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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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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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The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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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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Hydrogen-bonded perylene bisimide J-aggregate aqua material.

Vincenzo Grande1,2, Bartolome Soberats2, Stefanie Herbst1

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Researchers developed a novel perylene bisimide (PBI) that forms stable J-aggregates in water. These PBI materials exhibit temperature-dependent color changes and fluorescence, enabling new biocompatible functional materials.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Perylene bisimides (PBIs) are known for their photophysical properties.
  • Developing stable PBI aggregates in aqueous environments is challenging.
  • Self-assembly of amphiphiles is key to creating functional nanomaterials.

Purpose of the Study:

  • To synthesize a novel methoxy-triethyleneglycol-jacketed tetraphenoxy-perylene bisimide (MEG-PBI) amphiphile.
  • To investigate the self-assembly behavior and properties of MEG-PBI in water.
  • To explore the potential of MEG-PBI for developing novel functional materials.

Main Methods:

  • Synthesis of the MEG-PBI amphiphile.
  • Characterization of supramolecular aggregates using spectroscopic techniques.
  • Fabrication and testing of hydrogels and liquid crystalline states.
  • Thermal analysis to study temperature-induced changes.

Main Results:

  • MEG-PBI self-assembles into red (low order) and blue (highly ordered J-aggregates) supramolecular structures in water.
  • The PBI is miscible with water, allowing robust aggregate formation in solution, hydrogels, and liquid crystals.
  • Hydrogels exhibit a reversible color change from red to blue with fluorescence light-up upon heating (30-50 °C).
  • The color change is driven by temperature-induced hydrogen-bond-directed slipped stacking within J-aggregates.

Conclusions:

  • This study presents the first stable PBI J-aggregate in water.
  • The developed MEG-PBI amphiphile offers a versatile platform for biocompatible functional materials.
  • The findings open new avenues for hydrogen-bonded supramolecular materials in aqueous systems.