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首页> 外文期刊>Crystal growth & design >Polymorphism in cis-trans Muconic Acid Crystals and the Role of C-H center dot center dot center dot O Hydrogen Bonds
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Polymorphism in cis-trans Muconic Acid Crystals and the Role of C-H center dot center dot center dot O Hydrogen Bonds

机译:CIS-转杂岩酸晶体中的多态性及C-H中心点中心点中心点O氢键的作用

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摘要

Cis-trans isomerization of muconic acid is an important component of various chemical syntheses. Despite the existence of three geometric muconic acid isomers, little atomically precise information is actually known of their structures. In this work, the complete crystal structures of cis-cis, cis-trans, and trans trans muconic acid were determined via single-crystal X-ray diffraction and then further analyzed using terahertz vibrational spectroscopy and solid-state density functional theory. In addition to being the first reported crystal structure for cis trans muconic acid, two polymorphs of this species were discovered, with one exhibiting a two-dimensional hydrogen-bonding pattern stabilized through C-H center dot center dot center dot O interactions. Terahertz spectroscopy aided in polymorph characterization and also provided clear evidence of a hydrated crystalline species that grows only from one of the cis-trans muconic acid polymorphs. Ab initio simulations showed that while the typical end-to-end hydrogen-bonding motif found in dicarboxylic acid crystals dominates at room temperature for cis-trans muconic acid, the two-dimensional hydrogen-bonding network with C-H center dot center dot center dot O hydrogen bonding is energetically favored at very low temperatures.
机译:粘液酸的顺式 - 反式异构化是各种化学合成的重要组成部分。尽管存在三个几何粘液异构体,但实际上已知其结构的小原子精确信息。在这项工作中,通过单晶X射线衍射测定CIS-CIS,CIS-Trans和反式反式粘液酸的完全晶体结构,然后使用太赫兹振动光谱和固态密度函数理论进行进一步分析。除了作为顺式反式粘液酸的第一个报告的晶体结构之外,还发现了该物种的两种多晶型物,其中一个呈现通过C-H中心点中心点中心点O相互作用稳定的二维氢键合图案。 Terahertz光谱辅助多晶型特征,并且还提供了仅由CIS-Trans粘液酸多晶型物中的一种生长的水合结晶物质的清晰证据。 AB Initio模拟表明,虽然在二羧酸晶体中发现的典型端到端氢键基序列,其在室温下为顺式 - 反式粘液酸,二维氢键网络与CH中心点中心点中心点O.氢键在非常低的温度下能够充满活力。

著录项

  • 来源
    《Crystal growth & design》 |2017年第8期|共9页
  • 作者单位

    Syracuse Univ Dept Chem 1-014 Ctr Sci &

    Technol Syracuse NY 13244 USA;

    Syracuse Univ Dept Chem 1-014 Ctr Sci &

    Technol Syracuse NY 13244 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
  • 关键词

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