US EPA

1680477 

Journal Article 

Synthesis and structure of the basic alkaline earth nitrates Sr-2(OH)(3)NO3 and Ba-2(OH)(3)NO3 

Dill, S; Gibson, K; Glaser, J; Tragl, S; Meyer, HJ 

2007 

1 

Zeitschrift fuer Anorganische und Allgemeine Chemie
ISSN: 0044-2313 

633 

2 

274-279 

10.1002/zaac.200600251 

WOS:000243613400014 

Sr-2(OH)(3)NO3 and Ba-2(OH)(3)NO3 were synthesized from mixtures of freshly prepared strontium or barium hydroxides and their corresponding nitrates in evacuated quartz glass ampoules at 420 degrees C and 360 degrees C, respectively. Single crystals of Sr-2(OH)(3)NO3 were obtained in a solidified Sr(NO3)(2) melt after subsequent heating and cooling cycles in air up to 600 degrees C. The crystal structure of the strontium compound was refined from single crystal and powder X-ray data. Sr-2(OH)(3)NO3 crystallizes hexagonally in the space group P62m (No. 189) with Z = 1 and the lattice parameters a = 6.624(2) angstrom and c = 3.560(1) angstrom (single crystal data). The powder pattern of Ba-2(OH)(3)NO3 was indexed isotypically to Sr-2(OH)(3)NO3 with the lattice parameters a = 6.9260(1) angstrom and c = 3.8086(1) angstrom, and the crystal structure was refined from powder X-ray data. Alkaline earth ions in the structures are surrounded trigonal-prismatically by six hydroxide ions. These prisms are sharing their trigonal faces along [001] building up columns. These columns are connected in the ab-plane by shared edges, and form hexagonal tunnels with the nitrate groups stacked inside. Infrared and thermoanalytical data of Sr-2(OH)(3)NO3 are presented. 

alkaline earth; hydroxide nitrate; crystal structure