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Crystals of Mg(NO 3 ) 2 ·2H 2 O were prepared by evaporation of MgO solution in HNO 3  (fuming). The crystals are monoclinic with  a  = 5.81 ± 0.01 Å,  b  = 5.99 ± 0.01 Å,  c  = 8.65 ± 0.01, Å,  β  = 90°40′ ± 10′ and  Z  = 2. The space group is  P 2 1 / c – C  2 h   5 . The magnesium atoms are surrounded by a distorted octahedron composed of four oxygen atoms belonging to two nitrate ions and of two oxygen atoms belonging to two water molecules. The magnesium–oxygen distances have values between 2.050 and 2.139 Å. Magnesium nitrate dihydrate has a layer structure parallel to (100). The layers are linked together by hydrogen bonds. The final  R  value is 10.4%.

Die Kristallstruktur von Mg(NO 3 ) 2 · 2H 2 O