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A new CuII-azide complex has been synthesized by the reaction of piperazine, Cu(OAc)2·2H2O (OAc is acetate) and NaN3. In the structure, [mu]2-1,1- and [mu]3-1,1,1-azide anions bridge five CuII cations to form a linear penta­nuclear cluster unit, which is further linked by [mu]2-1,1- and [mu]2-1,3-azide anions to form a two-dimensional condensed [Cu5(N3)12]n layer.

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The four Co atoms of a novel tetra­nuclear mixed-valence cobalt complex display distorted octa­hedral coordination environments and are bridged by two 2-[(oxido­imino)­methyl]-6-meth­oxy­phenolate ligands, two 2-[(hy­droxy­imino)­methyl]-6-meth­oxy­phenolate ligands and two azide anions to form a tetra­nuclear [Co4N4O4] cluster. Adjacent clusters are connected through weak C-H...N and C-H...O inter­actions.
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