Single crystals of the isotypic hydrides Ba 2 H 3 X (X = Cl or Br) were obtained by solid-state reactions of Ba, NaCl, NaNH 2 and metallic Na, or Ba, NH 4 Br and Na, respectively, in sealed, silicajacketed stainless-steel ampoules. The crystal structures of the new compounds were determined by means of single crystal X-ray diffraction. Ba 2 H 3 Cl and Ba 2 H 3 Br crystallize in a stuffed anti CdI 2 structure and adopt the space group P3m1 (No. 164) with the lattice parameters a = 443.00(6), c = 723.00(14) pm and a = 444.92(4), c = 754.48(14) pm, respectively. The hydride positions are derived by crystallographic reasoning and with the help of EUTAX calculations. The results are compared with known data for binary and ternary alkaline earth metal hydrides.

Dichroic, pink to blue single crystals of Sr7H12Cl2 and Sr7H12Br2 were obtained by reacting Sr with SrX2 or NaX and NaNH2 or NH4X (X = Cl, Br) as hydrogen sources in a Na melt at 900 °C for 12 h in silica-jacketed stainless-steel or Ta ampoules. The crystal structures of the new compounds were determined by means of single crystal X-ray diffraction. Both title compounds crystallize isotypically to Ba7Cl2F12 in the hexagonal space group P6̅ (no. 174) with the lattice parameters a = 998.06(3), c = 392.84(3) pm for Sr7H12Cl2 and a = 1004.62(3), c = 399.68(3) pm for Sr7H12Br2. The hydride positions taken from the difference Fourier map agree with those of the fluorides of the isotypic compound Ba7F12Cl12. The validity of our structural results is corroborated by EUTAX calculations and the comparison to SrH2, SrX2 and SrHX.

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Strontium I 1400Syntheses and Crystal Structures of Sr7H12X2 (X: Cl, Br). -Sr7H12Cl2 is prepared by reaction of a Sr/NaCl/NaNH 2 mixture in a sodium melt (900°C, 12 h; 50% yield) and Sr7H12Br2 is obtained from a Sr/SrBr2/NaNH2 mixture under the same conditions (75% yield). The new compounds are isotypic with Ba7F12Cl2 and crystallize in the hexagonal space group P6 with Z = 1 (single crystal XRD). -(RECKEWEG*, O.; MOLSTAD, J. C.; LEVY, S.; HOCH, C.; DISALVO, F. J.; Z. Naturforsch., B: Chem.