Two- and three-dimensional aliphatic dicarboxylate copper coordination polymers with bis(3-pyridylmethyl)piperazine tethers

Divalent copper coordination polymers containing aliphatic dicarboxylate and bis(3-pyridylmethyl)piperazine (3-bpmp) tethering ligands exhibit different topologies depending on the length of the polymethylene chain and stoichiometric ratio. {[Cu(succinate)(3-bpmp)]center dot 8H(2)O) (1) and {[Cu(adipate)(3-bpmp)(H2O)]center dot 10H(2)O)(n) (4) both display (4,4) rhomboid grids, although the latter shows significant undulations to accommodate the additional girth of the dicarboxylate tethers. [Cu-2(succinate)(2) (3-bpmp)(0.5)(H2O)](n) (2) and [Cu-2(glutarate)(2)(3-bPmP)(n)], (3) possess {Cu-2(OCO)(3)) partial paddlewheel and {Cu-2(OCO)(4)} complete paddlewheel carboxylate bridged dimeric units, respectively. However, 2 has a (6,3) brick-layered structure with a rare binodal moganite (mog) supramolecular topology, while 3 possesses a non-interpenetrated primitive cubic network. Intriguing co-crystallized water tapes are seen in 1 and 4. Thermal dehydration and decomposition behavior of 1-4 is also presented. (C) 2010 Elsevier Ltd. All rights reserved.