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Mg(NO 3 ) 2 , Co(NO 3 ) 2  and Ni(NO 3 ) 2  were obtained as tiny crystals by dehydration of melts of the respective hydrates in the range 410–450 K. Structure determinations and refinements are based on single crystal X-ray data (CCD area detector) measured at 120–370 K. Crystal parameters at 120 K: Mg(NO 3 ) 2 :  R −3,  a  = 10.474(1),  c  = 38.782(4) Å,  Z  = 36,  R  1  = 0.028; Co(NO 3 ) 2 :  R −3,  a  = 10.445(1),  c  = 12.769(2) Å,  Z  = 12,  R  1  = 0.019; Ni(NO 3 ) 2 :  R −3,  a  = 10.332(1),  c  = 12.658(2) Å,  Z  = 12,  R  1  = 0.025. Co(NO 3 ) 2  and Ni(NO 3 ) 2  are isotypic; the structure of Mg(NO 3 ) 2  is closely related, although it is not simply a stacking variant – it forms a new structure type. In all three compounds the MO 6  octahedra share all corners with the NO 3  groups to form framework structures; any edge sharing is thereby avoided. The geometries of the structures are also discussed in relation to a simple theoretical cubic structure (space group  Pa −3) with the same connection pattern of the MO 6  and NO 3  building units. Neither X-ray single crystal and powder work nor differential thermoanalytical investigations indicated polymorphism in the temperature range investigated.

zeitschrift für kristallographie - crystalline materials 

Investigation of anhydrous metal(II) nitrates. I. Syntheses and crystal structures of Mg(NO 3 ) 2 , Co(NO 3 ) 2  and Ni(NO 3 ) 2 , with a stereochemical discussion