Abstract
The crystal structures at 298°K of MnBr2·2H2O and CoBr2·2H2O have been refined by full‐matrix least‐squares methods using three‐dimensional MoKα intensity data. In these compounds, polymeric chains of metal and bromine atoms arranged in a near‐square planar arrangement with each bromine atom shared by two metal atoms parallel the c axis. The water molecules which fill the remaining octahedral positions about the metal atom provide hydrogen bonds to link adjacent chains.