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Related Concept Videos

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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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.1K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Isomerism02:43

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18.6K
Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
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Updated: Jul 25, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB.

T J Gray1, J M Allmond1, Z Xu2

  • 1Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

Physical Review Letters
|June 30, 2023
PubMed
Summary
This summary is machine-generated.

Researchers observed a unique microsecond isomer in Sodium-32 using the Facility for Rare Isotope Beams (FRIB). This finding provides crucial insights into nuclear shape transitions and theoretical models.

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Area of Science:

  • Nuclear Physics
  • Rare Isotope Research
  • Atomic Spectroscopy

Background:

  • The Sodium-32 nucleus is central to the N=20 island of shape inversion.
  • It lies at the intersection of spherical shell-model, deformed shell-model, and ab initio theories.
  • Understanding its structure is key to nuclear structure theories.

Purpose of the Study:

  • To report excited-state spectroscopy from the first experiment at FRIB.
  • To characterize a newly observed microsecond isomer in ^{32}Na.
  • To investigate the shape degrees of freedom in ^{32}Na and its relation to ^{32}Mg.

Main Methods:

  • Utilized the FRIB Decay Station initiator (FDSi) for experiments.
  • Observed gamma rays in coincidence with ^{32}Na nuclei.
  • Performed excited-state spectroscopy.

Main Results:

  • A 24(2)-μs isomer in ^{32}Na was identified, the only known microsecond isomer in this region.
  • Observed a cascade of 224- and 401-keV γ rays.
  • The results favor a 0+ deformed spin isomer decaying by M2, indicating dominant deformation in low-lying states.

Conclusions:

  • The observed isomer formation in ^{32}Na offers a sensitive probe of nuclear shape.
  • The findings support the dominance of deformation in the low-lying states of ^{32}Na.
  • This study advances the understanding of shape inversion phenomena in atomic nuclei.