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Aqueous reaction of Cu(BF4)2, NH4HF2, and pyrazine leads to formation of a novel 3D framework, [Cu(HF2)(pyz)2]BF4 (1), where 2D [Cu(pyz)2]2+ square layers are connected via HF 2 - . A second compound, Cu(ReO4)2(H2O)2(pyz) (2), was the result of our attempt to create the perrhenate analog of 1; a linear chain compound consisting of CuO4N2 octahedra linked through pyrazine ligands formed instead. Both compounds exhibit extensive hydrogen bonding interactions where bifluoride, F⋯H⋯F−, and O–H⋯O link layers and chains together in 1 and 2, respectively. Broad maxima indicative of short-range magnetic ordering (SRO) were observed in the magnetic susceptibility at 5.5 (1) and 7.7 K (2) while no evidence for the transition to long-range magnetic ordering (LRO) was detected above 2 K. |
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