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相关概念视频

Hybridization of Atomic Orbitals II03:35

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sp3d and sp3d 2 Hybridization
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
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相关实验视频

Updated: May 29, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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在二次氨酸中的多态性.

Mo Liu1, Keith Izod1, Paul G Waddell1

  • 1School of Natural and Environmental Sciences, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom.

Acta crystallographica. Section C, Structural chemistry
|February 5, 2025
PubMed
概括
此摘要是机器生成的。

多态性,即多个晶体结构的存在,首次在二次素 (R2PH) 中被发现. 这项研究揭示了晶体包装如何影响 bis{2,3,5,6-tetramethylphenyl) phosphine 中的分子构成和硬质障碍.

关键词:
我...π 相互作用晶体包装 晶体包装晶体结构 晶体结构多形态主义的多态主义.二次性氨酸是一种氨酸.固体压力压力是什么

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科学领域:

  • 晶体学 晶体学是指结晶学.
  • 固态化学 固态化学
  • 有机化学 有机化学

背景情况:

  • 多态性在有机化合物中很常见,但在二次素中很少记录.
  • 了解晶体包装对于预测和控制固态特性至关重要.

研究的目的:

  • 报告第一个在二次素中多态的实例.
  • 调查晶体包装对分子构成和硬质障碍的影响.
  • 描述观察到的多态生物的超分子结构.

主要方法:

  • 单晶X射线衍射被用来确定两个多态的晶体结构.
  • 分子构造,包装安排和分子间相互作用的分析.

主要成果:

  • 鉴定出了二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二
  • 多态体表现出不同的分子构造和超分子排列 (列与层).
  • 在多态II中观察到弱Me...π相互作用,与C-P-C键角度的变化相关.

结论:

  • 这项研究确立了二次氨酸中的多态性.
  • 晶体包装显著影响原子周围的固态环境.
  • 超分子相互作用虽然很弱,但在结构变化中起作用.