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首页> 外文期刊>Crystal growth & design >Polymorphism and Pseudopolymorphism of the [Ni(4-Methylpyridine)_4(NCS)_2] Werner Complex,the Compound that Led to the Concept of 'Organic Zeolites'
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Polymorphism and Pseudopolymorphism of the [Ni(4-Methylpyridine)_4(NCS)_2] Werner Complex,the Compound that Led to the Concept of 'Organic Zeolites'

机译：导致“有机沸石”概念的化合物[Ni（4-甲基吡啶）_4（NCS）_2] Werner配合物的多态性和伪多态性

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The inclusion chemistry of the title complex was revisited in the context of three topical problems of present-day crystal engineering:conventional and pseudo-polymorphism,the design of organic zeolite mimics,and the creation of "third generation"porous metal-organic frameworks.The crystal structures of dense(alpha)and microporous(beta)polymorphs of the complex were redetermined and two new crystal structures were studied:beta-and gamma-inclusion phases of the complex(1:1 and 1:2 host-to-guest ratio,respectively)with benzene as the simplest aromatic guest.Although both the beta-and gamma-crystal architectures display a remarkable adaptability toward inclusion of various guests,the mechanisms of this adaptability are essentially different.The microporous beta-phase is capable of expanding by 14.5% in response to the size of the included guest or variations in temperature.This flexibility is the highest ever observed for a metal-organic microporous framework and is responsible for the zeolitic behavior of the material.In contrast,the gamma-phase shows an ability to transform to a number of architectures that are topologically similar but crystallographically different.
机译：在常规晶体和假多态性，有机沸石模拟物的设计以及“第三代”多孔金属-有机骨架的创建等当今晶体工程的三个热点问题的背景下，重新讨论了标题配合物的包合物化学。重新确定了复合物的致密α和微孔β多晶型物的晶体结构，并研究了两个新的晶体结构：复合物的β-和γ-包涵体相（宿主与客体的1：1和1：2） β和γ晶体结构虽然对各种客体的包容都有显着的适应性，但这种适应性的机制本质上是不同的。微孔β相能够扩展响应所包含的客体的大小或温度变化而降低了14.5％。这种柔韧性是金属有机微孔骨架所观察到的最高柔韧性，并引起了相比之下，γ相显示出能够转变为拓扑相似但晶体学上不同的许多结构的能力。

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