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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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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.
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Colors and Magnetism03:02

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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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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Multi-spin-state at a Li3PO4/LiCoO2 (104) interface.

Masato Sumita1, Takahisa Ohno2

  • 1National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. SUMITA.Masato@nims.go.jp.

Physical Chemistry Chemical Physics : PCCP
|January 27, 2016
PubMed
Summary
This summary is machine-generated.

We discovered differing spin states for cobalt atoms at the Li3PO4/LiCoO2 interface. These spin state variations do not impact the electronic band alignment between the materials.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Computational Materials Science

Background:

  • Understanding interfacial properties is crucial for advanced battery materials.
  • Lithium cobalt oxide (LiCoO2) is a key cathode material in lithium-ion batteries.
  • Interface engineering can optimize electrochemical performance.

Purpose of the Study:

  • To investigate the spin state configurations of cobalt (Co) atoms at the Li3PO4/LiCoO2 (104) interface.
  • To determine the influence of these spin states on the electronic structure and band alignment.

Main Methods:

  • Utilizing density functional molecular dynamics (DF-MD) simulations.
  • Analyzing the electronic structure and spin states of Co atoms at the interface.

Main Results:

  • Observed a disproportionation between intermediate spin (IS) and low spin (LS) configurations for Co atoms at the Li3PO4/LiCoO2 interface.
  • Demonstrated that the distribution of spin states does not alter the band alignment between Li3PO4 and LiCoO2.

Conclusions:

  • The spin state of Co atoms at the Li3PO4/LiCoO2 interface exhibits significant variation.
  • Interfacial band alignment remains unaffected by the observed spin state disproportionation, suggesting robustness in electronic coupling.