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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Mn12 -Acetate Complexes Studied as Single Molecules.

Matthias Tombers1, Jennifer Meyer1, Jonathan Meyer1

  • 1Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern (TUK), 67663, Kaiserslautern, Germany.

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Summary
This summary is machine-generated.

Single molecule magnet (SMM) behavior in Mn12 clusters is robust, with the Mn4 core showing minimal anisotropy and the Mn8 ring exhibiting high anisotropy. These intrinsic magnetic properties are independent of the surrounding environment.

Keywords:
X-ray spectroscopyXMCD spectroscopybroken symmetry DFT modellinggaseous ionssingle ion magnetic anisotropy tensorssingle molecule magnets

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Area of Science:

  • Coordination Chemistry
  • Magnetochemistry
  • Materials Science

Background:

  • Single molecule magnet (SMM) behavior is well-established in mixed valent Mn12 coordination clusters.
  • Previous studies focused on bulk samples and surface-attached molecules.

Purpose of the Study:

  • To investigate the magnetic signature of isolated cationic Mn12 species using gas-phase spectroscopy.
  • To theoretically elucidate the magnetic properties of various Mn12 complexes.

Main Methods:

  • Gas-phase X-ray Magnetic Circular Dichroism (XMCD) spectroscopy.
  • Broken symmetry Density Functional Theory (DFT) calculations.

Main Results:

  • The magnetic signature of the isolated cationic [Mn12O12(CH3COO)15(CH3CN)]+ species closely resembles that of bulk samples.
  • DFT calculations revealed that the Mn4 core has negligible magnetic anisotropy, while the Mn8 ring is highly anisotropic.
  • These magnetic fingerprints are intrinsic properties of the Mn12 core scaffold.

Conclusions:

  • The magnetic behavior of Mn12 clusters is robust and largely independent of the molecular environment or bulk packing effects.
  • The observed SMM behavior originates from the intrinsic magnetic anisotropy of the Mn12 core structure.