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Cooperative effects between pi-hole triel and pi-hole chalcogen bonds

机译:Pi-孔三尔和Pi-孔硫代菌键之间的合作效应

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摘要

MP2/aug-cc-pVTZ calculations have been performed on pi-hole triel- and chalcogen-bonded complexes involving a heteroaromatic compound. These complexes are very stable with large interaction energy up to -47 kcal mol(-1). The sp(2)-hybridized nitrogen atom engages in a stronger pi-hole bond than the sphybridized species although the former has smaller negative electrostatic potential. The sp(2)-hybridized oxygen atom in 1,4-benzoquinone is a weaker electron donor in the pi-hole bond than the sp(2)-hybridized nitrogen atom. The pi-hole triel bond is stronger than the pi-hole chalcogen bond. A clear structural deformation is found for the triel or chalcogen donor molecule in these pi-hole-bonded complexes. The triel bond exhibits partially covalent interaction, whereas the chalcogen bond exhibits covalent interaction in the SO3 complexes of pyrazine and pyridine derivatives with a sp(2)-hybridized nitrogen atom. Intermolecular charge transfer ( 0.2e) occurs to a considerable extent in these complexes. In ternary complexes involving an aromatic compound, wherein a triel bond and a chalcogen bond coexist, both the interactions are weakened or strengthened when the central aromatic molecule acts as a double Lewis base or plays a dual role of both a base and an acid. Both electrostatic and charge transfer effects have important contributions toward changes in the strength of both interactions.
机译:已经对涉及杂芳族化合物的Pi-Ha洞三螺酰胺和硫代糖 - 键合复合物进行MP2 / AUG-CC-PVTZ计算。这些配合物非常稳定,具有高达-47kcal摩尔(-1)的大相互作用能量。虽然前者具有较小的负静电电位,SP(2) - 杂交氮原子与纺丝物质更强的Pi-Hob键合。在1,4-苯并醌中的SP(2) - 杂交氧原子是PI-HOLE键的较弱的电子供体,而不是SP(2)酵母化氮原子。 Pi-孔三烯键比Pi孔硫粘接剂强。在这些PI-空穴 - 粘合的配合物中发现三烯或硫族化体供体分子的透明结构变形。三焊表现出部分共价相互作用,而硫致裂解键在吡嗪和吡啶衍生物的SO 3络合物中表现出共价相互作用,具有SP(2) - 次次化的氮原子。分子间电荷转移(& 0.2e)在这些配合物中发生相当大的程度。在涉及芳族化合物的三元复合物中,当中央芳族分子用作双路易斯碱或者碱和酸的双重作用时,三元键和胆粘合共存时,两者相互作用被削弱或加强。静电和电荷转移效应均对两种相互作用强度的变化具有重要贡献。

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  • 来源
    《RSC Advances》 |2018年第47期|共9页
  • 作者单位

    Yantai Univ Lab Theoret &

    Computat Chem Sch Chem &

    Chem Engn Yantai 264005 Peoples R China;

    Yantai Univ Lab Theoret &

    Computat Chem Sch Chem &

    Chem Engn Yantai 264005 Peoples R China;

    Yantai Univ Lab Theoret &

    Computat Chem Sch Chem &

    Chem Engn Yantai 264005 Peoples R China;

    Yantai Univ Lab Theoret &

    Computat Chem Sch Chem &

    Chem Engn Yantai 264005 Peoples R China;

    Yantai Univ Lab Theoret &

    Computat Chem Sch Chem &

    Chem Engn Yantai 264005 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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