Time-Dependent Solid State Polymorphism of a Series of Donor-Acceptor Dyads.
Time-Dependent Solid State Polymorphism of a Series of Donor-Acceptor Dyads.
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DOI：
10.1021/cg401522v
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发表时间：
2014-01-02
影响因子：
3.8
通讯作者：
Iverson, Brent L.
中科院分区：
文献类型：
--
作者：
Peebles, Cameron;Alvey, Paul M.;Lynch, Vincent;Iverson, Brent L.
为了利用芳香单元之间有利的静电相互作用来指导供体-受体（D-A）二元体的组装，本研究考察了具有对称侧链的共轭芳香D-A二元体在固体形成过程中随时间表现出固态多态性的能力。用单晶x射线分析和粉末x射线衍射研究了四种双晶化合物在溶剂中较慢（10-20天）或较快（1-2天）蒸发过程中的固态堆积。在溶剂蒸发较慢的情况下，两个二对体表现出尾对尾（A-A）包装，在溶剂蒸发较快的情况下，表现出头对尾（D-A）包装。采用单晶分析和XRD图谱相结合的方法建立了模型，并提出了另外两个二元的堆积模型。我们的研究结果表明，虽然不对称芳香二元体中的侧链相互作用可以在强制分离的D-A二元体组装中发挥重要作用，但缓慢蒸发的对称取代芳香二元体允许芳香部分之间有利的静电相互作用，以促进固体中成对体的组织。
In order to exploit the use of favorable electrostatic interactions between aromatic units in directing the assembly of donor-acceptor (D-A) dyads, the present work examines the ability of conjugated aromatic D-A dyads with symmetric side chains to exhibit solid-state polymorphism as a function of time during the solid formation process. Four such dyads were synthesized and their packing in the solid-state from either slower (10-20 days) or faster (1-2 days) evaporation from solvent was investigated using single crystal X-ray analysis and powder X-ray diffraction. Two of the dyads exhibited tail-to-tail (A-A) packing upon slower evaporation from solvent and head-to-tail (D-A) packing upon faster evaporation from solvent. A combination of single crystal analysis and XRD patterns were used to create models wherein a packing model for the other two dyads is proposed. Our findings suggest that while side chain interactions in asymmetric aromatic dyads can play an important role in enforcing segregated D-A dyad assembly, slowly evaporating symmetrically substituted aromatic dyads allows for favorable electrostatic interactions between the aromatic moieties to facilitate the organization of the dyads in the solid-state.
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影响因子：
4.9
作者：
Benanti, Travis L.;Saejueng, Pranorm;Venkataraman, D.
通讯作者：
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DOI：
10.1080/10601325.2011.620473
发表时间：
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作者：
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