Copper(I) dicyanamide coordination polymers: ladders, sheets, layers, diamond-like networks and unusual interpenetration

The structures of six new derivatives of copper(I) dicyanamide (dicyanamide =N(CN)(2)(-), dca) have been determined. Those of Cu(dca)(MeCN) 1 and Cu(dc a)(Me(4)pyz)(1/2) 2, Me(4)pyz=tetramethylpyrazine, both contain (6,3) sheet s. Cu-2(dca)(2)(bipy)(MeCN)(2).0.5bipy 3, bipy=4,4'-bipyridine, consists of 1-D ladder-like polymers with intercalated bipy guests. Cu-4(dca)(4)(bipy) (3)(MeCN)(2) 4 is composed of 2-D layers which each interpenetrate with fou r others in a parallel fashion, resulting in a novel 3-D interlocking of la yers. alpha -Cu(dca)(bpe) 5, bpe=1,2-bis(4-pyridyl)ethene, consists of 2-D (4,4) sheets displaying twofold parallel interpenetration, while beta -Cu(d ca)(bpe) 6 contains five diamond-like networks which interpenetrate in an u nprecedented fashion.