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Valence Bond Theory

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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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Related Experiment Video

Updated: Jun 11, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Published on: November 22, 2016

Al3Li4(BH4)13: a complex double-cation borohydride with a new structure.

Inge Lindemann¹, Roger Domènech Ferrer, Lothar Dunsch

¹IFW Dresden, Dept. 21, Helmholtzstrasse 20, 01069 Dresden, Germany. I.Lindemann@ifw-dresden.de

Chemistry (Weinheim an Der Bergstrasse, Germany)

|June 29, 2010

Summary

A novel aluminum-lithium-borohydride material offers efficient hydrogen storage with a low 70°C desorption temperature and high 17.2 wt% hydrogen density. This material exhibits a unique 3D framework structure, making it promising for hydrogen storage applications.

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Area of Science:

Materials Science
Inorganic Chemistry
Hydrogen Storage

Background:

Developing advanced materials for efficient hydrogen storage is crucial for clean energy technologies.
Borohydride-based materials are investigated for their high hydrogen content and potential for reversible hydrogen release.

Purpose of the Study:

To synthesize and characterize a new double-cation aluminum-lithium-borohydride for hydrogen storage.
To investigate the structural, thermal, and decomposition properties of this novel material.

Main Methods:

High-energy ball milling for synthesis.
Synchrotron powder diffraction and DFT calculations for structural analysis.
In situ Raman spectroscopy, DSC, TG, and thermal desorption for decomposition studies.

Main Results:

A unique 3D framework structure (space group P-43n) was identified for Al(3)Li(4)(BH(4))(13).
The material exhibits a low hydrogen desorption temperature of approximately 70°C with a high hydrogen density of 17.2 wt%.
Decomposition releases hydrogen and diborane, with a significant mass loss of ~20%.

Conclusions:

The synthesized Al-Li-borohydride is a promising candidate for hydrogen storage applications due to its favorable desorption temperature and high hydrogen density.
The unique structural framework and decomposition pathway provide insights into the behavior of complex borohydrides.
Further research may optimize this material for practical hydrogen storage systems.