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首页> 外文期刊>Journal of chemical crystallography >Co-crystals of 2,3-dimethylquinoxaline (DMQ) and dimethylglyoxime (DMG) in 1:1 and 1:2 ratios and hirshfeld surface analysis
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Co-crystals of 2,3-dimethylquinoxaline (DMQ) and dimethylglyoxime (DMG) in 1:1 and 1:2 ratios and hirshfeld surface analysis

机译：2,3-二甲基喹喔啉（DMQ）和二甲基乙二肟（DMG）以1：1和1：2的比例共结晶和希尔希菲尔德表面分析

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摘要

Two co-crystals of 2,3-dimethylquinoxaline (DMQ) and dimethylglyoxime (DMG) have been synthesized and characterized by single crystallographic X-ray, IR and thermal studies. Co-crystal I is colorless while co-crystal II is orange in color. In the co-crystals, both hydrogen-bonding and π·· · interactions assemble both DMQ and DMG within the crystal structure. For co-crystal I, 2D supramolecular sheet structure is formed by utilizing both hydrogen bonding and π··· interactions, while for co-crystal II supramolecular 1D chain motifs are formed by O- H···N hydrogen bonding interactions which are held together by C-H···O interactions to form 2D supramolecular network. These 2D supramolecular networks are further stacked by π·· ·π and C-H···π interactions of aromatic rings of DMQ leading to the formation of 3D supramolecular structure. Examination of the intermolecular interactions and crystal packing via Hirshfeld surface analysis reveals that most of the close contacts are associated with weak interactions. The fingerprint plots indicate that these weak interactions have significant role in crystal packing. Thermogravimetric analyses of the co-crystals have been carried out.
机译：合成了2，3-二甲基喹喔啉（DMQ）和二甲基乙二肟（DMG）的两个共晶体，并通过单晶X射线，IR和热学研究对其进行了表征。共晶体I为无色，而共晶体II为橙色。在共晶体中，氢键和π··相互作用都在晶体结构内组装了DMQ和DMG。对于共晶I，通过利用氢键和π··相互作用形成2D超分子片状结构，而对于共晶II，通过O- H···N氢键相互作用形成超分子1D链基序。通过CH··O相互作用共同形成2D超分子网络。这些2D超分子网络通过DMQ芳香环的π··π和C-H···π相互作用进一步堆叠，从而形成3D超分子结构。通过Hirshfeld表面分析对分子间相互作用和晶体堆积进行的检查表明，大多数紧密接触与弱相互作用有关。指纹图表明这些弱相互作用在晶体堆积中具有重要作用。已经对共晶体进行了热重分析。

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