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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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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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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Relation between molecular electronic structure and nuclear spin-induced circular dichroism.

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Area of Science:

  • Molecular Spectroscopy
  • Quantum Chemistry
  • Biophysics

Background:

  • Nuclear spin-induced circular dichroism (NSCD) is a recently described theoretical method.
  • NSCD combines optical excitations and hyperfine interactions for optical detection of nuclear magnetization.
  • It offers potential for spatially localized, high-resolution spectroscopic information.

Purpose of the Study:

  • To investigate the relationship between molecular/electronic structure and NSCD signals.
  • To theoretically examine NSCD in adenine, guanine, thymine, and cytosine.
  • To understand factors influencing NSCD spectra.

Main Methods:

  • Theoretical investigation of NSCD for twenty structures of four nucleic acid bases.
  • Analysis of excited state spatial distribution and couplings.
  • Rationalization using electronic density changes and a sum-over-states approach.

Main Results:

  • NSCD signal correlates with excited state distribution and couplings, reflecting structural changes.
  • This contrasts with NMR chemical shift, which reflects only ground state structure.
  • Two distinct contributions to NSCD were identified with discussed origins and magnitudes.

Conclusions:

  • NSCD spectroscopy is a viable tool for identifying molecules.
  • It can distinguish between different molecular structures and conformations.
  • The method provides insights into electronic density and excited state contributions.