Synthesis and structure of the first bromide complex of the four-mercury anticrown [(o,o'-C6F4C6F4Hg)4Br]−

The first bromide complex of the tetramercury anticrown, [(o,o’-C6F4C6F4Hg)4Br]− (PyH)+, was synthesized by the reaction of alkenyl bromide complex of hafnocene Cp2Hf(Br)–C(But)=C(H)–C≡CBut with cyclic tetrameric perfluoro-o,o’-biphenylenemercury (o,o’-C6F4C6F4Hg)4. The structures of the obtained complex and initial alkenyl bromide complex were studied by the X-ray diffraction analysis.