TY  - JOUR
A1  - Sartorius, Rolf
A1  - Schmidt, Reinhard
A1  - Kelm, Hartwig
A1  - Brauer, Hans-Dieter
T1  - Untersuchung der cis-trans-Isomerie des Wittigschen Kohlenwasserstoffs
T1  - Investigation of the cis-trans-isomerism of the Wittig hydrocarbon
T2  - Zeitschrift für Naturforschung, B
N2  - The cis-trans-isomerism of the WITTIG hydrocarbon was investigated in solid state and solution by means of fluorescence spectroscopy. The fluorescence behavior of both isomers in 2-methyltetrahydrofurane was determined as a function of concentration, temperature, and wavelength of exciting radiation. Furthermore, irradiation experiments were undertaken with light of various wavelengths.
The results obtained are in agreement with the assumption that the WITTIG hydrocarbon behaves with regard to the cis-trans-isomerism like a 1,3-butadien derivative, i.e. a thermal but no photochemical cis-trans-isomerisation can be detected. The enthalpy difference between the two isomers was estimated to ΔΗ = 250 ± 50 cal/mole. It could be shown that the fluorescence of the cis-isomer is quenched by the trans-isomer. This quenching occurs probably according to the resonance energy transfer mechanism.
Y1  - 2014
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/76165
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-761654
SN  - 1865-7117
SN  - 0932-0776
VL  - 31
IS  - 6
SP  - 810
EP  - 815
PB  - Verlag der Zeitschrift für Naturforschung
CY  - Tübingen
ER  -