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首页> 外文期刊>Crystal growth & design >Competition between methoxy-based and pyrazine-based synthons in methoxy-substituted distyrylpyrazines
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Competition between methoxy-based and pyrazine-based synthons in methoxy-substituted distyrylpyrazines

机译：甲氧基取代的二苯乙烯基吡嗪类中甲氧基和吡嗪基合成子之间的竞争

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摘要

Four new methoxy-substituted derivatives of E,E-2,5-bis(2-phenylethenyl) pyrazine have been synthesized. The supramolecular structures of the resulting set of five polymorphs have been studied using single-crystal X-ray diffraction to gauge the influence of the position of the methoxy groups on the organization of the molecules in the solid state, as part of an attempt to dispense with the particular polymorphism of the parent compound. The crystal packing patterns were analyzed in terms of the two pyrazine-based synthons found in the parent compoundss crystal structure, the π_(pyrazine)?π _(phenyl) stacking synthon, and the pyrazine hydrogen-bonded synthon, as well as in terms of weak intermolecular interactions such as CH?O, CH?N, and CH?π. The analysis shows that the introduction of methoxy groups in positions other than only the para position of the peripheral benzene rings successfully switches off the two synthons seen in the parent compound and that the new compounds adopt other packing strategies, based on methoxy?methoxy and -OCH3?π contacts. Polymorphism, however, remains.
机译：合成了E，E-2,5-双（2-苯基乙烯基）吡嗪的四种新的甲氧基取代的衍生物。作为尝试进行分配的一部分，已经使用单晶X射线衍射研究了所得的五种多晶型物的超分子结构，以测定甲氧基的位置对固态分子的组织的影响。具有母体化合物的特定多态性。根据在母体化合物晶体结构中发现的两种吡嗪基合成子，π_（吡嗪）→π_（苯基）堆积合成子和吡嗪氢键合成子，分析了晶体堆积模式。弱分子间相互作用（如CH 2 O，CH 2 N和CH 2π）的作用。分析表明，仅在外围苯环对位以外的位置引入甲氧基可成功地关闭母体化合物中的两个合成子，并且新化合物采用其他基于甲氧基，甲氧基和-的填充策略OCH3？π触点。但是，多态性仍然存在。

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