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Hydrate Transformation via Anhydrate Pairs
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-07-31 , DOI: 10.1021/acs.cgd.0c00655
Alyssa M. Thornton 1 , Victoria M. Hall 1 , Jennifer A. Swift 1
Affiliation  

Here we present an example of an unusual hydrate–anhydrate transformation process induced by defects. Crystallization of uric acid in the presence of substoichiometric concentrations of 2,4-diaminopyrimidine (24-DAP) additives results in uric acid dihydrate (UAD) prisms with trace amounts of 24-DAP included. Prisms maintained in the growth solution transform to anhydrous uric acid (UA) via a highly unusual mechanism in which pairs of thin UA plates emerge from the center of the UAD prism faces which bisect the ± a-axis. With continued growth over several days, the UA pairs eventually fuse together with complete consumption of the initial UAD crystal. A battery of analytical methods are employed in an effort to better understand the complicated role of 24-DAP in the transformation process.

中文翻译:

通过无水物对进行水合物转化

在这里,我们提供了一个由缺陷引起的异常的水合转变过程的示例。在亚化学计量浓度的2,4-二氨基嘧啶(24-DAP)添加剂存在下,尿酸的结晶会导致尿酸二水合物(UAD)棱镜,其中包含痕量的24-DAP。生长溶液中保持的棱镜通过一种非常不寻常的机制转变为无水尿酸(UA),在这种机制中,成对的薄UA板从UAD棱柱面的中心(将± a分为二)出现。随着几天的持续增长,UA对最终融合在一起,并完全消耗了最初的UAD晶体。为了更好地理解24-DAP在转化过程中的复杂作用,采用了一系列分析方法。
更新日期:2020-09-02
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