Abstract
AbstractCis–transoidal poly[(4‐carboxyphenyl)acetylene] (poly‐1) complexed with optically active amines and amino alcohols showed an induced circular dichroism (ICD) in the ultraviolet–visible region because of a predominantly one‐handed helix formation in water and in dimethyl sulfoxide (DMSO). The Cotton effect signs of the poly‐1/chiral amino alcohol complexes were inverted in the presence of water, whereas the ICD pattern of the poly‐1/chiral amine complexes showed no change, regardless of the water content. These results demonstrated that the helix sense of poly‐1 induced by optically active amino alcohols through noncovalent acid–base interactions could be switched by changes in the solvent ratio in the DMSO–water mixtures. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3625–3631, 2003
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