Hemicyanine dye structure is modified with a C16‐alkyl chain to amino‐head and a C1, C8 or C16 alkyl to pyridinium‐tail. Spectral properties of the dyes in supramolecular inclusion complexation with amylose are studied in order to assess the mono‐functional polarity sensing activity of the pyridinium cations in DMSO‐H2O mixtures. Inclusion complexation brings the γmax of C16DASPC1 dye to a blue‐shift (relative to that of the free dye state) while that of C16DASP(C8 and C16) dyes remains almost unchanged.
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Heuer et al. (1999) studied this question.
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