Chirality of aromatic bis-imides from their circular dichroism spectra
- 28 April 2000
- Vol. 12 (4) , 263-268
- https://doi.org/10.1002/(sici)1520-636x(2000)12:4<263::aid-chir12>3.0.co;2-9
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 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.Keywords
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