Acta Cryst. (2006). E62, i61-i63  [ doi:10.1107/S1600536806005113 ]

Praseodymium dodecaiodo-ferro-octahedro-hexapraseodymium, Pr₇I₁₂Fe

A. Palasyuk, I. Pantenburg and G. Meyer

Abstract: Heptapraseodymium iron dodecaiodide or praseodymium dodecaiodo-ferro-octahedro-hexapraseodymium, Pr₇I₁₂Fe (= Pr{Pr₆Fe}I₁₂), was obtained as black single crystals during investigations of the Pr-Fe-I system. It crystallizes with the Sc₇Cl₁₂N-type of structure. According to the formula Pr1{Pr2₆Fe}I1₆ⁱI2₆^i-a, it contains `isolated' {Pr2₆Fe} clusters, edge-capped by 12 I^- ligands, with Pr1 filling the otherwise empty octahedral holes between the I^- ions. Both Pr-Pr [3.9119 (8) and 3.9150 (8) Å] and Pr-Fe distances [2.7672 (5) Å] within the {Pr2₆Fe} cluster are in good agreement with those of similar compounds, as are the Pr-I distances. One of the Pr atoms and both I atoms occupy sites with symmetry 1 (Wyckhoff position 18f). The second Pr atom (3a) and the Fe atom (3b) are situated in sites with symmetry .

Online 22 February 2006

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