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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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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 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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Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it.
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Hydrogen-Bonded Duplexes with Lengthened Linkers.

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New oligoamide strands with flexible or rigid linkers form specific hydrogen-bonded duplexes. Rigid linkers induce bent conformations, enabling interstrand hydrogen bonds and creating novel association units.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Oligoamides are versatile molecules capable of forming specific hydrogen-bonding interactions.
  • Designing oligoamide strands with tailored linkers can influence their self-assembly properties.
  • Understanding the conformational behavior of oligoamides is crucial for controlling their supramolecular structures.

Purpose of the Study:

  • To synthesize and characterize novel oligoamide strands with varying linker types (flexible vs. rigid).
  • To investigate the self-assembly behavior and association specificity of these oligoamide strands in solution.
  • To explore the conformational impact of rigid aromatic linkers on the formation of hydrogen-bonded duplexes.

Main Methods:

  • Synthesis of oligoamide strands incorporating flexible and rigid linkers.
  • Spectroscopic techniques (e.g., NMR) and isothermal titration calorimetry (ITC) to study hydrogen bonding and association constants.
  • Computational modeling (e.g., DFT) to predict and analyze molecular conformations.

Main Results:

  • Oligoamide strands with flexible or rigid linkers were successfully synthesized.
  • Hydrogen-bonded homo- and heteroduplexes were formed with association constants around 10^4 M^-1 in chloroform.
  • Oligoamides with rigid aromatic linkers adopted bent conformations, facilitating interstrand hydrogen bonding.

Conclusions:

  • Tailoring linker units in oligoamides allows for the design of specific hydrogen-bonding sequences and controlled self-assembly.
  • Rigid aromatic linkers induce unique conformations that enhance interstrand hydrogen bonding in oligoamide duplexes.
  • These findings introduce a new class of association units based on conformationally adaptable oligoamides.