Topological diversity in copper aromatic meta-dicarboxylate coordination polymers with bis(pyridylformyl)piperazine coligands

Hydrothermal synthesis has afforded divalent copper coordination polymers containing bis(4-pyridylformyl) piperazine (4-bpfp) tethers and aromatic meta-dicarboxylate ligands. {[Cu(ip)(4-bpfp)]center dot 2H(2)O}(n) (1, ip = isophthalate) possesses a (4, 4) rectangular grid structure with an unusual ABCD stacking pattern along a 4(1) screw axis. Sterically bulky substituents in the 5-position of the isophthalate ligands reduced the coordination polymer dimensionality, with [Cu-2(tBuip)(2)(4-bpfp)(H2O)(2)](n) (2, tBuip = 5-tert-butylisophthalate) and {[Cu(MeOip)(HMeOip)(2)(4-bpfp)]center dot 3H(2)O}(n) (3, MeOip = 5-methoxyisophthalate) displaying 1D polymeric ladder and chain motifs, respectively. Compound 3 possesses a rare twofold interpenetrated binodal supramolecular hms net with (6(3))(6(9)8) topology. Longer meta-disposed acetate pendant arms induced a doubly interpenetrated 3D primitive cubic topology in {[Cu-2(1,3-phda)(2)(H2O)(2)(4-bpfp)]}(n) (4, 1,3-phda = 1,3-phenylenediacetate), which possesses antiferro-magnetically coupled {Cu2O2} kernels (J = -6.14(8) cm (1)). (C) 2010 Elsevier B.V. All rights reserved.