1,2,4,6-Thiatriazinyl Radicals and Dimers: Structural and Electronic Tuning through Heteroaromatic Substituent Modification
作者:Nathan J. Yutronkie、Alicea A. Leitch、Ilia Korobkov、Jaclyn L. Brusso
DOI:10.1021/acs.cgd.5b00296
日期:2015.5.6
The functionalization of thiatriazinyl (TTA) radicals with pyridyl and thienyl moieties is described, and their influence at both the molecular and solid-state level has been investigated. Comparative electron paramagnetic resonance studies of 3,5-bis-(2-pyridyl)-1,2,4,6-thiatriazinyl (Py2TTA) and 3,5-bis-(2-thienyl)-1,2,4,6-thiatriazinyl (Th2TTA) reveal the impact of heteroaromatic substitution on the electronic structure, which is supported by density functional theory calculations. Single crystal X-ray analysis emphasizes the importance of intermolecular contacts on the crystal packing and demonstrates the potential for structural control through S---N′ and N---HC′ interactions, which are enhanced in Py2TTA and Th2TTA by the presence of the pyridyl and thienyl groups, respectively. This work represents a fundamental study of heterocyclic aromatic substitution in thiazyl-based radicals and investigates how varying these functional groups influences the molecular properties and long-range order within the supramolecular structure.
描述了噻二氮基(TTA)自由基与吡啶基和噻吩基部分的功能化,并研究了它们在分子和固态水平上的影响。对3,5-bis-(2-吡啶基)-1,2,4,6-噻二氮基(Py2TTA)和3,5-bis-(2-噻吩基)-1,2,4,6-噻二氮基(Th2TTA)的比较电子自旋共振研究揭示了杂芳烃取代对电子结构的影响,这一观点得到了密度泛函理论计算的支持。单晶X射线分析强调了分子间接触在晶体堆积中的重要性,并展示了通过S---N′和N---HC′相互作用进行结构控制的潜力,这些相互作用在Py2TTA和Th2TTA中由于吡啶基和噻吩基的存在而得到增强。这项工作代表了对基于噻唑的自由基中杂环芳烃取代的基础研究,并探讨了变化这些功能团如何影响分子特性和超分子结构中的长程有序性。