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metal-organic compounds
The structures of [Cu(C12H8N2)2(S4O6)], (I) and [Cu(C12H8N2)3](S4O6).5H2O, (II), are reported. Compound (I) consists of infinite polymeric chains where copper displays a typical (4 + 2) coordination and S4O6 connects Cu(phen)2 (phen = phenanthroline) units through rather long Cu—O contacts. Compound (II), instead, has a purely ionic character displaying [Cu(phen)3]2+ and S4O62− monomeric units. Equatorial and apical bonds in the copper coordination spheres have mean values of 2.003 (5)/2.467 (12) Å and 2.056 (3)/2.311 (13) Å for (I) and (II), respectively. Some short OOW contacts in (II) suggest the existence of hydrogen bonding involving some of the water molecules of hydration.