Pronounced effects on switching efficiency of diarylcycloalkenes upon cycloalkene ring contraction.
Several difurylperfluorocyclobutenes showing reversible photochromism were synthesized. In comparison to their cyclopentene homologues they show enhanced quantum yields for ring opening but reduced quantum yields for ring closure. X-ray structure analysis and quantum chemical calculations provide a conclusive explanation for such a behaviour.
Fachbereich Chemie, Universität Konstanz, D-78457 Konstanz, Germany.
Dmytro
D
Sysoiev
Tetyana
T
Yushchenko
Elke
E
Scheer
Ulrich
U
Groth
Ulrich E
UE
Steiner
Thomas E
TE
Exner
Thomas
T
Huhn