Side-chain coordination polymers containing redox-active pendants: complexation of ferrocene-based bidentate ligands with M(hfac)2(hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate, M = Mn, Ni, Cu, Zn) and CuX (X = I, Br)

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Abstract
Coordination polymers with redox active pendants, {5-ferrocenylpyrimidine·M(hfac)2}n [M = Mn (1a), Ni (1b), Cu (1c), Zn (1d)] and {5-ferrocenylpyrimidine·CuX}n [X = I (2a), Br (2b)], have been prepared and characterized. In complex 1c, the Cu(II) ions are linked by the bridging ligands to form one-dimensional chains. This complex was shown to exhibit an antiferromagnetic intra-chain interaction, which was analyzed by the Bonner–Fisher model (2J/kB = −6.3 K). Complex 2a shows a two-dimensional sheet-like structure, in which one-dimensional chains, consisting of the Cu(I) ions and the ligands, are further bridged by iodide anions. These compounds show quasi-reversible redox processes of the ferrocenyl groups in the solid state.

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