✦ LIBER ✦

Time-resolved and steady-state fluorescence studies of excited-state proton-transfer reactions of proflavine

✍ Scribed by S. De Silvestri; P. Laporta

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 462 KB
Volume: 103
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(84)80006-8

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✦ Synopsis

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 the eustence of a complex proton-transfer mechamsm in the evated state. A reaction scheme IF, proposed and the wrrespondmg proton-transfer rates are eraluated. An e\cltedstate pK value of 12.85 1s obtained for the equtibnum between the utionic form of pro&vine and the same form &ssociated at an ammo group.

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