Crystal structures of three copper(II)–2,2′-bi­pyridine (bpy) compounds, [Cu(bpy)2(H2O)][SiF6]·4H2O, [Cu(bpy)2(TaF6)2] and [Cu(bpy)3][TaF6]2 and a related coordination polymer, [Cu(bpy)(H2O)2SnF6]n

Acta Crystallographica Section E
Acta Crystallographica
Section E CRYSTALLOGRAPHIC COMMUNICATIONS

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Figure 7
Packing diagram for (III)

: yellow polyhedra represent Cu(bpy)₃²⁺ cations and green polyhedra represent TaF₆⁻ anions.

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