Rate constants for the exawd-slate protolyuc rcactmn of F-nophthylanune In alkalrne aqueous solu~ons have been delemuned usmg nanosecond pulse fluoromeuy. and the excited-slate pK has been derived from the rate cons~~~ls It 1s ancludd whet &naphthylamme follows a two-state reversible proton-uansfcr
Excited state proton transfer reactions of acridine studied by nanosecond fluorometry
β Scribed by Ari Gafni; Ludwig Brand
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 430 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Rate constants far excited st3tt-z prctcirmtion reactian of acritie fn aqueou3 solntiotl have been determhd using fiuo-resc~ce deciy measmrcments. The x&u+ of the excited strite pEC derived from the rate constants is in f&l agreement wifh the one obtained from steady state fluoresctx~ce measurements. ft is condslded #at acridme follows a two states ma&ion scheme in its ekctronical!y excite& state.
π SIMILAR VOLUMES
Time-resolved and steadystate fluorescence studlcs of proflavine in aqueous solutton are presented. The obsenauon of a monoexponentlal fluorescence decay wth a time constant decreasmg wth tnaeasing pH and the presence of an anomalous redjhift m the fluorescence spectrum as a function of pH indwate t
In~mol~~ 2pn\* + 3dn charge transfer in the excited state of phenyl~e occurs very rapidly (<IO ps) both in ?&Fat 293 K and in EPA glass at 77 K. At room temperature a Iong;lived 425 nm transient (which is assgned to a reananged intermediate) is produced with a nse time of 30 ps, showing that the tra