Metal borohydrides and derivatives-synthesis, structure and properties
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© The Royal Society of Chemistry 2017.A wide variety of metal borohydrides, MBH4, have been discovered and characterized during the past decade, revealing an extremely rich chemistry including fascinating structural flexibility and a wide range of compositions and physical properties. Metal borohydrides receive increasing interest within the energy storage field due to their extremely high hydrogen density and possible uses in batteries as solid state ion conductors. Recently, new types of physical properties have been explored in lanthanide-bearing borohydrides related to solid state phosphors and magnetic refrigeration. Two major classes of metal borohydride derivatives have also been discovered: anion-substituted compounds where the complex borohydride anion, BH4-, is replaced by another anion, i.e. a halide or amide ion; and metal borohydrides modified with neutral molecules, such as NH3, NH3BH3, N2H4, etc. Here, we review new synthetic strategies along with structural, physical and chemical properties for metal borohydrides, revealing a number of new trends correlating composition, structure, bonding and thermal properties. These new trends provide general knowledge and may contribute to the design and discovery of new metal borohydrides with tailored properties towards the rational design of novel functional materials. This review also demonstrates that there is still room for discovering new combinations of light elements including boron and hydrogen, leading to complex hydrides with extreme flexibility in composition, structure and properties.
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Ley, M.; Paskevicius, Mark; Schouwink, P.; Richter, B.; Sheppard, Drew; Buckley, Craig; Jensen, T. (2014)Rare earth metal borohydrides have been proposed as materials for solid-state hydrogen storage because of their reasonably low temperature of decomposition. New synthesis methods, which provide halide-free yttrium and ...
Javadian, Payam; Sheppard, Drew; Buckley, Craig; Jensen, T. (2015)The hydrogen storage properties of the eutectic melting metal borohydrides, 0.7LiBH4–0.3Ca(BH4)2, nanoconfined in two carbon aerogel scaffolds with different surface areas and pore volumes (pristine and CO2-activated) are ...
Crystal structure and in situ decomposition of Eu(BH<inf>4</inf>)<inf>2</inf> and Sm(BH<inf>4</inf>)<inf>2</inf>Humphries, Terry; Ley, M.; Frommen, C.; Munroe, K.; Jensen, T.; Hauback, B. (2015)Synthesis of halide free rare earth metal (RE) borohydride complexes is demonstrated by the metathesis reaction of trivalent RE metal chlorides and LiBH<inf>4</inf> in ethereal solution, combined with solvent extraction ...