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Induced optical activity in the complex of poly(L-arginine) with azo dyes

✍ Scribed by Hiroyuki Yamamoto; Ayako Nakazawa

Publisher: Wiley (John Wiley & Sons)
Year: 1984
Tongue: English
Weight: 422 KB
Volume: 23
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360230719

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✦ Synopsis

The absorption and CD spectra of the complexes of poly(L-arginine) (PLA) and azo dyes have been measured in aqueous solution. On complexation, blue-shifted additional absorption bands were observed. In the wide pH 4-11 range, induced CD was observed at the visible wavelengths corresponding to the blue-shifted absorption bands. The induced CD arose from the dimeric dye molecules bound to PLA in the a-helical structure. When a modified analysis of induced CD is made by the exciton chirality method, the origin of the induced CD can be assigned to the dipole coupling. The PLA-dye complexes showed the counterclockwise (negative, S ) chirality of the transition dipole moments of dyes.

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