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Polymorphism of dimethylaminoborane N(CH₃)₂-BH₂.

Alexander Bodach¹, Thomas Bernert¹, Michael Fischer²

¹Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials

|April 12, 2021

Summary

Dimethylaminoborane undergoes dehydrocoupling to form cyclic structures. This study determined the monoclinic crystal structure of dimethylaminoborane, revealing its phase transition behavior and energetic stability.

Keywords:

dimethylamnoborane hydrogen storage in situ polymorphism powder diffraction

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Published on: February 15, 2016

Area of Science:

Inorganic Chemistry
Crystallography
Materials Science

Background:

Dimethylamine-borane adducts are precursors to aminoboranes.
Aminoboranes can form cyclic dimers or trimers with varying structures.
Polymorphism in dimethylaminoborane affects its stability and properties.

Purpose of the Study:

To investigate the dehydrocoupling of dimethylamine-borane.
To determine the crystal structure of dimethylaminoborane polymorphs.
To understand the phase transition behavior and energetic stability of dimethylaminoborane.

Main Methods:

Synthesis of dimethylaminoborane via dehydrocoupling.
X-ray diffraction analysis (powder and single-crystal).
Differential scanning calorimetry (DSC) for phase transition studies.

Main Results:

Dimethylaminoborane crystallizes as a dimer (triclinic) or trimer (orthorhombic).
The trimeric, six-membered ring structure is energetically more stable due to denser packing.
A phase transition from the triclinic to a monoclinic polymorph occurs above 290 K.
The monoclinic crystal structure (space group C2/m) was determined from powder diffraction data.

Conclusions:

The synthesis conditions dictate the crystalline form of dimethylaminoborane.
The monoclinic polymorph represents a stable phase at higher temperatures.
Understanding the polymorphism is crucial for controlling the properties of dimethylaminoborane.