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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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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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Color in Coordination Complexes
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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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Spin-phonon coupling and dynamic zero-field splitting contributions to spin conversion processes in iron(II)

Nicholas J Higdon1, Alexandra T Barth1, Patryk T Kozlowski1

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Spin-phonon coupling in transition metal complexes is crucial for magnetization dynamics. This study develops a model to understand how coupling terms influence spin conversion and molecular properties.

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Area of Science:

  • Molecular Magnetism
  • Quantum Computing
  • Photophysics

Background:

  • Spin-phonon coupling is key to magnetization dynamics in transition metal complexes, impacting single molecule magnets, qubits, and photophysics.
  • Understanding spin-phonon coupling is essential for molecular engineering but requires further fundamental studies.

Purpose of the Study:

  • To develop a model defining spin-phonon coupling terms in S=2 transition metal complexes.
  • To investigate how coupling originates from ground and excited states.
  • To link ligand field dynamics to spin conversion processes.

Main Methods:

  • Combined ligand field theory and multireference ab initio modeling.
  • Analysis of dynamic zero-field splitting (ZFS) contributions from excited states.
  • Evaluation of intramolecular coupling term ratios to analyze intersystem crossing (ISC).

Main Results:

  • Spin-phonon couplings arise from static and dynamic properties of ground and excited states.
  • Ligand field dynamics influence excited state origins of ZFS along normal modes.
  • Ratios of intramolecular coupling terms drive spin conversion and reveal ISC mechanisms.

Conclusions:

  • Geometric structure variations significantly impact spin-phonon coupling and spin dynamics.
  • The findings connect spin-phonon coupling across single molecule magnetism, quantum materials/qubits, and photophysics.
  • This work provides a framework for leveraging spin-phonon coupling in molecular design.