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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Selective recognition of fluoride salts by vasarenes: a key role of a self-assembled in situ dimeric entity via an exceptionally short [O-H-O](-) H-bond
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Selective recognition of fluoride salts by vasarenes: a key role of a self-assembled in situ dimeric entity via an exceptionally short [O-H-O](-) H-bond

机译：vasarenes对氟化物盐的选择性识别：通过异常短的[O-H-O]（-）H键自组装的原位二聚体的关键作用

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摘要

A self-assembled supramolecular dimeric entity via an exceptionally short (2.404 angstrom) and strong (22.9 kcal mol(-1)) [O-H-O](-) hydrogen bond is the key to the special reactivity of vasarenes with fluoride salts. Vasarene is a self-assembled, vase-shaped compound, obtained by the reaction between ninhydrin and phloroglucinol. Analogous compounds are prepared by replacing the phloroglucinol with other polyhydroxy aromatics. Vasarenes show special affinity towards compounds of the type M+ F-, where M being a large monovalent cation, producing ion-pair-vasarene adducts. The first step in the proposed mechanism is the dissociation of the M+ F- salt releasing F-to the solution, which may provide an explanation as to why only MF salts, which include large monovalent cations, undergo this reaction. From a practical point of view, the ease of their preparation and their special affinity towards fluoride salts make vasarenes potential means for salt separation. The readily formed dimeric structure with the very short [O-H-O](-) negative charge-assisted H-bond (-CAHB) can also be further used as a model in theoretical studies of such systems and understanding their role in biological processes.
机译：通过异常短（2.404埃）和强（22.9 kcal mol（-1））[O-H-O]（-）氢键的自组装超分子二聚体是vasarenes与氟化物盐特殊反应性的关键。瓦沙烯是一种自组装的花瓶状化合物，是通过茚三酮和间苯三酚之间的反应获得的。通过用其他多羟基芳族化合物代替间苯三酚制备类似的化合物。缬沙烯对M + F-型化合物具有特殊的亲和力，其中M为大的单价阳离子，会生成离子对-芳烃加合物。所提出机理的第一步是将释放F +的M + F-盐解离到溶液中，这可以解释为什么只有包含大单价阳离子的MF盐会发生此反应。从实用的角度来看，其制备的简便性和对氟化物盐的特殊亲和力使vasarenes成为分离盐的潜在手段。具有非常短的[O-H-O]（-）负电荷辅助H键（-CAHB）的易于形成的二聚结构也可以进一步用作此类系统的理论研究模型，并了解它们在生物过程中的作用。

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