TY - JOUR
T1 - Crystal structures of three anhydrous nitroprussides
T2 - M[Fe(CN) 5NO] (M=Mn,Zn,Cd)
AU - Rodríguez-Hernández, J.
AU - Reguera, E.
AU - Mir, M.
AU - Mascarenhas, Y. P.
PY - 2007
Y1 - 2007
N2 - The crystal structures of Mn, Zn, and Cd nitroprussides in their anhydrous state, M[Fe(CN) 5 NO] (M=Mn,Zn,Cd), were refined from XRD powder patterns using the Rietveld method. These compounds have a porous framework useful for adsorption and storage of small molecules. Water crystallization can be removed by heating below 100 °C without disrupting the 3D network by introducing certain structural modification mainly around the M site (Mn, Zn, Cd). For M=Mn and Cd, the compounds were found to be orthorhombic with space group Pnma [Mn:a=13.7844(1), b=7.3750(2), c=10.9470(2) Å, V=1112.8(1) Å3, Z=4; Cd:a=13.9566(3), b=7.5040(4), c=11.0230(2) Å, V=1154.4(1) Å3, Z=4]. Anhydrous zinc nitroprusside crystallizes in rhombohedral with space group R 3- [a=b=19.2525(1),c=17.7107(2) Å,γ=120.0°,V=5685.1(1) Å3, Z=18]. When exposed to humid air, these anhydrous compounds become hydrated. The XRD powder patterns were recorded under vacuum on samples dehydrated in situ. The structural information from XRD was complemented with thermo-gravimetric, infrared, and Mössbauer data.
AB - The crystal structures of Mn, Zn, and Cd nitroprussides in their anhydrous state, M[Fe(CN) 5 NO] (M=Mn,Zn,Cd), were refined from XRD powder patterns using the Rietveld method. These compounds have a porous framework useful for adsorption and storage of small molecules. Water crystallization can be removed by heating below 100 °C without disrupting the 3D network by introducing certain structural modification mainly around the M site (Mn, Zn, Cd). For M=Mn and Cd, the compounds were found to be orthorhombic with space group Pnma [Mn:a=13.7844(1), b=7.3750(2), c=10.9470(2) Å, V=1112.8(1) Å3, Z=4; Cd:a=13.9566(3), b=7.5040(4), c=11.0230(2) Å, V=1154.4(1) Å3, Z=4]. Anhydrous zinc nitroprusside crystallizes in rhombohedral with space group R 3- [a=b=19.2525(1),c=17.7107(2) Å,γ=120.0°,V=5685.1(1) Å3, Z=18]. When exposed to humid air, these anhydrous compounds become hydrated. The XRD powder patterns were recorded under vacuum on samples dehydrated in situ. The structural information from XRD was complemented with thermo-gravimetric, infrared, and Mössbauer data.
KW - Crystal structure
KW - Nitroprusside
KW - Porous material
KW - Prussian blue analogues
KW - Rietveld
UR - http://www.scopus.com/inward/record.url?scp=33847656550&partnerID=8YFLogxK
U2 - 10.1154/1.2434787
DO - 10.1154/1.2434787
M3 - Artículo
SN - 0885-7156
VL - 22
SP - 40
EP - 46
JO - Powder Diffraction
JF - Powder Diffraction
IS - 1
ER -