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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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Related Experiment Video

Updated: Oct 7, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Self-assembly of non-macrocyclic triangular Ni₃Ln clusters.

Tyson N Dais¹, Rina Takano², Takayuki Ishida²

¹School of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand. p.g.plieger@massey.ac.nz.

Dalton Transactions (Cambridge, England : 2003)

|January 5, 2022

Summary

Researchers synthesized four new heterometallic tetranuclear complexes. One complex with Gadolinium (Gd) showed dominant ferromagnetic interactions, indicating potential for advanced magnetic materials.

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Area of Science:

Inorganic Chemistry
Materials Science
Magnetochemistry

Background:

Heterometallic complexes offer tunable properties for advanced applications.
Lanthanide and transition metal ions can create unique magnetic behaviors.

Purpose of the Study:

To synthesize and characterize novel heterometallic tetranuclear complexes.
To investigate the magnetic properties of these newly formed complexes.
To explore self-assembly pathways for Ni-Ln/Ba cores.

Main Methods:

X-ray crystallography for structural elucidation.
Direct Current (DC) and Alternating Current (AC) magnetic susceptibility measurements.
Self-assembly synthesis from acyclic ligands and metal salts.

Main Results:

Four new heterometallic tetranuclear complexes (L3Ni3Ln and L3Ni3Ba) were successfully synthesized.
Structural characterization revealed a common near-planar Ni3MO12 core in all complexes.
Complex C3 (Ni3Gd) exhibited dominant ferromagnetic interactions with a spin ground state of 13/2.
No slow relaxation of magnetization was observed in AC magnetic susceptibility experiments.

Conclusions:

The study demonstrates a facile self-assembly route to Ni-Ln/Ba tetranuclear complexes.
Ferromagnetic interactions in the Ni3Gd complex suggest potential for molecular magnetism.
Further studies are needed to explore applications based on these magnetic properties.