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Related Concept Videos

Hydrogen Bonds00:26

Hydrogen Bonds

132.0K
Hydrogen 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 unequally shared....
132.0K
Hydrogen Bonds01:04

Hydrogen Bonds

13.6K
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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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

1.8K
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...
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Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Covalent Bonds01:29

Covalent Bonds

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Overview
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Two solvent-induced variable host-guest two-dimensional binary frameworks mediated by hydrogen bonding.

Wei Li1, Shenyu Qiu, Chengyong Xu

  • 1Department of Science, Nanchang Institute of Technology, Nanchang 330099, P. R. China. liweidting@nit.edu.cn.

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Researchers explored 2D hydrogen-bonded organic frameworks using scanning tunneling microscopy (STM). Solvent choice significantly impacts network assembly, with longer chains promoting porous structures.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Surface Science

Background:

  • Hydrogen-bonded organic frameworks (HOFs) are crystalline materials formed through non-covalent interactions.
  • Two-dimensional (2D) HOFs offer unique properties for surface science and nanotechnology.
  • Controlling the self-assembly of HOFs at interfaces is crucial for designing functional materials.

Purpose of the Study:

  • To investigate the formation and structure of 2D binary HOFs composed of 1,3,5-benzenetricarboxylic acid (TMA) and 4,4'-biphenyldicarboxylic acid (BDA).
  • To understand the influence of different alkane solvents (heptanoic acid and octanoic acid) on the self-assembly of these binary HOFs on highly oriented pyrolytic graphite (HOPG).
  • To elucidate the relationship between solvent properties, specifically chain length, and the resulting network architectures.

Main Methods:

  • Utilizing high-resolution scanning tunneling microscopy (STM) to visualize the self-assembled structures at the liquid-solid interface.
  • Conducting experiments in two different solvent environments: heptanoic acid and octanoic acid.
  • Analyzing the morphology and ordering of the hydrogen-bonded networks formed by TMA and BDA on the HOPG substrate.

Main Results:

  • STM revealed distinct self-assembly behaviors dependent on the solvent used.
  • In heptanoic acid, well-ordered, porous, rectangular, flowerlike networks of TMA/BDA were observed.
  • In octanoic acid, two different coexisting densely packed guest-host BDA/TMA structures were formed, indicating a different assembly pathway.

Conclusions:

  • The solvent plays a critical role in directing the self-assembly of 2D binary HOFs.
  • Solvent chain length is a key factor influencing the resulting network topology, with longer chains favoring porous polymorphic networks.
  • This study provides insights into the rational design of interfacial HOF structures by controlling solvent environments.