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首页> 外文期刊>Crystal growth & design >Direct Guest Exchange Induced Single-Crystal to Single-Crystal Transformation Accompanying Irreversible Crystal Expansion in Soft Porous Coordination Polymers
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Direct Guest Exchange Induced Single-Crystal to Single-Crystal Transformation Accompanying Irreversible Crystal Expansion in Soft Porous Coordination Polymers

机译:在软多孔配位聚合物中直接客体交换诱导的单晶到单晶的转变以及不可逆的晶体膨胀

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摘要

Two flexible porous coordination materials, [Mn(pybimc)(2)]center dot 2H(2)O center dot G (G = toluene, 1(tol); THF, 1(thf)), where pybimc = 2-(2'-pyridyl)-benzimidazole-5-carboxylate, featuring identical one-dimensional chain structure have been characterized. Guest exchange studies have exhibited that 1(tol) cannot be converted to 1(thf) through direct replacement of guest toluene molecules by THF molecules, but, of particular interest, 1(thf) is actually converted to 1(tol) and 1(aromatic) (where aromatic = o(-), m(-), p-xylene) upon the exchange of THF to toluene and other aromatic molecules, respectively. This signifies a single-crystal to single-crystal transformation accompanied irreversible crystal expansion. In-depth analyses reveal that the nature of the weak yet sufficiently strong framework guest C-H center dot center dot center dot pi interactions, rather than the guest size, observed in this system plays a key role in guiding the adsorption of liquid-phase aromatics in the soft crystalline materials.
机译:两种柔性多孔配位材料[Mn(pybimc)(2)]中心点2H(2)O中心点G(G =甲苯,1(tol); THF,1(thf)),其中pybimc = 2-(2表征了具有相同一维链结构的'-吡啶基)-苯并咪唑-5-羧酸酯。来宾交换研究表明,不能通过用THF分子直接取代来宾甲苯分子将1(tol)转化为1(thf),但特别令人感兴趣的是,1(thf)实际上被转化为1(tol)和1(芳烃)(其中芳烃= o(-),m(-),对二甲苯)分别将THF交换为甲苯和其他芳族分子。这表示伴随不可逆的晶体膨胀的单晶到单晶转变。深入分析表明,在该系统中观察到的弱而足够强的骨架客体CH中心点中心点中心点中心pi相互作用的性质,而不是客体大小,在引导液相芳族化合物的吸附中起着关键作用。软结晶材料。

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