Abstract: | Synthesis and Crystal Structure of Sr2Zn(OH)6 and Ba2Zn(OH)6 Crystallization from supersaturated sodium hydroxozincate solutions by adding solutions of alkali earth metal hydroxides yields crystals of Sr2Zn(OH)6 and Ba2Zn(OH)6. The X-ray structure determination on these crystals was successful including all hydrogen positions: Sr2Zn(OH)6: P21/n, Z = 2, a = 5.794(1) Å, b = 6.160(1) Å, c = 8.141(1) Å, b = 91.23(1)°, N(F ³° 2σ F) = 1127, N(Var.) = 53, R1/wR2 = 0.047/0.081Ba2Zn(OH)6: P21/n, Z = 2, a = 6.043(1) Å, b = 6.336(1) Å, c = 8.451(2) Å, b = 91.23(2)°, N(F ° 2σ F) = 1669, N(Var.) = 54, R1/wR2 = 0.029/0.067. Sr2Zn(OH)6 and Ba2Zn(OH)6 crystallize isotypic in a distorted Li2O structure type. Sr2+ resp. Ba2+ form a cubic primitive arrangement. Distorted octahedra of OH– around Zn2+ fill therein alternating cubic gaps in an ordered way. |