In order to search for new anionic architectures and develop useful organic-inorganic hybrid materials in halometallate systems, two new crystalline organic-inorganic hybrid compounds have been prepared, i.e. catena-poly[triethyl(2-hydroxyethyl)azanium [[bromidocadmate(II)]-di-μ-bromido]], {(C8H20NO)[CdBr3]}n, (1), and catena-poly[triethyl(2-hydroxyethyl)azanium [[bromidomercurate(II)]-di-μ-bromido]], {(C8H20NO)[HgBr3]}n, (2), and the structures determined by X-ray diffraction analysis. The compounds are isostructural, crystallizing in the space group P21/n. The metal centres are five-coordinated by bromide anions, giving a slightly distorted trigonal-bipyramidal geometry. The crystal structures consist of one-dimensional edge-sharing chains of MBr5 trigonal bipyramids, between which triethylcholine counter-cations are intercalated. O-H···Br hydrogen-bonding interactions are present between the cations and anions.
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