title: An experimental test of C-N bond twisting in the TICT state: syn-anti photoisomerization in 2-(N-methyl-N-isopropylamino)-5-cyanopyridine.
abstract: A previously untested essential consequence of the "TICT" (twisted internal charge transfer) interpretation of the nature of the "anomalous" excited state of p-dimethylaminobenzonitrile (1) and related compounds has now been verified: at -90 degreesC, the dual fluorescence of a desymmetrized analogue, 2-(N-methyl-N-isopropylamino)-5-cyanopyridine (2), in methanol (MeOH) is accompanied by syn-anti isomerization around the C-N bond, whereas its ordinary fluorescence in tetrahydrofuran is not.
authors.affiliation: Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland.
authors.forename: Jacek
authors.initials: J
authors.lastname: Dobkowski
authors.forename: Jacek
authors.initials: J
authors.lastname: Wójcik
authors.forename: Witold
authors.initials: W
authors.lastname: Koźmiński
authors.forename: Robert
authors.initials: R
authors.lastname: Kołos
authors.forename: Jacek
authors.initials: J
authors.lastname: Waluk
authors.forename: Josef
authors.initials: J
authors.lastname: Michl