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The orientation of naphthalene rings in the side chain of poly‐γ‐1‐naphthylmethyl‐ L ‐glutamate (PNLG) in mixed solvents of dichoroethane (DCE) and hexafluoroisopropanol (HFIP) has been studied together with its conformation by infrared, circular dichroism, and fluorescence spectra. The CD pattern of PNLG varies with the solvent composition while it maintains the α‐helical conformation. The fluorescence spectra of PNLG in solution show excimer emission of the naphthalene chromophores. The ratio of intensity of the excimer emission to that of the normal fluorescence decreases as the HFIP component in the solvent increases. It is suggested that the naphthalene rings in the side chain of α‐helical PNLG are more rigidly orientated in the solvents of higher HFIP ratio.
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Ueno et al. (1974) studied this question.
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