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- Publisher
- Springer Journals
- Copyright
- Copyright © 2000 by VSP
- Subject
- Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
- ISSN
- 0922-6168
- eISSN
- 1568-5675
- DOI
- 10.1163/156856700X00453
- Publisher site
- See Article on Publisher Site
Abstract
The phenyl substituted acridine-1,8-dione (AD) dye reacts with (CH3)2*COH radicals with a bimolecular rate constant of 0.6 × 108 dm3 mol−1 s−1 in acidic aqueous-organic mixed solvent system. The transient optical absorption band (λmax = 465 nm, ɛ = 6.8 × 102 dm3 mol−1 cm−1) is assigned to ADH* formed on protonation of the radical anion. In basic solutions, (CH3)2*COH radicals react with a bimolecular rate constant of 4.6 × 108 dm3 mol−1 s−1 and the transient optical absorption band (λmax = 490 nm, ɛ = 10.4 × 103 dm3 mol−1 cm−1) is assigned to radical anion, AD*−, which has a pKa value of 8.0. The reduction potential value of the AD/AD*− couple is estimated to be between −0.99 and −1.15 V vs NHE by pulse radiolysis studies. The cyclic voltammetric studies showed the peak potential close to −1.2 V vs Ag/AgCl.
Journal
Research on Chemical Intermediates – Springer Journals
Published: Jan 1, 2000