Synthesis, structure and magnetic properties of a pair of copper dicarboxylate/dipyridylamine coordination polymers with a non-interpenetrated CdSO4 topology

Hydrothermal synthesis has afforded a pair of divalent copper coordination polymers containing the kinked and hydrogen-bonding capable imine 4,4′-dipyridylamine (dpa) and aromatic dicarboxylates, {[Cu(iph)(dpa)]·0.5H2O}n (1, iph = isophthalate) and [Cu(tdc)(dpa)]n (2, tdc = 2,5-thiophenedicarboxylate). Compounds 1 and 2 contain orthogonally disposed parallel sets of 1-D [Cu(iph)]n and [Cu(tdc)]n chains, respectively, containing dicarboxylate-bridged dinuclear {CuOCO}2 units. The chain motifs are joined by tethering dpa ligands to construct uncommon non-interpenetrated 3-D CdSO4 lattices (658 topology) in both cases. Variable temperature magnetic studies show the presence of weak antiferromagnetic coupling within the {CuOCO}2 dimers in both complexes, with J = −2.66(3) and −1.68(5) cm−1 for 1 and 2, respectively.