Ramaraj, R. ; Tamilarasan, R. ; Natarajan, P. (1985) Luminescence quenching and flash photolysis studies of acrylamidomethylthionine copolymers Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 81 (11). pp. 2763-2773. ISSN 0956-5000
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Official URL: http://pubs.rsc.org/en/content/articlelanding/1985...
Related URL: http://dx.doi.org/10.1039/F19858102763
Abstract
Thionine, attached to the macromolecules poly(acrylamide) and its copolymer with vinyl-pyridine, shows emission with a maximum around 640 nm. The observed fluorescence from the polymer-dye excited state is quenched by ferrous and ferric ions in aqueous solutions, with a diffusionally limited bimolecular quenching constant. Flash photolysis of the polymer-thionine complexes in the presence of ferrous ions shows adduct formation between the polymer-bound thionines and iron; the polymeric semithionine dissociated from this complex disproportionates. The rate constant for the disproportionation process of the polymer-semithionine radical is two orders of magnitude lower than that for the monomeric semithionine. The disproportionation reaction is found to occur between the semithionines bound to the same polymer chains.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Royal Society of Chemistry. |
| ID Code: | 77729 |
| Deposited On: | 14 Jan 2012 12:43 |
| Last Modified: | 14 Jan 2012 12:43 |
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