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Hydrogen Bonds00:26

Hydrogen Bonds

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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....
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Hydrogen Bonds01:04

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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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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

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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.
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Organic Compounds03:02

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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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Multifunctional porous hydrogen-bonded organic framework materials.

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Hydrogen-bonded organic frameworks (HOFs) are self-assembled porous materials. Their tunable properties make them versatile for applications in gas storage, sensing, and biomedicine.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry

Background:

  • Hydrogen-bonded organic frameworks (HOFs) are polymeric porous materials formed via self-assembly of organic linkers through hydrogen bonding.
  • Achieving permanent porosity requires robust frameworks built from rigid units and strong H-bonding interactions.
  • Framework stability can be enhanced by interpenetration and ππ interactions.

Purpose of the Study:

  • To highlight the potential of HOFs as multifunctional materials.
  • To explore HOF applications in diverse fields.

Main Methods:

  • Construction of stable and robust open HOF frameworks.
  • Utilizing rigid molecular building blocks and strong H-bonding interactions.
  • Employing framework interpenetration and ππ interactions for enhanced stability.

Main Results:

  • HOFs exhibit high crystallinity, solution processability, and self-healing properties.
  • The reversible nature of H-bonding allows for flexible framework design.
  • HOFs demonstrate potential in gas storage, separation, molecular recognition, and sensing.

Conclusions:

  • HOFs offer a versatile platform for developing multifunctional porous materials.
  • Their unique properties facilitate applications in catalysis and biomedicine.
  • HOFs show promise for advanced materials development.