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BaNi(S 2 C 2 O 2 ) 2  ·6 H 2 O crystallizes in the orthorombic system (space group  P 2 1 2 1 2 1 ). 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(S 2 C 2 O 2 ) 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 Ba 2+  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(S 2 C 2 O 2 ) 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.

zeitschrift für kristallographie - crystalline materials

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