Hydrogen-bonding patterns in a series of multi-component molecular solids formed by 2,3,5,6-tetramethylpyrazine with selected carboxylic acids
Hydrogen-bonding patterns in a series of multi-component molecular solids formed by 2,3,5,6-tetramethylpyrazine with selected carboxylic acids
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2,3,5,6-四甲基吡嗪与选定的羧酸形成的一系列多组分分子固体中的氢键模式
DOI：
10.1039/c4ce00749b
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发表时间：
2014
期刊：
影响因子：
3.1
通讯作者：
Huang Keke
中科院分区：
文献类型：
--
作者：
Wang Lei;Xue Ruiyu;Li Yuanxin;Zhao Yiran;Liu Faqian;Huang Keke
分析由 2,3,5,6-四甲基吡嗪与不同酸配体、1,4-环己烷二甲酸、2,6-二羟基苯甲酸、2,6-吡啶二甲酸、6-羟基-2-萘甲酸、3-硝基邻苯二甲酸、 介绍了邻苯二甲酸和 3-羟基苯甲酸，并得到单晶 X 射线衍射分析的支持。结果表明，除了2种以外，所有这些形式都是有机超分子共晶，多组分酸和碱之间不存在电荷转移。引导八个结构组装的非共价相互作用通过经典的 O–H⋯O、O–H⋯N、弱 C–H⋯O 和 π-π 堆积相互作用来管理，以生成 2D 或 3D 超分子结构。对于5、6、7和8，通常在羧酸和杂环碱的有机共晶中观察到的含有经典O-H⋯N和弱C-H⋯O相互作用的羧基/吡嗪超分子杂合体R22(6)和R22(8)再次被证实参与构建这些氢键超分子网络。此外，弱的C-H⋯O相互作用参与了所有有机配合物中结构的构建和巩固。通过质量损失的热重分析 (TGA) 研究了晶体 1-8 的热稳定性。
The analysis of noncovalent interactions in several complexes constructed from 2,3,5,6-tetramethylpyrazine with different acid ligands, 1,4-cyclohexanedicarboxylic acid, 2,6-dihydroxybenzoic acid, 2,6-pyridinedicarboxylic acid, 6-hydroxy-2-naphthoic acid, 3-nitrophthalic acid, o-phthalic acid and 3-hydroxybenzoic acid, supported by single crystal X-ray diffraction analysis is presented. It reveals that all of these forms except 2 are organic supramolecular cocrystals without charge-transfer between the multicomponent acids and the base. The noncovalent interactions directing the assemblies of the eight structures are managed by classical O–H⋯O, O–H⋯N, weak C–H⋯O and π–π stacking interactions to generate 2D or 3D supermolecular architectures. For 5, 6, 7 and 8, carboxyl/pyrazine supramolecular heterosynthons R22(6) and R22(8) containing classical O–H⋯N and weak C–H⋯O interactions, usually observed in organic cocrystals of carboxylic acid and heterocyclic base, are again confirmed to participate in constructing these hydrogen-bonding supermolecular networks. In addition, weak C–H⋯O interactions were involved in building and consolidating their structures in all organic complexes. The thermal stability of crystals 1–8 has been investigated by thermogravimetric analysis (TGA) of mass loss.