Structural and magnetic properties of copper(II) coordination polymers containing fluoride-based anions and ancillary organic ligands

The fluoride (F-) and bifluoride (HF2-) anions have been little used in the self-assembly of molecular and polymeric magnets. We have recently synthesized several new compounds, namely CuF2(3-OHpY)(4) (OHpy = hydroxypyridine) (1), Cu(SiF6)(2,6-me(2)pyz)(4) (me(2)pyz = dimethylpyrazine) (2), CuF2\(H2O)(2)(pyz) (pyz = pyrazine) (3) and [Cu(HF2)(pyz)(2)]BF4 (4). Compound I contains coordinate covalent and hydrogen bonding interactions that link the Cu(II) ions into 3D networks while 2 features square-pyramidal Cu(H) ions that are weakly bridged by SiF62- anions into ID chains. Preliminary structural data indicate that compound 3 contains ID Cu-pyz-Cu chains while 4 contains two dimensional [Cu(pyz)(2)](2+) layers, which held together via HF2- anions so as to form an unprecedented 3D network. The magnetic properties of each are briefly described herein.