Poly[[aquacopper(I)-mu-bromo]-mu-(5-methylpyrazine-2-carboxylato)-kappa3N4:O,N1-[di-aquacopper(II)]-mu-(5-methylpyrazine-2-carboxylato)-kappa3O,N1:N4-[aquacopper(I)-mu-bromo]].
In the structure of the title compound, [Cu3Br2(C6H5N2O2)2(H2O)4], both copper(I) and copper(II) cations are present. The copper(II) cations are located on centres of inversion and are coordinated by two N atoms and two carboxylate O atoms from two symmetry-related 5-methylpyrazine-2-carboxylate anions, with two water molecules completing a distorted octahedron. The copper(I) cations are coordinated by the second N atom of the 5-methylpyrazine-2-carboxylate anion, one water molecule and two bromide anions within a distorted tetrahedron. Each of the bromide anions connects two symmetry-equivalent copper(I) cations to form zigzag-like CuBr chains. These chains are connected by the [diaquabis(5-methylpyrazine-2-carboxylato)]copper(II) complexes, forming corrugated sheets parallel to (100). The CuBr chains and the sheets are connected via O-H...O and O-H...Br hydrogen bonding.
Näther
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C
Institut für Anorganische Chemie, Christian-Albrechts-Universität Kiel, Olshausenstrasse 40, D-24098 Kiel, Germany. cnaether@ac.uni-kiel.de
Wriedt
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M
Jess
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I