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Crystal structures of 2∶1 inclusion complexes of xylidine isomers with 1,1,6,6tetraphenylhexa2,4diyne1,6diol: the importance of weak intermolecular interactions in crystal stability |
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CrystEngComm,
Volume 3,
Issue 7,
2000,
Page 30-32
Shinji Toyota,
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摘要:
IntroductionThe diacetylenediol1has been extensively used as an excellent host molecule in host–guest chemistry because of its facile formation of stable inclusion complexes with various kinds of guest molecules.1Because the ease of crystallization of its inclusion complexes is delicately influenced by the structure of the guest molecules, this host allows us to separate a single isomer from a mixture of multiple isomers by preferential crystallization. Isomers of picolines (methylpyridines)2and lutidines (dimethylpyridines)3were successfully separated by this method using host1, although the separation by other ordinary methods was far from practical. During the application of this method to the separation of xylidine (dimethylaniline) isomers (2), we were able to obtain Xray structures of the inclusion complexes of the three isomers. The systematic analyses of these data reveal that weak intermolecular interactions such as X–H⋯Y (X, Y⊕=⊕N or O), C–H⋯π and π⋯π interactions play an important role in the stability of the inclusion complexes as often claimed in the crystal engineering.4–7We report here the relationship between crystal stability and structure in the inclusion complexes based on Xray analysis.
ISSN:1466-8033
DOI:10.1039/b009083m
出版商:RSC
年代:2000
数据来源: RSC
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