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Related Concept Videos

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.
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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

Hydrogen Bonds

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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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Bond Polarity
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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.
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Covalent Bonds01:29

Covalent Bonds

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Molecular Shape and Polarity03:37

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Dipole Moment of a Molecule
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Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures
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Triangular assembly through charged hydrogen bonds in polar solvent.

Ho Yong Lee1, Dohyun Moon, Myoung Soo Lah

  • 1Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea.

The Journal of Organic Chemistry
|November 18, 2006
PubMed
Summary
This summary is machine-generated.

Researchers created a stable triangular molecular assembly using charged hydrogen bonds and pi-pi interactions. This structure maintains stability in polar solvents and exhibits a helical arrangement confirmed by crystal and solution NMR studies.

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Area of Science:

  • Supramolecular Chemistry
  • Chemical Crystallography
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Hydrogen bonds and pi-pi interactions are crucial non-covalent forces in molecular assembly.
  • Understanding the stability and structural dynamics of self-assembled molecules in solution is essential.

Purpose of the Study:

  • To demonstrate the formation of a stable triangular molecular assembly.
  • To investigate the role of charged hydrogen bonds and pi-pi interactions in assembly stability.
  • To elucidate the solid-state and solution structures of the assembled complex.

Main Methods:

  • Self-assembly driven by charged hydrogen bonds and pi-pi interactions.
  • X-ray crystallography for solid-state structure determination.
  • Temperature-dependent proton nuclear magnetic resonance ((1)H NMR) spectroscopy for solution structure analysis.

Main Results:

  • A stable triangular assembly was successfully demonstrated.
  • The assembly exhibited remarkable stability in polar solvents due to its charged hydrogen-bond network.
  • Crystal structure confirmed a helical arrangement of the complex.
  • Solution NMR experiments assigned a D(3) isomeric structure consistent with the solid-state conformation.

Conclusions:

  • Charged hydrogen bonds and pi-pi interactions effectively drive the formation of stable supramolecular assemblies.
  • The helical structure is maintained in both solid and solution states.
  • This work provides insights into the design principles for robust self-assembled systems.