Enclathration of Saturated Five-Membered Rings by Tricyclic Fused Host Systems

IF 3.2 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Brandon Barnardo*, Benita Barton, Mino R. Caira* and Eric C. Hosten, 
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引用次数: 0

Abstract

In this work, the tricyclic fused host systems N,N′-bis(9-phenyl-9H-xanthen-9-yl)butane-1,4-diamine (H1) and N,N′-bis(9-(naphthalen-1-yl)-9H-xanthen-9-yl)butane-1,4-diamine (H2) were investigated for their host potential for three saturated five-membered ring guest solvents, namely, tetrahydrofuran, tetrahydrothiophene, and pyrrolidine (THF, THT, and PYRR). Both host species successfully enclathrated these solvents, forming 1:2 host–guest complexes with each one. Guest competition experiments by means of the crystallization of H1 from all combinations of equimolar guest mixtures demonstrated a host selectivity that increased in the order THT < PYRR < THF. However, analogous experiments with H2 only revealed a consistent preference for THT, while the selectivity for THF and PYRR depended on the number and types of guest species present. Nonequimolar binary guest experiments were also carried out, and these largely concurred with observations made in the equimolar guest experiments. SCXRD analyses demonstrated that H1 retained its preferred guest compound, THF, in the crystal of the complex by means of a classical hydrogen bond (H···O, N···O, 2.31(3) Å, 3.193(4) Å, and 162(3)°), while THT (least favored) was involved in weaker (host)C–H···S–C(guest) and (host)N–H···S(guest) interactions (H···S, C···S, 2.91, 3.836 Å, 164°; H···S, N···S, 3.112, 4.027 Å, 168.92°, and 3.045, 3.971 Å, 174.65° for the two disorder guest components). H2, on the other hand, retained its preferred guest species (THT) in the complex by means of a singular short (guest)C–H···C–C(host) contact (C···H, C···C, 2.83, 3.754 Å, and 156°) which was absent in the inclusion compound containing disfavored THF. Moreover, also in this complex was identified a (host)N–H···S(guest) hydrogen bond (THF did not experience a hydrogen bond with H2); measurements were 3.468, 4.134 Å, and 135.38°. These observations align exactly with the guest preferences of these two host compounds. Hirshfeld surface considerations were employed to further explain these host behaviors in guest mixtures. Finally, thermal analyses were undertaken in order to determine the relative thermal stabilities of these complexes.

A (host)N−H···S(guest) hydrogen bond between host compound N,N′-bis(9-(napthalen-1-yl)-9H-xanthen-9-yl)butane-1,4-diamine (H2) and guest species tetrahydrothiophene (THT) facilitates the preference of H2 for THT in tetrahydrofuran/THT/pyrrolidine mixtures.

饱和五元环的三环融合主体体系包合
在这项工作中,研究了三环融合宿主系统N,N ' -二(9-苯基- 9h -黄原-9-基)丁烷-1,4-二胺(H1)和N,N ' -二(9-(萘-1-基)- 9h -黄原-9-基)丁烷-1,4-二胺(H2)对三种饱和五元环客体溶剂,即四氢呋喃,四氢噻吩和吡咯烷(THF, THT和PYRR)的寄主潜力。两种宿主都成功地包封了这些溶剂,并与每种溶剂形成1:2的主-客体复合物。通过从所有等摩尔客体混合物组合中结晶H1的客体竞争实验表明,宿主选择性按THT和lt的顺序增加;PYRR & lt;四氢呋喃。然而,类似的H2实验只显示了对THT的一致偏好,而对THF和PYRR的选择性取决于存在的客体物种的数量和类型。还进行了非等摩尔双客体实验,这些实验结果与等摩尔客体实验的观察结果基本一致。SCXRD分析表明,H1通过经典氢键(H··O, N··O, 2.31(3) Å, 3.193(4) Å和162(3)°)在配合物晶体中保留了其首选客体化合物THF,而THT(最不受青睐)参与了较弱的(宿主)C - H··S - C(客体)和(宿主)N - H··S(客体)相互作用(H··S, C··S, 2.91, 3.836 Å, 164°);H··S, N··S, 3.112, 4.027 Å, 168.92°,以及3.045,3.971 Å, 174.65°(两个无序客体分量)。另一方面,H2通过单一的短(客)C - H···C - C(宿主)接触(C··H, C··C, 2.83, 3.754 Å和156°)保留了配合物中的首选客体(THT),而这在含不利THF的包合物中是不存在的。此外,在该配合物中还发现了一个(主)N-H···S(客)氢键(THF未与H2发生氢键);测量值为3.468°、4.134°Å和135.38°。这些观察结果与这两种寄主化合物的客体偏好完全一致。赫什菲尔德表面的考虑被用来进一步解释这些主客混合物的行为。最后,进行热分析,以确定这些配合物的相对热稳定性。在四氢呋喃/四氢呋喃/吡咯烷混合物中,宿主化合物N,N ' -二(9-(萘二烯-1-基)- 9h -杂原-9-基)丁烷-1,4-二胺(H2)和客体物质四氢噻吩(THT)之间存在一个N−H···S(客体)氢键,促进了H2对THT的偏好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Crystal Growth & Design
Crystal Growth & Design 化学-材料科学:综合
CiteScore
6.30
自引率
10.50%
发文量
650
审稿时长
1.9 months
期刊介绍: The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials. Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.
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