3D-supramolecular copper(I) cyanide coordination polymers through hydrogen bonding

The reactions of K-3[Cu(CN)(4)], 3-acetylpyridine (3-Acpy) or 4-acetylpyridine (4-Acpy) in the presence of Me3SnCl in H2O/acetonitrile media at room temperature afford the 3D-supramolecular coordination polymers (SCPs)(infinity)(3)[Cu2CN(mu-CN)center dot(3-Acpy)(2)] 1 and (3)(infinity)[Cu2CN(mu-CN)center dot(4-Acpy)(2)] 2. The structures of 1 and 2 consist of Cu2CN building blocks which are connected by CN groups, forming 1D-zig-zag chains. Each chain is bonded to another chain by hydrogen bonding into a 2D-layer. which is further stacked in an interwoven mode by pi-pi stacking interactions and hydrogen bonds in 1 and 2, as well as Cu center dot center dot center dot Cu interactions in 1, to create supramolecular 3D-network structures. The high dimensional topologies of 1 and 2 result mainly from extensive hydrogen bonding and pi-pi stacking. The long wavelength absorption band at 400-420 nm in the electronic spectra of 1 and 2 is assigned to a CT from copper(I) to the Acpy ligand. Compound 2 exhibits strong luminescence at 485 and 527 nm, corresponding to MLCT and metal-centered transitions, respectively. (C) 2009 Elsevier Ltd. All rights reserved.