对硫胺胺的H键受体性质的极化效应
Fergal E Hanna1, Christopher A Hunter1
1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK. herchelsmith.orgchem@ch.cam.ac.uk.
概括
这项研究量化了与结合的硫胺胺的积极合作性. 修改分子内键显著影响分子间相互作用,揭示了对H-结合网络的关键见解.
科学领域:
- 超分子化学 超分子化学
- 有机化学 有机化学
- 化学物理 化学物理
背景情况:
- 结网在分子相互作用中至关重要.
- 合作性,即一种相互作用对另一种相互作用的影响,影响H键强度.
- 硫胺组是各种化学和生物系统中重要的功能组.
研究的目的:
- 测量涉及硫胺基组的结相互作用中的合作效应的大小.
- 研究分子内键强度如何影响分子间相互作用.
- 为了确定H键受体参数和硫胺的合作性.
主要方法:
- 合成硫胺化合物,使用不同类型的胺替代剂.
- X射线晶体学和1H NMR光谱学以确认分子内H键.
- 紫外线/Vis吸收定位以确定关联常数和H键受体参数.
主要成果:
- 硫胺中的内分子H键以与--丁醇 (PFTB) 复合的形式保持.
- 电子捐赠的皮里丁替代剂加强了分子内和分子间的H键.
- 硫胺氧和胺的H键受体参数 (β) 之间观察到线性关系,产生了+0.16.16的合作性参数 (κ).
结论:
- 硫胺基团在结中表现出积极的合作性,类似于胺基.
- 分子内H键的强度直接影响分子间H键相互作用.
- 这项研究为理解和设计具有特定H-结合性质的分子提供了有价值的参数.
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