Vase-like β-Polymorph Guanine Crystal Aggregates Formed at the Air–Water Interface,ACS Materials Letters

当前位置： X-MOL 学术 › ACS Mater. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Vase-like β-Polymorph Guanine Crystal Aggregates Formed at the Air–Water Interface
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-03-24 , DOI: 10.1021/acsmaterialslett.9b00447
Nina K. Wittig ₁ , Thorbjørn E. K. Christensen ₁ , Tilman A. Grünewald ₂ , Henrik Birkedal ₁

Affiliation

Guanine in the anhydrous β-form is a common light manipulator in organisms to produce structural colors for a variety of purposes. The level of control over crystal nucleation and growth of guanine exhibited by these organisms to produce crystals with precise morphology, size, and polymorphism far surpasses what has so far been achieved synthetically from aqueous solution. Here, we show that the morphology of guanine crystals can be altered significantly by inducing crystallization at the air–water interface to produce vase-like morphologies with a few hundred nanometers thick, micron-longcrystals pointing away from the vase opening. The exact morphology is highly dependent on the initial guanine concentration with increasing templating efficiency from the air–water interface at decreasing sample volumes. Scanning nanobeam X-ray diffraction experiments reveal that the vases consist exclusively of the anhydrous β-polymorph and that the crystal long axes coincide with a*. While the morphology does not match the biogenic counterparts that usually are thin along a*, the results demonstrate that interfacial crystallization templates the aggregate morphology and dictates the polymorph of guanine.

中文翻译：

在水-空气界面形成的花瓶状β-多态鸟嘌呤晶体聚集体

无水β形式的鸟嘌呤是有机体中常见的光操纵剂，可产生多种用途的结构色。这些生物体对产生具有精确形态，大小和多态性晶体的晶体所表现出的对鸟嘌呤晶体成核和生长的控制水平远远超过了迄今为止从水溶液合成获得的水平。在这里，我们表明鸟嘌呤晶体的形态可以通过在空气-水界面处诱导结晶以产生花瓶状形态，从花瓶开口指向数百纳米厚，微米长的晶体而显着改变。确切的形态高度依赖于鸟嘌呤的初始浓度，并且随着样品体积的减小，空气-水界面的模板效率不断提高。a *。虽然形态与通常沿a *稀薄的生物对应物不匹配，但结果表明界面结晶模板具有聚集形态并决定了鸟嘌呤的多态性。

更新日期：2020-03-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11