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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

16.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
16.8K
Stereoisomerism02:52

Stereoisomerism

11.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.5K
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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.5K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.4K
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...
3.4K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.3K

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Interplay between local anisotropies in binuclear complexes.

Renaud Ruamps1, Rémi Maurice, Coen de Graaf

  • 1Laboratoire de Chimie et de Physique Quantiques, IRSAMC/UMR5626, Université de Toulouse 3 , 118 route de Narbonne, F-31062 Toulouse Cédex 4, France.

Inorganic Chemistry
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PubMed
Summary

Local distortions significantly impact molecular magnetic anisotropy in binuclear complexes. Understanding these effects allows for tuning magnetic properties in advanced materials.

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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Area of Science:

  • Coordination Chemistry
  • Magnetochemistry
  • Computational Chemistry

Background:

  • Molecular magnetic anisotropy is crucial for designing advanced magnetic materials.
  • Understanding the influence of local distortions on magnetic properties is essential for controlling molecular magnetism.

Purpose of the Study:

  • To systematically investigate how local distortions affect molecular magnetic anisotropies in binuclear complexes.
  • To establish rules for maximizing molecular anisotropy by controlling local magnetic anisotropy.

Main Methods:

  • Applied systematic distortions to two binuclear Nickel(II) model complexes.
  • Extracted magnetic anisotropy parameters using multispin and giant-spin model Hamiltonians.
  • Determined local and molecular magnetic axes frames.

Main Results:

  • Identified specific local distortions that lead to constructive interference of local anisotropies.
  • Demonstrated that fourth-rank tensors, not just second-rank tensors, significantly contribute to anisotropic exchange.
  • Derived simple rules for maximizing molecular anisotropy by controlling local magnetic anisotropy.

Conclusions:

  • Local distortions play a critical role in determining the overall molecular magnetic anisotropy.
  • The findings provide a pathway to tune magnetic anisotropy in binuclear and polynuclear complexes through controlled local distortions.