Abstract
AbstractCis‐transoidal poly(phenylacetylene)s bearing 15‐crown‐5 (2a) and 18‐crown‐6 (2b) were prepared by stereoselective polymerization using Rh(nbd)BPh4. In the circular dichroism (CD) spectrum of 2a in the presence of the perchloric acid salt of L‐phenylglycine (L‐Pgly· HClO4), a characteristic induced CD (ICD) was observed in the absorption range corresponding to the polymer backbone. On the contrary, the 2b/L‐Pgly · HClO4 system did not show such an ICD spectrum. The ICD intensity of the 2a/L‐Pgly · HClO4 system drastically depended on temperature, i.e., the ICD disappeared at 30 °C or higher. Thus, the on‐off switching of the ICD of 2a was controllable by either the temperature modulation or the doping/undoping process of the chiral guest.
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