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¹H NMR: Complex Splitting01:13

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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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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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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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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
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Mechanistic insight into proton-coupled mixed valency.

Luke A Wilkinson1, Kevin B Vincent2, Anthony J H M Meijer3

  • 1Department of Chemical Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK. n.j.patmore@hud.ac.uk and Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK.

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Electron transfer stabilizes mixed-valence molybdenum complexes. Proton transfer within bridging ligands influences this process, with calculations revealing a dipole moment change driving electron transfer.

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Area of Science:

  • Inorganic Chemistry
  • Electrochemistry
  • Computational Chemistry

Background:

  • Mixed-valence metal complexes exhibit unique electronic properties.
  • Electron transfer (ET) is a fundamental process in redox-active molecules.
  • The interplay between proton transfer and electron transfer is crucial for understanding molecular mechanisms.

Purpose of the Study:

  • To investigate the mechanism of electron transfer in stabilizing the mixed-valence state of a dinuclear molybdenum complex.
  • To elucidate the relationship between proton transfer and electron transfer in [Mo2(TiPB)3(HDOP)]2+.
  • To determine the rate of electron transfer using spectroelectrochemical and computational methods.

Main Methods:

  • Spectroelectrochemistry was employed to study the electronic transitions and redox behavior.
  • Density Functional Theory (DFT) calculations were utilized to model the molecular structure and electronic properties.
  • Proton transfer events were analyzed in conjunction with electron transfer dynamics.

Main Results:

  • Electron transfer (ET) plays a key role in stabilizing the mixed-valence state of the dinuclear molybdenum complex [Mo2(TiPB)3(HDOP)]2+.
  • Spectroelectrochemical data indicate ET rates slower than 10^9 s(-1).
  • DFT calculations demonstrate that proton transfer induces a significant molecular dipole moment change, facilitating ET.

Conclusions:

  • The stabilization of the mixed-valence state is intrinsically linked to the proton coordinate of bridging ligands.
  • Proton transfer is a critical factor modulating electron transfer dynamics in this system.
  • The findings provide insights into the coupled proton-electron transfer mechanisms in inorganic complexes.