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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Weak intermolecular hydrogen and halogen interactions in an isomorphous halogen series of pseudoterpyridine Zn~II complexes
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Weak intermolecular hydrogen and halogen interactions in an isomorphous halogen series of pseudoterpyridine Zn~II complexes

机译:假吡啶吡啶Zn〜II配合物同构卤素系列中的弱分子间氢和卤素相互作用

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The synthesis and characterization of a series of halogen-substituted pseudoterpyridine Zn~II homoleptic mononuclear complexes, based on ligands L 11-L 44 [2,6-pyridinedicarboxaldehydebis(p-R-phenylimines), R = F, Cl, Br, I] are reported. Neither of the structures contain relatively strong classical hydrogen bonds (OH?O, NH?O, OH?N, NH?N) and the structure packing is thus determined by a subtle interplay of weaker interactions. Isostructurality of the four halogen analogues is very rare, and in this study-Br,-Cl and-F are found to be isostructural in different degrees, whereas-I is not. Interestingly, although it is closely isostructural to the-Cl and-Br compounds, the F analogue is shown not to form F?O bonds, while the Cl and the Br analogues do form Hal?O bonds. This raises an important question on the role of Hal?O bonds in the structuration of the crystal packing, particularly the stabilization effect. Similarly, while the CH?Hal interaction seems to give one-dimensional cohesion in the-Cl and-Br analogues, this feature is absent in the-F analogue, despite its close isostructurality. CH?O interactions appear to dominate to a first degree the cohesion between the anionic trifluoromethanesulfonate network and the cationic Zn-pyridinedicarboxaldehydebis(p-R-phenyl-imines) network. The analysis of these interactions is corroborated by reduced density gradient calculations based on promolecular densities.
机译:基于配体L 11-L 44 [2,6-吡啶二甲醛二(pR-苯基亚胺),R = F,Cl,Br,I]的一系列卤素取代的假吡啶吡啶Zn〜II同型单核配合物的合成和表征报告。两种结构均不包含相对强的经典氢键(OH 2 O,NH 2 O,OH 3 N,NH 3 N),因此结构堆积是由较弱相互作用的微妙相互作用决定的。四种卤素类似物的同构性非常罕见,在这项研究中,发现Br,-Cl和-F在不同程度上具有同构性,而-I并非如此。有趣的是,尽管它与-Cl和-Br化合物紧密同构,但显示出F类似物不形成F 2 O键,而Cl和Br类似物确实形成Hal 2 O键。这对Hal 2 O键在晶体堆积结构中的作用,特别是稳定作用提出了一个重要的问题。类似地,尽管CH 2 -Hal相互作用似乎在-Cl和-Br类似物中提供一维内聚性,但是尽管-F类似物具有紧密的同构性,但在-F类似物中不存在该特征。 CH 3 O的相互作用似乎在第一级上支配着阴离子三氟甲磺酸盐网络与阳离子Zn-吡啶二羧酸甲醛双(对-R-苯基亚胺)网络之间的内聚力。这些相互作用的分析通过基于前分子密度的降低的密度梯度计算得到了证实。

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