Chirality of aromatic bis-imides from their circular dichroism spectra
2000; Wiley; Volume: 12; Issue: 4 Linguagem: Inglês
10.1002/(sici)1520-636x(2000)12
ISSN1520-636X
AutoresJacek Gawro ski, M. Brzostowska, Karol Kacprzak, Halina Ko bon, Paweł Skowronek,
Tópico(s)Axial and Atropisomeric Chirality Synthesis
ResumoIt 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 1H NMR data. A comparison of chiroptical properties of bis-diimides 3–5 with the CD spectra of bis-imides 6–8 is also presented. Chirality 12:263–268, 2000. © 2000 Wiley-Liss, Inc.
Referência(s)