are observed which appear to change to second order at later decay times in the quenching process. In the presence of low [quencher], the decay.-rate can be fitted to the first order kinetic expression. The interaction of 3PSF with the quencher ions generates reduced semi-dye by electron transfer-mechanism. The reduction of 3PSF by Mn2+and Fe2+ is thermodynamically allowed but electron transfer from CO2+ to 3PSF is endoergic. The mechanism of quenching by CO2+ can be visualised as complexation by charge transfer mechanism between 3PSF and CO2+ which can lead to enhancement of the spin forbidden radiationless processes.|
|Appears in Collections:||IJC-A Vol.30A(07) [July 1991]|
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