Novel Alkali Earth Borohydride Sr(BH4)2 and Borohydride-Chloride Sr(BH4)Cl

D.B. Ravnsbæk, E.A. Nickels, R. Černý, C.H. Olesen, W.I.F. David, P.P. Edwards, Y. Filinchuk, T.R. Jensen

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Abstract

Two novel alkali earth borohydrides, Sr(BH) and Sr(BH)Cl, have been synthesized and investigated by in-situ synchrotron radiation powder X-ray diffraction (SR-PXD) and Raman spectroscopy. Strontium borohydride, Sr(BH), was synthesized via a metathesis reaction between LiBH and SrCl by two complementary methods, i.e., solvent-mediated and mechanochemical synthesis, while Sr(BH)Cl was obtained from mechanochemical synthesis, i.e., ball milling. Sr(BH) crystallizes in the orthorhombic crystal system, a = 6.97833(9) Å, b = 8.39651(11) Å, and c = 7.55931(10) Å (V = 442.927(10) Å) at RT with space group symmetry Pbcn. The compound crystallizes in α-PbO structure type and is built from half-occupied brucite-like layers of slightly distorted [Sr(BH)] octahedra stacked in the a-axis direction. Strontium borohydride chloride, Sr(BH)Cl, is a stoichiometric, ordered compound, which also crystallizes in the orthorhombic crystal system, a = 10.8873(8) Å, b = 4.6035(3) Å, and c = 7.4398(6) Å (V = 372.91(3) Å) at RT, with space group symmetry Pnma and structure type Sr(OH). Sr(BH)Cl dissociates into Sr(BH) and SrCl at ∼170 C, while Sr(BH) is found to decompose in multiple steps between 270 and 465 C with formation of several decomposition products, e.g., SrB . Furthermore, partly characterized new compounds are also reported here, e.g., a solvate of Sr(BH) and two Li-Sr-BH compounds.
OriginalsprogEngelsk
TidsskriftInorganic Chemistry
Vol/bind52
Nummer19
Sider (fra-til)10877-10885
Antal sider9
ISSN0020-1669
DOI
StatusUdgivet - 2013

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