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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

16.3K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
16.3K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

995
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
995
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.1K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.1K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.2K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.2K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

2.4K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
2.4K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.3K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
3.3K

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Pyridine-CF4: a molecule with a rotating cap.

Assimo Maris1, Laura B Favero, Biagio Velino

  • 1Dipartimento di Chimica "G. Ciamician", Università di Bologna , Via Selmi 2, I-40126 Bologna, Italy.

The Journal of Physical Chemistry. A
|October 22, 2013
PubMed
Summary

Researchers studied the pyridine-CF4 complex using microwave spectroscopy. They found the carbon tetrafluoride (CF4) molecule caps the pyridine nitrogen, with free rotation between them, and a dissociation energy of approximately 10 kJ/mol.

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Area of Science:

  • Chemical Physics
  • Molecular Spectroscopy
  • Supramolecular Chemistry

Background:

  • Understanding non-covalent interactions is crucial in chemistry.
  • Pyridine and carbon tetrafluoride are important molecules in various chemical applications.
  • Investigating complexes provides insights into intermolecular forces.

Purpose of the Study:

  • To characterize the structure and dynamics of the pyridine-CF4 complex.
  • To determine the binding energy and intermolecular distance within the complex.
  • To explore the rotational behavior of the complex in a supersonic expansion.

Main Methods:

  • Molecular beam Fourier transform microwave spectroscopy was employed.
  • Supersonic expansion was used to generate and cool the complex.
  • Analysis of rotational spectra provided structural and energetic information.

Main Results:

  • The carbon tetrafluoride (CF4) moiety was observed to cap the pyridine nitrogen atom.
  • The pyridine and CF4 units exhibit free internal rotation.
  • The N···CCF4 intermolecular distance was determined to be 3.372(1) Å.
  • The estimated dissociation energy of the complex is approximately 10 kJ/mol.

Conclusions:

  • The pyridine-CF4 complex forms a weakly bound adduct with a specific orientation.
  • The rotational dynamics are indicative of a relatively free internal motion.
  • The determined structural and energetic parameters contribute to the understanding of halogen bonding and non-covalent interactions.