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首页> 外文期刊>Crystal growth & design >Using programmed heating-cooling cycles with racemization in solution for complete symmetry breaking of a conglomerate forming system
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Using programmed heating-cooling cycles with racemization in solution for complete symmetry breaking of a conglomerate forming system

机译：在溶液中使用程序化的加热-冷却循环和消旋化作用，以完全破碎砾岩形成系统

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摘要

A deracemization technique using periodic temperature fluctuations on a conglomerate forming system undergoing a swift racemization in solution is demonstrated. The method uses heating and cooling periods of the suspension in order to create cycles of partial dissolution of the crystal phase followed by crystal regrowth: this enables symmetry breaking in the solid phase. The technique is an effective, simple, and cheap operation, and can promote understanding of the effects of dissolution and recrystallization on chiral symmetry breaking in the solid phase. The heating period leads to the decrease of the size of crystals and the destruction of small crystals; the surviving crystals can then grow during the cooling period. A succession of such cycles allows the autocatalytic transformation from a racemic suspension into pure enantiomer, with an enantiomeric excess (ee) > 99% within a few days. The results demonstrate a possible mechanism for the emergence of homochirality of molecules of biological significance on Earth.
机译：对在溶液中经历快速消旋的团聚体形成系统中使用周期性温度波动的脱硫技术进行了演示。该方法利用了悬浮液的加热和冷却时间，以形成部分结晶相溶解和随后的晶体再生的循环：这使得固相中的对称性破裂成为可能。该技术是一种有效，简单且廉价的操作，并且可以增进对溶解和重结晶对固相中手性对称性断裂的影响的理解。加热时间导致晶体尺寸减小和小晶体破坏。幸存的晶体然后可以在冷却期间生长。这种循环的连续允许几天内对映体过量（ee）> 99％，从外消旋悬浮液自动催化转变为纯对映体。结果证明了在地球上出现具有生物学意义的分子的同质性的可能机制。

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