The crystal structures at 298°K of MnCl2·2H2O and FeCl2·2H2O have been refined by means of three-dimensional differential syntheses using diffractometer single-crystal x-ray-intensity data. The crystal structures of these isomorphic compounds consist of polymeric chains of metal and chlorine ions arranged in a near-square planar configuration with each chlorine ion shared by two metal ions. The water molecules which fill the remaining octahedral positions about the metal ion link adjacent chains, paralleling the c axis, by hydrogen bonds.
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Morosin et al. (1965) studied this question.
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