Synthesis and crystal structure of Ammonium Strontium hexacyanoferrate (II) dihydrate

L. MEDINA CÓRDOBA; J. A. MORÁN; S. SANTOS JR; O. E. PIRO; M. I. GÓMEZ

JOURNAL OF CHEMICAL CRYSTALLOGRAPHY

SPRINGER/PLENUM PUBLISHERS

Lugar: New York; Año: 2011 vol. 41 p. 1280 - 1284

1074-1542

The molecular structure of Sr(NH4)2[Fe(CN)6].2H2O, was determined by X-ray diffraction methods. It crystallizes in the orthorhombic Pnma space group with a=13.1420(3), b=14.1656(4), c=7.3364(2) Å, and Z=4. The structure was solved and refined. The iron(II) complex is located on a crystallographic inversion center with the metal in a nearly perfect octahedral environment [Fe-C bond distances from 1.919(4) to 1.939(4) Å]. The Sr(II) ion lies on a crystallographic mirror plane, sandwiched between two nearly square Archimedean anti-prism basis, angled 45º from each other. One base is formed by the two water molecules located on the mirror plane [Sr?Ow distances of 2.741(4) and 2.636(4) Å] and by a pair of mirror-related cyanide N-atom [d(Sr?N)=2.676(3) Å], the other one by two pairs of mirror-related cyanide nitrogen atoms [Sr?N distances of 2.649(3) and 2.640(4) Å] of neighboring [Fe(CN)6]4- anions. The infrared absorption spectrum of the compound was also recorded and briefly discussed.