
%0 Journal Article
%A Diakiw, V 
%A Hambley, TW 
%A Kepert, DL 
%A Raston, CL 
%A White, AH 
%T Crystal Structure of Calcium Picrate Pentahydrate: A New Eight-Coordinate Stereochemistry for [M(bidentate)<sub>2</sub>(unidentate)<sub>4</sub>]
%J Australian Journal of Chemistry
%D 1979/02/01
%V 32
%N 2
%P 301-309
%K 
%R https://doi.org/10.1071/CH9790301
%U https://www.publish.csiro.au/paper/CH9790301 
%X The crystal structure of the title compound, Ca(C6H2N307)2,5H2O, has been determined by single-crystal X-ray diffraction at 295(1) K and refined by least squares to a residual of 0.049 for 1513 'observed' reflections. Crystals are orthorhombic, Pmab, a 24.169(6), b l0.292(7), c 8.554(2) Å, Z 4. The stereochemistry about the calcium has not been observed previously for the system [M(bidentate)2- (unidentate)4]; in the present structure, the calcium is coordinated by a pair of bidentate picrate ligands and the four water molecules in an array in which three of the water molecules occupy a triangular face of a square antiprism, the overall array having m symmetry. The remaining water molecule occupies a lattice site with no close interaction with the other species. 
