TY - JOUR
T1 - Photophysical characterization of trans-4,4′-disubstituted stilbenes
AU - Papper, Vladislav
AU - Pines, Dina
AU - Likhtenshtein, Gertz
AU - Pines, Ehud
PY - 1997/1/1
Y1 - 1997/1/1
N2 - Absorption and emission spectra of twenty trans-4,4′-disubstituted stilbenes have been measured in four solvents: cyclohexane (CH), chlorobenzene (CB), 2-butanone (methylethyl ketone, MEK) and dimethylsulfoxide (DMSO) at room temperature. Fluorescence quantum yields (Φf) and fluorescence lifetimes (τf) have been measured for these stilbenes. The lifetimes and quantum yields of fluorescence were found to be dependent on the donor-acceptor properties of the substituents and correlate with the Hammett σ-constants. In addition, we experimentally observed the appearance of a second emitting state which is close energetically to the lowest exited singlet state 1t* in cases of strong donor-acceptor substituents in polar solvents.
AB - Absorption and emission spectra of twenty trans-4,4′-disubstituted stilbenes have been measured in four solvents: cyclohexane (CH), chlorobenzene (CB), 2-butanone (methylethyl ketone, MEK) and dimethylsulfoxide (DMSO) at room temperature. Fluorescence quantum yields (Φf) and fluorescence lifetimes (τf) have been measured for these stilbenes. The lifetimes and quantum yields of fluorescence were found to be dependent on the donor-acceptor properties of the substituents and correlate with the Hammett σ-constants. In addition, we experimentally observed the appearance of a second emitting state which is close energetically to the lowest exited singlet state 1t* in cases of strong donor-acceptor substituents in polar solvents.
KW - Fluorescence lifetimes
KW - Fluorescence quantum yields
KW - Photophysical characterization
KW - Trans-4,4′-disubstituted stilbenes
UR - http://www.scopus.com/inward/record.url?scp=0031537220&partnerID=8YFLogxK
U2 - 10.1016/S1010-6030(97)00234-7
DO - 10.1016/S1010-6030(97)00234-7
M3 - Article
AN - SCOPUS:0031537220
VL - 111
SP - 87
EP - 96
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
IS - 1-3
ER -