Abstract
AbstractFour heteronuclear CuII−HgII halides containing 2,2‐bipyridine (bipy) ligands have been synthesized and structurally characterised by single‐crystal X‐ray diffraction studies. The dinuclear complex [Cu(bipy)2HgCl2Br2] (1) contains a five‐coordinate copper(II) ion and a four‐coordinate HgII ion, in which the two different types of metal ions are bridged by a pair of chloride anions. [Cu2(bipy)4HgBr4][Hg2Br6] (2) contains a trinuclear [Cu2(bipy)4HgBr4]2+ cation in which the two copper(II) ions are bridged by an [HgBr4]2− tetrahedron via two Cu−Br bonds, and an edge‐sharing tetrahedral [Hg2Br6]2− anion. The structure of [Cu2(bipy)4Hg2Br6][Hg4Br10] (3) features a 1‐D chain along the diagonal of the a and c axes constructed from tetranuclear [Cu2(bipy)4Hg2Br6]2+ cations interconnected by [Hg4Br10]2− tetramers via elongated Hg−Br contacts (3.185 Å). Within the tetranuclear cationic unit, two [Cu(bipy)2]2+ units are bridged by an edge‐sharing dimeric tetrahedral [Hg2Br6]2− anion. In the trinuclear complex [Cu(bipy)2Hg2Cl6] (4), each [Hg2Cl6]2− dimer bridges with a [Cu(bipy)2]2+ ion to form a trinuclear [Cu(bipy)2Hg2Cl6] unit, and each pair of such units is bridged by a pair of elongated Hg−Cl bonds [3.043(5) Å] to form a dimeric unit. The magnetic properties of 1, 2, and 4 have also been investigated. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
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