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Título : Crystal structure of orthorhombic ferrous nitroprusside: Fe Fe CN 5NO .2H2O
Palabras clave : ferrous nitroprusside
Mössbauer spectroscopy
Rietveld refinement
crystal structure
Fecha de publicación : 16-ene-2013
Editorial : Powder Diffraction
Descripción : Ferrous nitroprusside can be obtained in three structural modifications: two different unstable phases, monoclinic trihydrate and cubic pentahydrate, and the stable one, an orthorhombic dihydrate. This contribution reports the crystal structure of the last one. Cell parameters are: a =13.9734 s2d, b=7.4274 s1d, and c=10.4697 s1d Å; with four formula units per cell sZ=4d. The crystal structure was refined from the corresponding XRD powder pattern using the Rietveld method. Final agreement factors of the refinement process were Rwp=8.46, Rp=6.54, and S=1.38. The crystal structure is formed by a tridimensional assembling of the fFesCNd5NOg molecular block through iron atoms bounded at the N end of the CN ligands. The NO group remains unlinked at its O atom. The octahedral coordination of the assembling metal is completed with a coordinated water molecule which stabilizes a second water through a strong hydrogen bond interaction. The tridimensional structure appears as piled up rippled sheets leading to a system of interconnected small cavities which increase their available volume on the material dehydration. This complex loses its crystal water below 100 °C and then remains stable up to above 160 °C when the decomposition process begins with the loss of the NO ligand. © 2005 International Centre for Diffraction Data. fDOI: 10.1154/1.1872874g
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/11342
Otros identificadores : Powder Diffraction 20 ~1!, March 2005
Aparece en las colecciones: Doctorado

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