Factors controlling the deactivation induced by hydrogen-bonding interaction: Steric and electronic effects on dual anisotropic relaxation processes

Citation
M. Sugita et al., Factors controlling the deactivation induced by hydrogen-bonding interaction: Steric and electronic effects on dual anisotropic relaxation processes, PHYS CHEM P, 3(11), 2001, pp. 2012-2017
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN journal
1463-9076 → ACNP
Volume
3
Issue
11
Year of publication
2001
Pages
2012 - 2017
Database
ISI
SICI code
1463-9076(2001)3:11<2012:FCTDIB>2.0.ZU;2-U
Abstract
The factors controlling deactivation from the intramolecular charge transfe r excited states of aminoanthraquinones and aminofluorenones induced throug h intermolecular hydrogen-bonding interactions with alcohols such as p-subs tituted benzyl alcohols and bulky alcohols were investigated by steady-stat e and time-resolved fluorescence spectroscopy. The ratios of the Stern-Volm er constants for the fluorescence quenching by the alcohols to the contact molecular surface area of the hydroxy hydrogen were correlated well with th e charge density of the hydroxy hydrogen of the alcohols. The rate constant of the forward process which forms a relaxed hydrogen-bonded complex in th e excited state was revealed to depend on the contact molecular surface are a of the hydroxy hydrogen, whereas the reverse process was mainly controlle d by electronic effects which stabilize the relaxed hydrogen-bonded complex .