Abstract
The crystal structure of strontium nitroprusside tetrahydrate (Sr[Fe(CN)5NO] · 4H2O) has been determined with a better than standard precision by X-ray diffraction on single crystals at room temperature: monoclinic; space group C2/m; a = 20.109(4), b = 7.616(5), c = 8.398(3) Å; β = 98.7(5)°; V = 1271(2) Å3; Z = 4; Mr = 375.6; Dx = 1.96 g cm-3; final R = 0.027 for 1567 observed structure factors. The positions of three hydrogen atoms were found. The results show two different sites, with occupation factors of 2/3 and 1/3, for one oxygen-water atom located in a general position within the asymmetric unit. Analysis of distances between neighboring water oxygens and of possible hydrogen bonds indicates that different strontium coordination polyhedra exist in the crystal. These are connected in zig-zag chains along the [0 1 0] direction by short contacts between water oxygens, suggesting the existence of an infinite network of hydrogen bonds of periodicity three times the cell parameter b.
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