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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

10.9K
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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Valence Bond Theory02:45

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Overview of Valence Bond Theory
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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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.
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 involved orbitals. The...
1.4K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.5K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

5.2K
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
5.2K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.7K
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.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.7K

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Updated: Dec 25, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Universal A-Cation Splitting in LiNbO3-Type Structure Driven by Intrapositional Multivalent Coupling.

Yifeng Han1, Yijie Zeng2, Mylène Hendrickx3

  • 1Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.

Journal of the American Chemical Society
|March 29, 2020
PubMed
Summary
This summary is machine-generated.

We discovered Zn-ion splitting in LiNbO3-type polar magnets, revealing a universal atomic splitting in these multiferroic materials. This splitting is influenced by magnetic interactions and cation bonding, offering insights into ferroelectric mechanisms.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Understanding ferroelectric mechanisms in multiferroic materials is crucial for electric dipole switching.
  • The atomic-scale local structure evolution in high-pressure prepared LiNbO3-type polar magnets remains unclear.
  • A solid experimental indicator for ferroelectric mechanisms in these materials is lacking.

Purpose of the Study:

  • To investigate the atomic-scale local structure evolution in LiNbO3-type polar magnets.
  • To discover experimental indicators for ferroelectric mechanisms.
  • To understand the role of Zn-ion splitting in Zn2FeNbO6.

Main Methods:

  • Multiple diffraction techniques, including powder X-ray diffraction structural refinements.
  • High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM).
  • Theoretical calculations.

Main Results:

  • Discovery of Zn-ion splitting in LiNbO3-type Zn2FeNbO6.
  • Verification of A-site atomic splitting in mixed Zn2FeTaO6 and ZnTaO2N, absent in ZnSnO3.
  • Theoretical confirmation of A-site splitting in Mn-analogues, with smaller splitting due to magnetic interactions.

Conclusions:

  • A universal A-site splitting exists in LiNbO3-type structures with mixed cations or anionic sites.
  • Atomic splitting/displacement is suppressed by magnetic interactions and valence band hybridization.
  • Findings provide insights into ferroelectric mechanisms and material design.