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Two phases of bis(tetraethylammonium) di-μ-chloro-bis[dichloropalladium(II)]

Acta Cryst. (2004). C60, m426–m430 [doi:10.1107/S0108270104016725]

[unit cell] A view of the unit cell at 292 K along the c axis. Displacement ellipsoids are drawn at the 50% probability level and H atoms are shown as small spheres of arbitrary radii.
The article describes two phases and a phase transition at ~153 K in the title compound [N(C2H5)4]2[Pd2Cl6]. This compound is chemically related to (NH4)2[PdCl4] and to [N(CH3)4]2[PdCl4] where phase transitions depending on temperature also occur and the structures of which were previously determined. The low-temperature phase of the title compound is twinned as a consequence of the phase transition (ImmmI2/m). The most interesting structural feature is the presence of C-H…Cl interactions as short as ~2.80 Å. Vibrational spectroscopy confi rmed that there are C-H…Cl hydrogen bonds in the structure.
J. Fábry, M. Dusek, K. Fejfarová, R. Krupková, P. Vanek and I. Nemec