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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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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...
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Stereoisomerism of Cyclic Compounds02:33

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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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...
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Newman Projections02:06

Newman Projections

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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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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...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.1K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Synthetic Dimension-Induced Conical Intersections in Rydberg Molecules.

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Researchers found conical intersections in Rydberg atom collisions and molecules, which suppress ultracold l-changing collisions. This makes Rydberg atoms nearly transparent to ground-state atoms near these intersections.

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Area of Science:

  • Atomic physics
  • Quantum chemistry
  • Molecular spectroscopy

Background:

  • Rydberg atoms and molecules exhibit complex interactions governed by potential energy curves.
  • Conical intersections in potential energy surfaces are critical for understanding chemical dynamics and reactivity.
  • The von Neumann-Wigner theorem typically prohibits non-adiabatic transitions at conical intersections.

Purpose of the Study:

  • To investigate the occurrence and implications of conical intersections in Rydberg atom-atom collisions and Rydberg molecule structures.
  • To explore a method to circumvent the von Neumann-Wigner theorem using a synthetic dimension.
  • To identify observable consequences of these conical intersections on ultracold collision rates.

Main Methods:

  • Theoretical analysis of potential energy curves for Rydberg atom systems.
  • Utilizing the electronic energy of the Rydberg atom as a synthetic dimension.
  • Investigating the condition for conical intersection based on quantum defect and scattering phase shift.

Main Results:

  • Observed a series of conical intersections in potential energy curves for Rydberg atom collisions and Rydberg molecules.
  • Demonstrated that these conical intersections can be accessed by tuning the quantum defect relative to the scattering phase shift.
  • Showed that conical intersections lead to a strong suppression of ultracold l-changing collisions.

Conclusions:

  • Conical intersections are a significant feature in Rydberg atom systems, influencing their collisional properties.
  • The suppression of ultracold l-changing collisions near conical intersections leads to near transparency of Rydberg atoms.
  • This finding offers new insights into controlling atomic interactions and Rydberg molecule dynamics.