The solvent- and temperature-driven high-/low-twist switch of the biphenyl moieties in a poly(biphenylacetylene) with hydroxyl groups [poly(BPhDHPA)] triggered the rapid helix inversion of the induced helices in poly(BPhDHPA) by a single enantiomer, and the induced helices under both high-twist and low-twist modes could be well memorized using achiral phenylmethanol. The addition of a small amount of polar solvent [e.g., dimethyl formamide (DMF), <10 vol %] to a toluene solution of l-menthol/poly(BPhDHPA) complex causes an immediate and complete inversion of the induced helices. Further analysis indicates that the biphenyl moieties in the complex take the high-twist structure in nonpolar solvents and low-twist structure in polar solvents. The helices induced under the high-twist mode in nonpolar solvents showed higher thermostability than helices induced under the low-twist mode in polar solvents. The chiral amplification following the “majority rule” under the low-twist mode is more efficient than that under the high-twist mode.

中文翻译：

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单一对映异构体诱导的具有羟基的聚联二苯乙炔的螺旋手性反转和螺旋的记忆

联苯部分的在聚（biphenylacetylene）与羟基的溶剂和温度驱动的高/低捻开关[聚（BPhDHPA）]引发聚（感应螺旋的快速螺旋反转BPhDHPA由单个）对映体，以及在高扭转和低扭转模式下诱导的螺旋都可以使用非手性苯基甲醇很好地记忆。向1-薄荷醇/聚（BPhDHPA）的甲苯溶液中添加少量极性溶剂[例如，二甲基甲酰胺（DMF），<10 vol％]）复杂会导致感应螺旋立即完全反转。进一步的分析表明，配合物中的联苯部分在非极性溶剂中呈高扭曲结构，在极性溶剂中呈低扭曲结构。在非极性溶剂中以高扭曲模式诱导的螺旋比在极性溶剂中以低扭曲模式诱导的螺旋显示更高的热稳定性。在低扭转模式下遵循“多数规则”的手性放大比在高扭转模式下进行的手性放大更为有效。