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首页> 外文期刊>Crystal growth & design >Time-Dependent Solid-State Polymorphism of a Series of Donor? Acceptor Dyads
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Time-Dependent Solid-State Polymorphism of a Series of Donor? Acceptor Dyads

机译：一系列供体的时间依赖性固态多态性？受体染料

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摘要

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.
机译：为了利用芳族单元之间有利的静电相互作用来指导供体-受体（D？A）二元组的组装，本工作研究了具有对称侧链的共轭芳族D？A二元组显示固态的能力。固相形成过程中，多态性随时间变化。合成了四个这样的二元组，并使用单晶X射线分析和粉末X射线衍射研究了从溶剂中较慢（10-20天）或较快（1-2天）蒸发后的固态堆积。当从溶剂中蒸发较慢时，两个二联体显示出尾对尾（A→A）堆积，而从溶剂中蒸发较快则显示出头对尾（D→A）堆积。使用单晶分析和XRD图案的组合来创建模型，其中提出了用于其他两个二元组的堆积模型。我们的发现表明，虽然不对称芳香族双链中的侧链相互作用可在强制分离D？A二聚体中发挥重要作用，但缓慢蒸发对称取代的芳香族二聚体可以使芳香族部分之间产生有利的静电相互作用，从而促进二聚体在组织中的组织。固体状态。

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