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Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Chemical Bonds02:40

Chemical Bonds


Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons from...
IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular hydrogen bonding...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...

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相关实验视频

Updated: Jul 15, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

在甲基醇和氧或基之间形成的同等强度的键之间的忽视差异. 实验和 DFT 的计算.

Mario C Foti1, Gino A DiLabio, K U Ingold

  • 1Istituto di Chimica Biomolecolare del CNR-Sezione di Catania, Via Del Santuario 110, 1-95028 Valverde (CT), Italy. foti@issn.ct.cnr.it

Journal of the American Chemical Society
|November 20, 2003
PubMed
概括

卡特科尔的红外光谱显示出明显的OH频段. 分子间的键转移这些带,基受体比氧基受体产生更大的转移,这表明与的结合更强,虽然更长.

科学领域:

  • 物理化学 物理化学
  • 频谱学是一种光谱学.
  • 计算化学计算化学

背景情况:

  • 甲基醇在其红外光谱中表现出两种不同的O-H伸展带,归因于自由和分子内与结合的基团.
  • 分子间的键显著影响了这些OH拉伸频率.

研究的目的:

  • 为了研究分子间结对catechol的OH拉伸频率的影响.
  • 为了比较基于氧和的键受体 (HBA) 之间的键强度和特性.
  • 根据实验光谱数据验证理论计算 (DFT).

主要方法:

  • 红外 (红外) 频谱检测CCl(4) 中的甲基醇与各种键受体.
  • 密度函数理论 (DFT) 计算以建模频率转移.
  • 与HBA强度相关的频率转移 (Deltaupsilon (((inter)) 和Deltaupsilon (((intra)) 的分析.

主要成果:

  • 分子间的键降低了自由和分子内H键的OH拉伸频率.
  • DFT计算准确地复制了观察到的实验频率变化.
  • 基于的HBA产生的频率转移大约比基于氧的同等强度的HBA大40%,这表明键特性存在差异.

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Last Updated: Jul 15, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

结论:

  • 这项研究证实,分子间的键显著改变了catechol的振动谱.
  • 与同等接受能力的氧HBA相比,HBA与甲基醇形成的固有键更强,可能是由于电荷分离和库伦比吸引力更大.
  • 理论计算为有关键相互作用的实验发现和假设提供了坚实的支持.