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相关概念视频

Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

Dipole Moment of a Molecule
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
Fischer Projections02:18

Fischer Projections

Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.

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相关实验视频

Updated: Jun 21, 2026

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
07:55

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays

Published on: November 9, 2012

在柔性分子中确定绝对配置:一个案例研究.

K M Specht1, J Nam, D M Ho

  • 1Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.

Journal of the American Chemical Society
|September 13, 2001
PubMed
概括
此摘要是机器生成的。

赋予分子绝对配置是很困难的,特别是对于灵活的分子. 结合分子建模,NMR和X射线晶体学突出了这些挑战,光旋分散 (ORD) 证明是分配最有效的方法.

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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination

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Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
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相关实验视频

Last Updated: Jun 21, 2026

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
07:55

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays

Published on: November 9, 2012

High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
11:24

High Precision FRET at Single-molecule Level for Biomolecule Structure Determination

Published on: May 13, 2017

Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
10:23

Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules

Published on: April 25, 2025

科学领域:

  • 有机化学 有机化学
  • 立体化学是一种立体化学.
  • 计算化学的计算化学

背景情况:

  • 赋予分子的绝对配置是化学中持续存在的挑战.
  • 形状灵活的系统在立体化学确定方面存在特殊困难,即使对于经验丰富的研究人员来说也是如此.

研究的目的:

  • 为了说明仅使用基于解决方案的方法来分配绝对配置的困难.
  • 介绍一个用多种技术来确定分子配置的案例研究.
  • 在复杂系统中确定绝对配置赋值的最有效方法.

主要方法:

  • 使用了分子建模和实验技术的组合.
  • 使用的解决方案 核磁共振 (NMR) 光谱学.
  • 集成的X射线晶体学用于结构分析.
  • 计算和实验测量的光学旋转分散 (ORD) 数据.

主要成果:

  • 证明了仅依赖于解决方案状态方法来配置分配的局限性.
  • 射线晶体学提供了明确的结构信息.
  • 计算和实验ORD数据的比较提供了分配绝对配置的最直接的途径.

结论:

  • 在柔性分子中确定绝对配置需要采用多技术方法.
  • 溶液核磁共振和X射线晶体学虽然有价值,但对这项特定任务有局限性.
  • 光学旋转分散 (ORD) 分析,当与计算方法相结合时,为分配绝对配置提供了一个强大的解决方案.