Performing under pressure: The BH4 group in the high-pressure modification of LiBH4 has an unprecedented square-planar coordination by four Li atoms (see picture). This structure exhibits a strikingly short H⋅⋅⋅H contact between adjacent BH4 anions and thus may show completely different hydrogen-storage properties if stabilized by chemical substitution at ambient pressure.
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Filinchuk et al. (2007) studied this question.
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