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首页> 外文期刊>Crystal growth & design >Fluoride selectivity induced transformation of charged anion complexes into unimolecular capsule of a π-acidic triamide receptor stabilized by strong N-H???F~- and C-H???F~- hydrogen bonds
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Fluoride selectivity induced transformation of charged anion complexes into unimolecular capsule of a π-acidic triamide receptor stabilized by strong N-H???F~- and C-H???F~- hydrogen bonds

机译：氟化物选择性诱导带电荷的阴离子络合物转变成由强N-H ??? F〜-和C-H ??? F〜-氢键稳定的π-酸性三酰胺受体的单分子胶囊

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摘要

The structural aspects of binding of anions such as halides (chloride, 1, and bromide, 2) and oxyanions (perchlorate, 3, and hydrogen sulfate, 4) with the protonated tris(amide) receptor L were carried out in detail. In all of these complexes, the hydrogen of protonated bridgehead nitrogen of the ligand is endo-oriented, forming a strong N-H???O hydrogen bond with an amide oxygen of a tripodal side arm, and binding of anions is primarily governed by N-H???anion and C-H???anion interactions involving multiple receptor cations. Furthermore, transformation of the charged complexes into a unimolecular capsule of L has also been accomplished in the presence of excess fluoride ion in dimethyl sulfoxide (DMSO) solution. Crystallographic analysis of fluoride complex [TBA(L?F)]2DMSO?4H _2O (5; TBA = tetrabutylammonium) shows that F~- is fully encapsulated within the tripodal cleft governed by six strong hydrogen bonds from the amide -NH and aryl -CH protons of the π-acidic receptor. ~1H NMR titration experiments further provide evidence for the formation of the F~- encapsulated receptor capsule from the charged complexes.
机译：详细进行了阴离子如卤化物（氯离子，1和溴离子2）和氧阴离子（高氯酸根，3和硫酸氢盐，4）与质子化三（酰胺）受体L结合的结构方面。在所有这些络合物中，配体的质子化桥头氮的氢是内向的，与三脚架侧臂的酰胺氧形成强的NH 2 O氢键，并且阴离子的结合主要由NH 3控制。阴离子和CH 2阴离子相互作用涉及多个受体阳离子。此外，在二甲基亚砜（DMSO）溶液中存在过量氟离子的情况下，也已完成了将带电配合物转化为L的单分子胶囊的工作。氟化物络合物[TBA（L？F）] 2DMSO？4H _2O（5; TBA =四丁基铵）的晶体学分析表明，F〜-完全被三脚架裂隙包封，由酰胺-NH和芳基-的六个强氢键控制π酸性受体的CH质子。 1 H NMR滴定实验进一步提供了由带电复合物形成F-包封的受体胶囊的证据。

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