CRYSTAL-STRUCTURE OF MONOMETHYLAMMONIUM MONOCHLORODIBROMOMERCURATE(II)

The crystal structure of monomethylammonium monochlorodibromomercurate (II) was refined from single crystal X-ray data including the fractio nal contribution of centrosymmetric domains. The refinement converged to R = 0.05 in space group C2. The fraction of structure and its inver se were detected in the refinement. The structure is one-dimensional c onsisting of distorted tetrahedra (HgCl2Br2) connected together by chl orine atoms. The CH3NH3+ groups are connected to the chains by hydroge n bonds to the halogen atoms contributing to the cohesion of the cryst al.