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Original Articles

Supramolecular Bimetallic Systems Constructed through π‐π Stacking and Hydrogen Bond Interactions

, , &
Pages 757-764 | Received 24 Nov 2006, Accepted 18 May 2007, Published online: 29 Nov 2007
 

Five new bimetallic compounds have been synthesized and crystallographically characterized: [{Cu(acac)(phen)}2{Ni(CN)4}] · H2O (1), [{Cu(acac)(bipy)}2{Ni(CN)4}] (2); [Cu(acac)(bipy)(H2O)]2[Ni(CN)4] (3), [(Cu(acac)(Me2bipy)]2[Ni(mnt)2] (4), [Cu(acac)(bipy)][Ni(mnt)2] (5) (Me2bipy=4,4′‐dimethyl‐2,2′‐bipyridine; mnt=maleonitriledithiolate). The molecular structures of complexes 1 and 2 are similar: they consist of neutral [{Cu(acac)(BB)}2{Ni(CN)4}] entities, which result by connecting two [Cu(acac)(BB)]+ ions through two trans‐cyano groups from the bridging ligand, [Ni(CN)4]2− (BB=1,10‐phenanthroline and, respectively, 2,2′‐bipyridine). The intermolecular π‐π stacking interactions established between the organic ligands attached to the copper ions lead to supramolecular chains. In the ionic compound 3, the [Ni(CN)4]2− anions and the [Cu(acac)(bipy)(H2O)]+ cations generate a 3D supramolecular architecture by convolution of hydrogen bonding with π‐π stacking interactions. The crystal structure of compound 4, [(Cu(acac)(Me2bipy)]2[Ni(mnt)2], consists of cationic, [(Cu(acac)(Me2bipy)]+, and anionic species, [Ni(mnt)2]2−, which are connected through Cu ··· S interactions, resulting in supramolecular {CuNiCu} trimers. Crystal 5 is an ionic compound containing [Cu(acac)(bipy)]+ and [Ni(mnt)2] ions.

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