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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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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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Covalent Bonding and Lewis Structures02:46

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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Polar Covalent Bonds02:24

Polar Covalent Bonds

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Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Nonmetal atoms frequently form covalent bonds with other nonmetal atoms. For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. When two separate hydrogen atoms with a particular potential energy approach each other, their valence orbitals...
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sp3d and sp3d 2 Hybridization
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Hydrogen Bonding: HOC=O· · ·H-N vs. HOC=O· · ·H-C.

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|March 7, 2015
PubMed
Summary

A novel dipyrrinone molecule was synthesized, featuring carboxylic acid groups capable of forming intramolecular hydrogen bonds. NMR analysis revealed two conformations, with the syn-(Z) form being more stable.

Keywords:
ConformationNMRPyrroles

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Dipyrrinone derivatives are known for their unique chemical properties.
  • Intramolecular hydrogen bonding plays a crucial role in molecular conformation and stability.

Purpose of the Study:

  • To synthesize a novel dipyrrinone with specific functional groups for studying intramolecular hydrogen bonding.
  • To investigate the conformational preferences and dynamics of the synthesized molecule.

Main Methods:

  • Synthesis of 8,9-bis-(5-carboxypentyl)-2,3-bis-(2-methoxyethoxy)-10H-dipyrrin-1-one.
  • 1H Nuclear Magnetic Resonance (NMR) spectroscopy to analyze molecular conformations and equilibrium.

Main Results:

  • The synthesized dipyrrinone exhibits chloroform solubility due to its substituents.
  • Evidence for two monomer conformations, syn-(Z) and anti-(Z), in equilibrium was observed via 1H NMR.
  • The syn-(Z) conformation was found to be favored over the anti-(Z) conformation.
  • An interconversion barrier of approximately 40 kJ mol-1 between the conformations was predicted.

Conclusions:

  • The synthesized dipyrrinone can form intramolecular hydrogen bonds involving carboxylic acid groups, lactam, and pyrrole N-H or C(7)-H depending on conformation.
  • The study provides insights into the conformational behavior and stability of functionalized dipyrrinones.