Ac. Benniston et al., PHOTOISOMERIZATION OF STERICALLY HINDERED MEROCYANINE DYES, Journal of the Chemical Society. Faraday transactions, 93(20), 1997, pp. 3653-3662
Citations number
39
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
A small series of merocyanine dyes has been synthesized in which subst
ituents are incorporated into the polymethine backbone. The substituen
t perturbs the local structure in the polyenic bridge, as evidenced by
changes to the bond order, the valence electronic charge on certain b
ridging carbon atoms, the bond length alternation, and the torsion ang
le. There are corresponding variations in the rates of internal conver
sion and reverse isomerization that permit identification of the doubl
e bond around which rotation occurs. A good correlation exists between
the rates of rotation and the torsion angle that permits a quantitati
ve description of the overall photophysical properties of these compou
nds in propan-1-ol at room temperature.