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A single phase Mg(BH 4 ) 2 was successfully synthesized and its hydrogen storage properties were systematically investigated. Depending on the synthesis conditions, Mg(BH 4 ) 2 forms low-and high-temperature phases with different crystal structures. The dehydriding reaction of Mg(BH 4 ) 2 starts at approximately 500 K, and 14.4 mass% of hydrogen is released through a multi-step reaction. Furthermore, 6.1 mass% of hydrogen can be rehydrided for the sample of Mg(BH 4 ) 2 after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB 12 H 12 .

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Two-dimensional and multi-layered perovskites, [NH3(CH2)12NH3]PbBr4 and [NH3(CH2)12NH3](CH3NH3)(n-1)Pb(n)Br(3n+1), with a quantum confinement effect have been naturally formed by intercalating lead bromide into organic alkyldiammonium bromide frameworks.