Seed-triggered solid-to-solid transformation between color polymorphs: striking differences between quasi-isomorphous crystals of dichloro-substituted salicylideneaniline regioisomers,CrystEngComm

当前位置： X-MOL 学术 › CrystEngComm › 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.)

Seed-triggered solid-to-solid transformation between color polymorphs: striking differences between quasi-isomorphous crystals of dichloro-substituted salicylideneaniline regioisomers
CrystEngComm ( IF 2.6 ) Pub Date : 2020-07-03 , DOI: 10.1039/d0ce00679c
Zaixiang Zhang _{1,

2,

3,

4,

5} , Masahiro Suzuki _{6,

7,

8,

9} , Yu Yang _{6,

7,

8,

9} , Isao Yoshikawa _{6,

7,

8,

9} , Qiuxiang Yin _{1,

2,

3,

4,

5} , Hirohiko Houjou _{6,

7,

8,

9}

Affiliation

Two regioisomers, N-(4′-chlorosalicylidene)-4-chloroaniline (4CC) and N-(5′-chlorosalicylidene)-4-chloroaniline (5CC), were prepared and were found to exhibit color polymorphism with yellow and orange forms. Microscopy observations revealed that only 4CC exhibited a solid-to-solid transition from the yellow to orange form during heating, and that contact with orange seed crystals could trigger the transformation. The transformation was tracked by thermal analysis and variable-temperature infrared spectroscopy. When polymorphs of the same color were compared, the 4CC and 5CC crystal structures were similar, whereas the molecular arrangement of 4CC crystals was significantly disordered with respect to the molecular orientation. Assuming that the disorder results from stacking faults, crystal models were constructed free of disorder and their molecular environment was analyzed in detail. Finally, it was proposed that certain types of stacking faults could have promoted the solid-to-solid transition.

中文翻译：

种子触发的多晶型物之间的固-固转变：二氯取代的水杨基亚胺苯胺区域异构体的准同晶之间的显着差异

两种区域异构体，N-（4'-chlorosalicylidene）-4-chloroaniline（4CC）和N制备了-（5'-氯水杨基）-4-氯苯胺（5CC），发现其具有黄色和橙色形式的颜色多态性。显微镜观察发现，在加热过程中，只有4CC表现出从黄色到橙色形式的固体到固体的转变，并且与橙色晶种的接触可以触发转变。通过热分析和可变温度红外光谱跟踪该转变。当比较相同颜色的多晶型物时，4CC和5CC晶体结构相似，而4CC晶体的分子排列在分子取向方面却明显混乱。假设无序是由堆垛层错引起的，则可以构建无序的晶体模型，并详细分析其分子环境。最后，

更新日期：2020-07-27

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