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(Bu^t)=C(H)–C≡CBu^t 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.