Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.8K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.2K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.2K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.4K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.4K
Tail-anchoring of Proteins in the ER Membrane01:45

Tail-anchoring of Proteins in the ER Membrane

3.1K
Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
3.1K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

1.7K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.0K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Conjugated Polymer Semiconductors Enabled Multifunctional Interfacial Engineering for High-Performance Inverted Perovskite Solar Cells.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Suppressing Charge Carrier Recombination in Bulk Heterojunction Organic Photocatalyst via Improving Molecular Crystallinity and Reducing Electron-Phonon Coupling for Efficient Hydrogen Evolution Reaction.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Tachyarrhythmia is a prognostic factor for severity and mortality in patients with Severe Fever with Thrombocytopenia Syndrome.

International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases·2026
Same author

Purely organic room-temperature phosphorescence sensitizers for OLEDs.

Chemical science·2026
Same author

Coplanar indoline-functionalized fullerene with elevated LUMO level for tin halide perovskite photovoltaics.

Chemical communications (Cambridge, England)·2026
Same author

Integrated microfluidic biosensors: shaping the future of quantitative life sciences and on-chip molecular diagnostics.

Lab on a chip·2026
Same journal

Recent progress in catalytic asymmetric synthesis of triarylmethanes.

Chemical science·2026
Same journal

GFP chromophore photophysics: ultrafast dynamics and hot ground state cooling in the neutral form.

Chemical science·2026
Same journal

Large Stokes shift fluorophores from <i>meta</i>-substituted zwitterions.

Chemical science·2026
Same journal

<i>In situ</i> glycosylation-directed H-aggregation of Type I photosensitizers for synergistic biofilm eradication and promoting diabetic wound healing.

Chemical science·2026
Same journal

Substituent engineering of dynamic covalent bonds enables simultaneous enhancement of performance and recyclability.

Chemical science·2026
Same journal

Visible-light-enabled three-component carboamidation of alkenes with aryl thianthrenium salts.

Chemical science·2026
查看所有相关文章

相关实验视频

Updated: Jun 11, 2025

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
11:09

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Published on: August 1, 2018

10.7K

绕着绳索纠的结合螺旋.

Ke Jin1,2, Zuo Xiao1,2, Huidong Xie1,2

  • 1Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology Beijing 100190 China xiaoz@nanoctr.cn ding@nanoctr.cn.

Chemical science
|October 2, 2024
PubMed
概括
此摘要是机器生成的。

绳索纠联螺旋 (TECHs) 提供了一种创新的方法,用于创建稳定的螺旋状多芳香分子. 这种设计允许可调整的性和持久性属性,从而产生强的循环极化发光.

更多相关视频

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
06:17

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay

Published on: February 28, 2025

470
Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

23.2K

相关实验视频

Last Updated: Jun 11, 2025

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
11:09

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Published on: August 1, 2018

10.7K
Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
06:17

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay

Published on: February 28, 2025

470
Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

23.2K

科学领域:

  • 有机化学 有机化学
  • 超分子化学 超分子化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 螺旋式多芳香分子因其独特的电子和光学特性而引起人们的兴趣.
  • 实现稳定和可调节的螺旋结构与受控的性仍然是一个挑战.

研究的目的:

  • 引入一种新的设计概念,即绕合螺旋 (TECHs),用于创建螺旋式多芳香分子.
  • 为了证明TECHs的可定制合成和持久的奇拉性质.
  • 研究TECHs的光物理特性,包括循环极化发光 (CPL) 的研究.

主要方法:

  • 模块化合成使用平面合式连接单元 (C2对称) 和对接单元 (C2h对称).
  • 合成的洞型和凸型TECHs的表征.
  • 单晶X射线衍射分析.
  • 关于π-二元形成和结合能量的理论研究.
  • 光物理测量,包括度依赖的辐射和CPL光谱.

主要成果:

  • 成功合成具有确定的螺旋性和持久性属性的TECHs,没有后性解像度.
  • 在型TECH中观察非传统的双螺旋 π-模体,其结合能比平面 π-模体低.
  • 形型TECH中的度依赖性排放的展示,归因于激发状态双螺旋 π-二次体的形成.
  • 所有的TECH都表现出强大的CPL,其g_lum 值通常超过10−3.
  • (P) -T4-tBu导数获得了1.0 × 10−2的高g_luminescence和316 M−1 cm−1.1的CPL亮度.

结论:

  • 科技为设计具有可调整3D螺旋结构和固有的性分子提供了一个多功能平台.
  • 带的共价锁定确保了持续的奇拉性质.
  • 科技产品表现出有前途的CPL特性,使他们成为先进光学应用的潜在候选人.