Crystal structures of three copper(II)-2,2'-bi-pyridine (bpy) compounds, [Cu(bpy)(HO)][SiF]·4HO, [Cu(bpy)(TaF)] and [Cu(bpy)][TaF] and a related coordination polymer, [Cu(bpy)(HO)SnF] .

We report the hydro-thermal syntheses and crystal structures of aqua-bis-(2,2'-bi-pyridine-κ ,')copper(II) hexa-fluorido-silicate tetra-hydrate, [Cu(bpy)(HO)][SiF]·4HO (bpy is 2,2'-bi-pyridine, CHN), (I), bis-(2,2'-bi-pyridine-3κ ,')-di-μ-fluorido-1:3κ :;2:3κ :-deca-fluorido-1κ ,2κ -ditantalum(V)copper(II), [Cu(bpy)(TaF)], (II), tris-(2,2'-bi-pyridine-κ ,')copper(II) bis[hexa-fluorido-tantalate(V)], [Cu(bpy)][TaF], (III), and -poly[[di-aqua-(2,2'-bi-pyridine-κ ,')copper(II)]-μ-fluorido-tetra-fluorido-tin-μ-fluorido], [Cu(bpy)(HO)SnF] , (IV). Compounds (I), (II) and (III) contain locally chiral copper coordination complexes with , , and symmetry, respectively. The extended structures of (I) and (IV) are consolidated by O-H⋯F and O-H⋯O hydrogen bonds. The structure of (III) was found to be a merohedral (racemic) twin.