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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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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

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Controlled coordination in vanadium(V) dimethylhydrazido compounds.

Takashi Sakuramoto¹, Toshiyuki Moriuchi¹, Toshikazu Hirao¹

¹Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamada-oka, Suita, Osaka 565-0871, Japan.

Journal of Inorganic Biochemistry

|September 14, 2016

Summary

Vanadium(V) dimethylhydrazido compounds reveal how alkoxide ligands influence vanadium coordination geometry. Different ligands alter the vanadium center

Keywords:

Controlled coordination environment Crystal structure Metal-nitrogen multiple bond Self-association Vanadium(V) hydrazido compound

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Area of Science:

Inorganic Chemistry
Organometallic Chemistry
Coordination Chemistry

Background:

Vanadium(V) compounds are versatile in catalysis and materials science.
Understanding the coordination environment of vanadium is crucial for designing new complexes.
Dimethylhydrazido ligands offer unique coordination possibilities.

Purpose of the Study:

To structurally characterize vanadium(V) dimethylhydrazido compounds.
To elucidate the effect of various alkoxide ligands on the vanadium coordination environment.
To correlate structural features with the electronic and steric properties of ligands.

Main Methods:

Single-crystal X-ray diffraction was employed for structural determination.
Analysis of coordination geometries using the τ parameter for different vanadium complexes.
Comparison of V-N bond distances in relation to ligand type and coordination.

Main Results:

A dimeric structure with distorted trigonal-bipyramidal geometry was observed for vanadium(V) with isopropoxide ligands.
A nearly tetrahedral arrangement was found for vanadium(V) with tert-butoxide ligands.
Pseudo-trigonal-bipyramidal geometry was observed with 2,2',2″-nitrilotriethoxide, showing a longer V-N bond.

Conclusions:

Alkoxide ligands significantly influence the coordination geometry around the vanadium(V) center.
Steric bulk and coordination mode of alkoxide ligands dictate the geometry and V-N bond length.
Apical ligand coordination in vanadium(V) dimethylhydrazido compounds leads to elongated V-N distances.