Rotamerism and trans–cis photoisomerization of 1-(2-naphthyl)-2-(n′-pyridyl)ethylenes studied by stationary and pulsed fluorescence techniques
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 82 (5) , 775-788
- https://doi.org/10.1039/f29868200775
Abstract
A study of the fluorescence properties (spectra, quantum yields, decay curves) of trans-1-(2-naphthyl)-2-(n′-pyridyl)ethylenes as a function of the excitation wavelength and temperature has allowed the observation of a dynamic equilibrium between different conformers. The fluorimetric analysis put forward previously for a mixture of rotamers with isoemissive points has now been extended to systems without isoemissive points and successfully applied to derive the distinct kinetic parameters of 1-(2-naphthyl)-2-(3′-pyridyl)ethylene. For the ortho and paran-positional isomers, only the separate lifetimes and the enthalpy difference between the two rotamers have been evaluated. The properties of the systems studied have been compared to those of related hydrocarbons and discussed from the point of view of their implication in the trans–cis photoisomerization mechanism.Keywords
This publication has 0 references indexed in Scilit: