M. Ravi et al., EXCITED-STATE DIPOLE-MOMENTS OF SOME COUMARIN DYES FROM A SOLVATOCHROMIC METHOD USING THE SOLVENT POLARITY PARAMETER, E(N)(T), Journal of the Chemical Society. Faraday transactions, 91(17), 1995, pp. 2739-2742
Citations number
13
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Excited-state dipole moments of a set of Coumarin dyes extensively use
d in laser applications have been determined for the first time, emplo
ying a solvatochromic procedure utilising the microscopic solvent pola
rity parameter, E(T)(N). Our results are expected to be quite reliable
in view of the fact that the correlation of the solvatochromic Stokes
shifts is superior to that obtained using bulk solvent polarity funct
ions. The experimentally determined dipole-moment changes are in fair
agreement with recent semi-empirical computational predictions. It is
shown that the discrepancies observed in some cases can be overcome us
ing more appropriate parametrisation in the calculation. The insight p
rovided by the present measurements into the nature of the emitting st
ate is mentioned.