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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

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Published on: December 29, 2016

A square-pyramidal organochromium(V) compound.

M Angeles García-Monforte¹, Pablo J Alonso, Ana B Arauzo

¹Instituto de Síntesis Química y Catálisis Homogénea, Universidad de Zaragoza-C.S.I.C., C/Pedro Cerbuna 12, E-50009, Zaragoza, Spain.

Dalton Transactions (Cambridge, England : 2003)

|December 3, 2011

Summary

This summary is machine-generated.

A new chromium(V) compound, [CrO(C(6)F(5))(4)](-), was synthesized and characterized. This organochromium complex exhibits paramagnetic behavior in solution and weak ferromagnetic interactions in the solid state.

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Area of Science:

Organometallic Chemistry
Inorganic Chemistry
Materials Science

Background:

Organochromium compounds are of interest for their unique electronic and magnetic properties.
Understanding the structure-property relationships in high-valent chromium complexes is crucial for developing new materials.

Purpose of the Study:

To synthesize and characterize a novel mononuclear, five-coordinate organochromium(V) compound.
To investigate the electronic structure and magnetic properties of the synthesized compound in solution and solid states.

Main Methods:

Synthesis of the chromium(V) compound using a chromium(III) precursor, NO[BF(4)], and an oxygen atmosphere.
X-ray crystallography to determine the solid-state structure and geometry.
Electron Paramagnetic Resonance (EPR) spectroscopy to study solution behavior and hyperfine interactions.
Magnetic susceptibility measurements and isothermal magnetization to probe magnetic interactions.

Main Results:

The mononuclear, five-coordinate organochromium(V) compound [NBu(4)][CrO(C(6)F(5))(4)] was successfully synthesized.
X-ray analysis revealed a square-pyramidal geometry for the [CrO(C(6)F(5))(4)](-) anion with a short Cr-O bond, indicating triple bond character.
EPR spectroscopy confirmed the paramagnetic nature of the complex in solution, with hyperfine coupling to Cr-53 and F substituents.
Solid-state magnetic studies indicated weak ferromagnetic interactions with a Curie temperature (T(C)) of 0.20(2) K.

Conclusions:

The synthesized organochromium(V) complex displays distinct magnetic behaviors in solution and solid states.
The observed ferromagnetic interactions in the solid state are likely mediated by pi interactions between the pentafluorophenyl rings.
This study provides insights into the coordination chemistry and magnetic properties of high-valent organochromium compounds.