Proton-transfer reactions in the excited state of phenanthrylamines by nanosecond spectroscopy and fluorimetry
- 1 January 1982
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 78 (4) , 1087-1101
- https://doi.org/10.1039/f19827801087
Abstract
Proton-transfer reactions in the excited singlet state of phenanthrylamines at 300 K have been studied by means of nanosecond time-resolved spectroscopy and fluorimetry. On the basis of dynamic analyses involving proton-induced fluorescence quenching, the proton dissociation (k1) and association (k2) rate constants and the acidity constants pK* a in the excited singlet state of phenanthrylamines were determined. The pK* a values are discussed theoretically by taking account of their electronic structures. An empirical equation to estimate approximately the correct pK* a values of aromatic amines using data from Stokes shifts and (pK* a)FC values (determined by the Förster cycle) is proposed. Isotope effects on the rate constants and pK* a values have also been examined.Keywords
This publication has 0 references indexed in Scilit: