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Valence Bond Theory

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...

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

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

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Published on: April 14, 2020

One-dimensional lanthanide coordination polymers: synthesis, structures, and single-ion magnetic behaviour.

Hung-Kai Feng¹, Po-Jung Huang, Hui-Lien Tsai

¹Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China. hltsai@mail.ncku.edu.tw.

Dalton Transactions (Cambridge, England : 2003)

|January 22, 2015

Summary

Researchers synthesized isostructural lanthanide compounds. These materials exhibit slow magnetic relaxation, with compound 2 showing a dominant thermally activated relaxation process, indicating potential for magnetic applications.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Area of Science:

Coordination Chemistry
Magnetochemistry
Materials Science

Background:

Lanthanide compounds are of interest for their unique magnetic properties.
One-dimensional (1D) coordination polymers offer specific structural arrangements for magnetic interactions.

Purpose of the Study:

To synthesize and structurally characterize a series of isostructural 1D lanthanide compounds.
To investigate the static and dynamic magnetic properties of these novel materials.

Main Methods:

Synthesis of lanthanide compounds with the formula [Ln(III)(L)(NO3)(DMF)2]∞.
Structural characterization using X-ray diffraction.
Magnetic susceptibility measurements (dc and ac) to analyze magnetic behavior.

Main Results:

Four isostructural 1D lanthanide compounds (Ln = Tb, Dy, Ho, Er) were successfully synthesized and characterized.
DC magnetic susceptibility indicated thermal depopulation of crystal field-split mJ levels.
Compounds 1 (Tb), 2 (Dy), and 4 (Er) exhibited slow magnetic relaxation, with energy barriers of 6.15 K, 54.45 K, and 28.14 K, respectively.
Compound 2 displayed characteristic signals for a predominantly thermally activated relaxation process.

Conclusions:

The synthesized 1D lanthanide compounds possess interesting magnetic properties.
The observed slow relaxation of magnetization suggests potential for single-molecule magnet behavior.
Compound 2 is a promising candidate for further investigation due to its thermally activated relaxation.