基于冠烯的五重 [6]/[7] 烯:保存良好的碗核心,抑制碗倒置和与富勒烯的超分子组合
Kaixin Zhang1, Zuo-Chang Chen1, Yin-Fu Wu1
1State Key Laboratory for Physical Chemistry of Solid Surfaces, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, Xiamen University, Xiamen, 361005, China.
Angewandte Chemie (International ed. in English)
|October 31, 2024
概括
合成了新的基于冠烯的基,显示出独特的螺旋形状和不同的性稳定性. 一个烯变体表现出异常的稳定性和烯识别,使联合结晶成为可能.
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:
- 烯是具有螺旋结构的多环芳,具有独特的手术性质.
- 冠烯是一种碗形的多环芳,作为复杂分子架构的多功能构建块.
- 了解螺旋体中的结构性质关系对于设计先进的功能材料至关重要.
研究的目的:
- 合成基于新型冠烯的五重 [6] 烯和一个 [7] 烯.
- 为了研究这些新型烯衍生物的结构性行为,性稳定性和碗反转动力学.
- 探索这些基因在全烯识别和联合结晶中的潜力.
主要方法:
- 五折叠的赫克和马洛里反应用于烯合成.
- 用于结构确定的X射线晶体学.
- 密度函数理论 (DFT) 计算用于种族化障碍分析.
- 用于形状分析和富勒烯识别研究的光谱方法.
主要成果:
- 成功合成基于冠烯的五重 [6] 基 (Q[6]H-1,Q[6]H-2) 和一个 [7] 基 (Q[7]H).
- X射线结构揭示了螺旋形和准螺旋形的形状.
- Q[6]H-1在加热时转化为更稳定的Q[6]H-2;Q[7]H是形态稳定的.
- 对Q[6]H-2 (种族化障碍:45.46 kcal/mol) 观察到异常的性稳定性.
- 螺旋刀片影响了碗反转动态.
- Q[6]H-2 证明了富勒的识别和联合结晶能力.
结论:
- 微妙的形状变化显著影响多重螺旋体中的性稳定性和碗倒置.
- 基于冠烯的基因为分子识别应用提供可调节的特性.
- Q[6]H-2代表了一个有前途的平台,用于构建含富勒的超分子组合.
相关概念视频
01:18Aromatic 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...
Removing one hydrogen from the intervening CH2 group...
2.8K
02:11Conformations 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...
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
02:02Chair 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...
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.4K
01:18Aromatic Hydrocarbon Anions: Structural Overview
2.7K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
Due to the absence of continuous...
2.7K
01:28Stability of Conjugated Dienes
3.3K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.3K
02:30Stability of Substituted Cyclohexanes
12.4K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
12.4K