关于中性和电离型金基中的原型和键长度交替以及它们在真空中的模型酶
1Department of Chemistry, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska 159c, 02-776 Warszawa, Poland.
Molecules (Basel, Switzerland)
|November 14, 2023
概括
研究了胺基中的陶托默平衡,揭示了芳香度不仅仅决定了它们的偏好. 量子化学和实验数据分析了影响这些关键核酸基结构的因素.
科学领域:
- 化学 化学 化学
- 生物化学 生物化学
- 量子化学 是一个量子化学.
背景情况:
- 胺基是核酸的基本组成部分.
- 了解它们的分体平衡对于分子生物学和药物设计至关重要.
- 之前的研究已经探讨了 tautomerism,但需要对被取代的pyrimidines进行全面的分析.
研究的目的:
- 为了获得完全的平衡性平衡,取消了胺核酸基的取代.
- 分析功能组,电子效应和分子内相互作用对分体偏好的影响.
- 将孤立的基与模型化合物进行比较,并研究电离效应.
主要方法:
- 量子化学计算以确定分体的偏好和能量.
- 使用电子移位 (HOMED) 指数的波器模型对几何参数的分析.
- 将计算结果与现有的实验数据进行比较.
主要成果:
- 在HOMED指数中,在单基和脱基胺衍生物之间观察到显著的相似之处.
- 发现几何 (HOMED) 和能量 (ΔG) 参数之间缺乏并行性.
- 芳香性被确定为不是像 uracil 和 thymine 这样的pyrimidine 基中 tautomeric 偏好的主要驱动因素.
结论:
- 胺基中的陶托马体偏好受到超出简单芳香度的复杂因素相互作用的影响.
- 霍姆德指数提供了关于电子移位和结构特征的宝贵见解.
- 需要进一步研究电离作用对原型和键长度交替的作用.
相关概念视频
Basicity of Heterocyclic Aromatic Amines
6.1K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.1K
DNA Base Pairing
27.4K
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
27.4K
Structure of Amines
2.6K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.6K
VSEPR Theory and the Effect of Lone Pairs
42.4K
Effect of Lone Pairs of Electrons on Molecule Geometry
42.4K
Basicity of Aromatic Amines
7.2K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
7.2K
Preparation of 1° Amines: Azide Synthesis
3.9K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
3.9K


