title: Ferromagnetic ordering in the layer-structured Pd(HS(2)O(7))(2).
abstract: The reaction of (NO2 )(CF3 SO3 ) and elemental palladium in oleum (65 % SO3 ) leads to violet single crystals of Pd(HS2 O7 )2 (monoclinic, P21 /c, Z=2, a=927.80(9), b=682.58(7), c=920.84(9) pm, β=117.756(2)°, wR2 =0.0439). In the crystal structure, the Pd(2+) ions show an uncommon octahedral coordination of six oxygen atoms belonging to six HS2 O7 (-) ions. The linkage of [PdO6 ] octahedra and the hydrogendisulfate anions leads to a layer structure, and the layers are held together by hydrogen bonds. The unusual coordination of the Pd(2+) ions results in an electronic d(8) high-spin configuration, which leads to the paramagnetic behavior of the compound. Moreover, at low temperature, a ferromagnetic ordering was observed with a Curie temperature of 8 K.
authors: Carl von Ossietzky Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky Strasse 9-11, 26129 Oldenburg (Germany), Fax: (+49) 441-798-3352.
authors: Jörn
authors: J
authors: Bruns
authors: Oliver
authors: O
authors: Niehaus
authors: Rainer
authors: R
authors: Pöttgen
authors: Mathias S
authors: MS
authors: Wickleder
keywords: hydrogen disulfate; magnetochemistry; palladium; structure elucidation