Collimating the growth of twisted crystals of achiral compounds
Collimating the growth of twisted crystals of achiral compounds
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DOI：
10.1002/chir.23558
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发表时间：
2023-03-18
期刊：
影响因子：
2
通讯作者：
Lee, Stephanie S.
中科院分区：
文献类型：
--
作者：
Lozano, Idalys;Whittaker, St. John;Lee, Stephanie S.
很大一部分分子晶体可以以扭曲原纤维的形式生长。通常，这需要高结晶驱动力才能产生球晶结构。在这里，展示了由聚（二甲基硅氧烷）（PDMS）制成的微米尺寸通道如何用于准直三种化合物（香豆素、2,5-双（3-十二烷基-2-噻吩基）-噻唑并[5,4-d]噻唑和四硫富瓦烯）扭曲晶体的光学带状球晶的圆形多晶生长前沿。测量了螺旋螺距、生长前沿相干性和通道宽度之间的关系。当通道溢出到开放空间时，准直晶体通过小角度分支“衍射”。另一方面，从带异相的单独通道生长在一起的晶体最终通过未知的协作机制变成单个同相原纤维束。描述了各个通道中单个扭转感测的隔离。我们预测这种手性分子晶体通道可能充当手性光波导。
A great proportion of molecular crystals can be made to grow as twisted fibrils. Typically, this requires high crystallization driving forces that lead to spherulitic textures. Here, it is shown how micron size channels fabricated from poly(dimethylsiloxane) (PDMS) serve to collimate the circular polycrystalline growth fronts of optically banded spherulites of twisted crystals of three compounds, coumarin, 2,5-bis(3-dodecyl-2-thienyl)-thiazolo[5,4-d]thiazole, and tetrathiafulvalene. The relationships between helicoidal pitch, growth front coherence, and channel width are measured. As channels spill into open spaces, collimated crystals "diffract" via small angle branching. On the other hand, crystals grown together from separate channels whose bands are out of phase ultimately become a single in-phase bundle of fibrils by a cooperative mechanism yet unknown. The isolation of a single twist sense in individual channels is described. We forecast that such chiral molecular crystalline channels may function as chiral optical wave guides.