Network diversity and supramolecular isomerism in copper(II)/1,2-bis(4-Pyridyl)ethane coordination polymers

Reactions of copper(II) sources with 1,2-bis(4-pyridyl)ethane (bpe) yielded metal organic networks with diverse topologies and dimensionalities. Compounds [Cu(bpe)(2)(dmf)(2)](n)(ClO4)(2n)center dot 2ndmf(1.2ndmf), [Cu(bpe)(2)(dmf)(2)](n)(ClO4)(2n)center dot 3.5ndmf (2.3.5ndmf), [Cu(bpe)(2)(NO3)(2)](n)center dot 2nH(2)O (4.2nH(2)O) and [Cu-2(bpe)(O2CMe)(4)](n)center dot 0.7nH(2)O (5.0.7nH(2)O) have been isolated by altering the copper(II) source, the reaction solvent and the crystallization process. Compounds 1.2ndmf and 2.3.5ndmf consist of cationic [Cu(bpe)(2)(dmf)(2)](2+) repeating units assembled to 1D and 20(4,4) networks, respectively, and represent supramolecular isomers due to the conformational isomerism of the bridging bpe molecules. Compound 4-2nH(2)O consists of neutral mononuclear [Cu(dpe)(2)(NO3)(2)] repeating units assembled to inclined interpenetrating (4,4) sheets describing an overall entanglement that is 3D in nature, and compound 5.0.7nH(2)O consists of neutral dinuclear repeating units assembled to cross-linked 1D chains. (C) 2011 Elsevier Ltd. All rights reserved.