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Rüdiger W. Seidel, Richard W. Goddard, Bodo Zibrowius, Iris M. Oppel

• Reaction of cadmium perchlorate and the prototypical linear bridging ligand 4,4'-bipyridine (4,4'-bipy) in an ethanol/water mixture affords the one-dimensional coordination polymer, \([{Cd(\mu-4,4'-bipy)(4,4'-bipy)_{2}(H_{2}O)_{2}}(ClO_{4})_{2}\) × 2 4,4'-bipy × 4.5 \(H_{2}O]_{n}\) \(\bf (1)\). The \(Cd^{2+}\) ions adopt an octahedral coordination sphere and are joined into linear chains by 4,4'-bipy \(\it via\) two \(\it trans\) coordination sites. The remaining two \(\it trans\) sites in the equatorial plane carry terminally monodentate-bound 4,4'-bipy ligands, resulting in a molecular antenna arrangement. The two axial sites of each \(Cd^{2+}\) ion are occupied by aqua ligands. Compound \(\bf 1\) crystallizes in the non-centrosymmetric, monoclinic space group \(\it C2\) with three similar, crystallographically independent, cationic coordination polymer strands in the unit cell, which essentially differ only in the conformations of the 4,4'-bipyridyl ligands. Consistent with the similarity of the local coordination environments of the three independent Cd atoms in the structure, \(^{113}Cd\) MAS NMR spectroscopy reveals a single resonance line at 89 ppm.