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Chirality of aromatic bis-imides from their circular dichroism spectra

✍ Scribed by Jacek Gawroński; Małgorzata Brzostowska; Karol Kacprzak; Halina Kołbon; Paweł Skowronek

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 172 KB
Volume: 12
Category: Article
ISSN: 0899-0042
DOI: 10.1002/(sici)1520-636x(2000)12:4<263::aid-chir12>3.0.co;2-9

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✦ Synopsis

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.

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