Article

On the electronic structure of exciplexes in α-(1- OR 2-naphthyl)-ω-N,N-dialkylaminoalkanes

Laboratorium voor Macromoleculaire en Organische Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, B-3030 Heverlee-Leuven Belgium
Journal of Photochemistry DOI:10.1016/0047-2670(85)85035-8 pp.315-327

ABSTRACT In this paper the theoretical model for the electronic structure of an exciplex with aromatic donors and acceptors, developed by Weller and modified for intramolecular exciplexes in which a parasubstituted phenyl acts as acceptor and an aliphatic amine as donor, is applied to compounds of type I: This model allows the exciplex geometry to be estimated and values for the emission maximum and the fluorescence rate constant which approach the experimental observed values of these quantities within the experimental error to be determined. The influence of the solvent polarity can also be mimicked. These data show a substantial difference between 1-dimethyl-amino)-2-(1-naphthyl)ethane (1N2NM) and 1-(dimethylamine)-2-(2-naphthyl)-ethane (2N2NM) as to the nature of the excited state exciplex in solvents of low polarity.

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Keywords

1-(dimethylamine)-2-(2-naphthyl)-ethane
 
acceptors
 
aliphatic amine
 
compounds
 
electronic structure
 
exciplex geometry
 
excited state exciplex
 
experimental error
 
fluorescence rate constant
 
intramolecular exciplexes
 
parasubstituted phenyl acts
 
substantial difference