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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

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Published on: May 15, 2015

Static compression of tetramethylammonium borohydride.

Douglas Allen Dalton¹, M Somayazulu, Alexander F Goncharov

¹Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, USA.

The Journal of Physical Chemistry. A

|September 22, 2011

Summary

High pressure studies on tetramethylammonium borohydride (TMAB) reveal structural transitions driven by molecular ordering, not chemical bonding changes. These reversible transitions occur around 5 and 20 GPa, with a bulk modulus of 5.9 GPa.

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Area of Science:

Materials Science
Solid State Chemistry
High-Pressure Physics

Background:

Tetramethylammonium borohydride (TMAB) is an ionic compound with potential applications.
Understanding its behavior under pressure is crucial for materials science.

Purpose of the Study:

To investigate the high-pressure structural behavior of TMAB using Raman spectroscopy and synchrotron X-ray diffraction.
To determine the pressure-induced structural transitions and their mechanisms.

Main Methods:

Raman spectroscopy and synchrotron X-ray diffraction were employed to study TMAB up to 40 GPa at room temperature.
Rietveld analysis and Le Bail fits were used to analyze diffraction data.
Pressure-volume equation of state was determined.

Main Results:

Weak pressure-induced structural transitions were observed around 5 and 20 GPa.
Transitions involve orientational ordering of BH(4)(-) tetrahedra and tilting of (CH(3))(4)N(+) groups.
The bulk modulus was determined to be K(0) = 5.9(6) GPa, with K(0)' = 9.6(4).
Transitions showed reversibility with hysteresis.
No bonding changes between ionic species or activation of dihydrogen bonding were observed.

Conclusions:

The structural transitions in TMAB under high pressure are primarily driven by molecular reorientation.
TMAB exhibits reversible structural changes with hysteresis up to 40 GPa.
The compound's bulk modulus is comparable to similar materials like ammonia borane.