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Induced optical activity in the complex of poly( L ‐arginine) with azo dyes
Author(s) -
Yamamoto Hiroyuki,
Nakazawa Ayako
Publication year - 1984
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360230719
Subject(s) - chemistry , chirality (physics) , absorption (acoustics) , blueshift , aqueous solution , dipole , photochemistry , absorption spectroscopy , molecule , crystallography , stereochemistry , organic chemistry , photoluminescence , optics , physics , chiral symmetry breaking , quantum mechanics , nambu–jona lasinio model , quark
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 α‐helical structure. When a modified analysis of induced CE is made by the excition chirality method, the origin of the induced CD can be assigned to the dipole coupling. The PLA–dye complexes showed the counterlockwise (negative, S ) chirality of the transition dipole moments of dyes.