title: Chirality of aromatic bis-imides from their circular dichroism spectra
abstract: It is demonstrated that chirality of molecules composed of 1,2,4, 5-benzenetetracarboxydiimide (pyromellitic diimide) or 1,4,5, 8-naphthalenetetracarboxydiimide units is reflected by their exciton Cotton effects. The analysis is based on the calculated (ZINDO/S) excited states of the model diimide chromophores 1a and 2a. Rotation of the diimide chromophores around the C-N bond in diimides 3-5 is evaluated from the dynamic (1)H NMR data. A comparison of chiroptical properties of bis-diimides 3-5 with the CD spectra of bis-imides 6-8 is also presented. Copyright 2000 Wiley-Liss, Inc.
authors.affiliation: Department of Chemistry, A. Mickiewicz University, 60780 Poznan, Poland.
authors.initials: J
authors.lastname: Gawronski
authors.initials: M
authors.lastname: Brzostowska
authors.initials: K
authors.lastname: Kacprzak
authors.initials: H
authors.lastname: Kolbon
authors.initials: P
authors.lastname: Skowronek