Zigzag stacking of Ni(S2C2O2)2 2- entities in the barium bis(dithiooxalato) nickelate(II). Structural relationships with 1—D alkali analogs and conductivity properties

Author:

Gleizes Alain,Maury Francis,Cassoux Patrick,Galy J.

Abstract

Abstract BaNi(S2C2O2)2 ·6 H2O crystallizes in the orthorombic system (space group P212121). The cell-constants are: a = 11.287(1)Å, b = 20.927(2) Å, c = 6.729(2) Å. The crystal structure has been determined using X-ray single crystal techniques and refined by full-matrix least-squares calculations to R = 0.034. It is of the one-dimensional type, consisting of flat Ni(S2C2O2)2 2- anions quite perpendicular to the direction of the c axis and stacked in a zigzag way along one of the twofold screw axis parallel to that direction, with the Ba2+ cations and water molecules filling the tunnels between the anionic columns. The anionic stacking differs from the “rooftile-like” type observed in the one-dimensional alkali derivatives of the anion Ni(S2C2O2)2 2- previously described. The room temperature powder electrical conductivity is 10-12 Ω -1 cm-1 for the barium salt, whereas it ranges from 10-9 to 10-6 Ω -1 cm-1, according to the cation, in the onedimensional alkali derivatives. These differences can be related to the different geometries of anionic stackings.

Publisher

Walter de Gruyter GmbH

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science

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