The reaction of copper nitrate and triethanolamine with benzene-1,4-dicarboxylic acid (bdcH) or 4,4'-[1,4-phenylenebis(oxy)]dibenzoic acid (podaH) leads to the formation of poly[bis(μ-benzene-1,4-dicarboxylato-κO:O:O:O)bis{μ-[bis(2-hydroxyethyl)amino]ethanolato-κN,O,O',O'':κO}tricopper(II)], [Cu(CHO)(CHNO)] or [Cu(μ-bdc)(teaH)] (I), and poly[bis{μ-4,4'-[1,4-phenylenebis(oxy)]dibenzoato-κO:O':O'':O''}bis{μ-[bis(2-hydroxyethyl)amino]ethanolato-κN,O,O',O'':κO}tricopper(II)], [Cu(CHO)(CHNO)] or [Cu(μ-poda)(teaH)], (II). The two representative compounds contain a well-established Cu cluster supporting a given 4 network. The ligand length is the underlying factor that controls the degree of interpenetration. Controlled interpenetration can be facile to realise by elongating protocols. Compound I shows a non-interpenetrating 4 network, whereas II features a threefold interpenetrating network. Furthermore, similar hydrogen-bond interactions extend the different interpenetrating 4 networks into three-dimensional supramolecular topologies. Variable-temperature magnetic studies showed a ferromagnetic coupling behaviour in the two complexes.
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