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Pseudopolymorphism of a highly adaptable tetraarylpyrene host that exhibits abundant solid-state guest inclusion

机译：高适应性的四芳基py主体的伪多态性，表现出丰富的固态客体包含

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摘要

Tetraarylpyrene host 1,3,6,8-tetrakis(2,6-dimethyl-4-methoxyphenyl)pyrene (TP) is found to crystallize with inclusion of diverse guests in two different modifications with simple variation of the crystallization conditions involving addition of a cosolvent. While the guest stoichiometry is found to vary in the pseudopolymorphs with some guests, polymorphic behavior of the host-guest compounds is observed with cyclohexenone and toluene as guests. The crystal structures of the polymorphic inclusion compounds constitute rather rare examples of supramolecular isomerism. The thermogravimetric analyses of the inclusion compounds show that the guest in one of the modifications is released in a relatively higher temperature range. The structural diversity exhibited by the host TP with various guest molecules and its ability to exhibit different forms with the same guest has been to attributed its unique structural features that inherently confer the system with guest inclusion behavior, conformational freedom associated with the methoxy groups and the near-orthogonal p-anisyl rings, and its potential to exploit weak C-H???O and C-H???π hydrogen bonds in response to the guest.
机译：发现四芳基py主体1,3,6,8-四（2,6-二甲基-4-甲氧基苯基）py（TP）结晶，在两个不同的修饰中包含不同的客体，其中结晶条件的简单变化涉及添加助溶剂。虽然发现客体化学计量随某些客体而变化为假多晶型，但以环己烯酮和甲苯为客体观察到了客体-客体化合物的多态行为。多晶型包合物的晶体结构构成超分子异构现象的相当罕见的例子。夹杂物的热重分析表明，变体之一的客体在相对较高的温度范围内释放。宿主TP具有各种客体分子表现出的结构多样性及其与同一客体表现出不同形式的能力归因于其独特的结构特征，固有地赋予系统客体包含行为，与甲氧基基团相关的构象自由以及接近正交的对茴香基环，并具有响应客体而利用弱CH OH和CHπ氢键的潜力。

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