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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry

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Intermediate spin ground state of an isosceles triangular [Mn(II)(3)] complex.

Sima Haddadpour1, Heiko Niedermeyer, Rodolphe Clérac

  • 1Fachbereich Chemie der Philipps-Universität Marburg, Wissenschaftliches Zentrum für Materialwissenschaften (WZMW), Hans-Meerwein-Strasse, D-35043 Marburg, Germany.

Dalton Transactions (Cambridge, England : 2003)
|October 1, 2009
PubMed
Summary

A new manganese-germanium-selenide compound, [Mn(tmeda)3][GeSe3(OMe)]2, was synthesized. It features an isosceles triangle of manganese ions with antiferromagnetic coupling and an S=3/2 ground state.

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Exploration of novel metal-selenide compounds is crucial for developing new functional materials.
  • Understanding magnetic coupling in transition metal complexes provides insights into molecular magnetism.

Purpose of the Study:

  • To synthesize and characterize a new manganese-germanium-selenide complex.
  • To investigate the magnetic properties and ground state of the synthesized compound.

Main Methods:

  • Synthesis via reaction of K4(H2O)3[Ge2Se6] with MnCl2.4H2O in methanol-tmeda.
  • Structural characterization of the resulting compound, [Mn(tmeda)3][GeSe3(OMe)]2.
  • Magnetic susceptibility measurements to determine magnetic coupling and ground state.

Main Results:

  • Successful synthesis of the novel compound [Mn(tmeda)3][GeSe3(OMe)]2.
  • Observation of an isosceles triangular arrangement of Mn(2+) ions in the crystal structure.
  • Experimental evidence of antiferromagnetic coupling between Mn(2+) ions, leading to an S=3/2 ground state.

Conclusions:

  • The synthesized compound represents a new class of manganese-germanium-selenide materials.
  • The observed magnetic behavior is consistent with theoretical predictions for triangular clusters.
  • This study contributes to the field of molecular magnetism with a new antiferromagnetically coupled system.