Preparation and characterization of two new CuII supramolecular coordination polymers incorporating sulfobenzoate and flexible heterocyclic ligands

Controlled interpenetration of 44 networks: syntheses and structures of two Cu3-cluster coordination polymers

The reaction of copper nitrate and triethanolamine with benzene-1,4-dicarboxylic acid (bdcH₂) or 4,4'-[1,4-phenylenebis(oxy)]dibenzoic acid (podaH₂) leads to the formation of poly[bis(μ₄-benzene-1,4-dicarboxylato-κ⁴O¹:O^1':O⁴:O⁴)bis{μ₂-[bis(2-hydroxyethyl)amino]ethanolato-κ⁴N,O,O',O'':κO}tricopper(II)], [Cu₃(C₈H₄O₄)₂(C₆H₁₄NO₃)₂] or [Cu₃(μ₄-bdc)₂(teaH₂)₂] (I), and poly[bis{μ₄-4,4'-[1,4-phenylenebis(oxy)]dibenzoato-κ⁴O:O':O'':O''}bis{μ₂-[bis(2-hydroxyethyl)amino]ethanolato-κ⁴N,O,O',O'':κO}tricopper(II)], [Cu₃(C₂₀H₁₂O₆)₂(C₆H₁₄NO₃)₂] or [Cu₃(μ₄-poda)₂(teaH₂)₂], (II). The two representative compounds contain a well-established Cu₃ cluster supporting a given 4⁴ 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 4⁴ network, whereas II features a threefold interpenetrating network. Furthermore, similar hydrogen-bond interactions extend the different interpenetrating 4⁴ networks into three-dimensional supramolecular topologies. Variable-temperature magnetic studies showed a ferromagnetic coupling behaviour in the two complexes.