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Ferromagnetism01:31

Ferromagnetism

2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.2K
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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Valence Bond Theory02:42

Valence Bond Theory

8.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.3K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.3K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.4K
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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Three-leaf quantum interference clovers in a trigonal single-molecule magnet.

James H Atkinson1, Ross Inglis2, Enrique del Barco1

  • 1Department of Physics, University of Central Florida, Orlando, Florida 32765, USA.

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|September 6, 2014
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Single-molecule magnets exhibit clover-like quantum tunneling patterns due to trigonal symmetry. This modulation, influenced by spin-orbit coupling and magnetic fields, reveals insights into molecular magnetism.

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Area of Science:

  • Quantum physics
  • Materials science
  • Chemistry

Background:

  • Single-molecule magnets (SMMs) are crucial for developing molecular quantum devices.
  • Understanding quantum tunneling of magnetization (QTM) is key to SMM functionality.
  • Spin-orbit coupling (SOC) significantly influences magnetic properties in molecules.

Purpose of the Study:

  • To investigate the angular modulations in magnetization tunneling rates and quantum interference patterns in a specific single-molecule magnet.
  • To correlate observed patterns with the spatial arrangement of manganese ions and SOC tensor orientations.
  • To explore the role of longitudinal and transverse magnetic fields in QTM phenomena.

Main Methods:

  • Experimental synthesis and characterization of a single-molecule magnet with trigonal symmetry.
  • Measurement of magnetization tunneling rates and quantum interference patterns under varying magnetic fields.
  • Theoretical modeling to interpret the observed angular modulations and their relation to SOC.

Main Results:

  • Observed threefold angular modulations in tunneling rates and interference patterns, resembling a three-leaf clover.
  • Threefold modulation appears at specific resonances (|k|>0) under longitudinal magnetic fields.
  • Sixfold transverse field modulation at resonance k=0 arises from SOC energy landscape corrugation.

Conclusions:

  • The study establishes a link between trigonal molecular symmetry, SOC, and QTM behavior in SMMs.
  • The findings demonstrate how local SOC distortions dictate magnetic field responses.
  • This understanding can be applied to designing and optimizing other molecular magnetic materials.