Abstract
The emission anisotropy r of rhodamine B chemically bound to the terminal amino group of poly(γ-benzyl L-glutamate) (PBLG) was measured in a series of chloroform–dichloroacetic acid mixtures at room temperature. The value of r for the chromophore bound to PBLG differs appreciably from that for a free chromophore in chloroform a helix forming solvent for PBLG, but the values are similar to each other in dichloroacetic acid, a helix breaking solvent. The change in the rotational relaxation in the neighborhood of terminal group of PBLG with solvent composition does not parallel the content of a helix measured by ORD but shows two sharp increases at 0—10% and 60—75% dichloroacetic acid. The implication of these results is briefly discussed.
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Ushiki, H., Mita, I. Helix–Coil Transition Behavior of Terminal Group of Poly(γ-benzyl L-glutamate) Studied by Depolarization of Fluorescence. Polym J 13, 837–844 (1981). https://doi.org/10.1295/polymj.13.837
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DOI: https://doi.org/10.1295/polymj.13.837