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Induced optical activity in poly‐ L ‐lysine–methyl orange system
Author(s) -
Hatano M.,
Yoneyama M.,
Sato Y.,
Kawamura Y.
Publication year - 1973
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.1973.360121019
Subject(s) - chemistry , circular dichroism , dimer , random coil , molecule , crystallography , absorption (acoustics) , wavelength , methyl orange , absorption band , magnetic circular dichroism , absorption spectroscopy , spectral line , photochemistry , optics , physics , organic chemistry , photocatalysis , astronomy , catalysis
The absorption and cicular dichroism spectra of the complex of poly‐ L ‐lysine (PLL) in the random coil form with methyl orange (MO) have been measured in aqueous solution. A new absorption band is observed at the shorter wavelength compared with that of the free dye. Although MO does not show a formation of dimer or aggregation with an increase in concentration, circular dichroism bands are observed at the wavelength corresponding to the wavelength of the new absorption band. These induced circular dichroism bands may arise from the dimeric MO molecules bound to PLL in the random coil form. The main contribution to the interaction between MO molecules is shown to be the electro static interaction. The observed circular dichroism spectra and the configuration of dimeric MO molecules bound to PLL can be explained by the dipole couping mechanism.