Metal-Organic Framework Constructed by Copper(I) Cyanide and Ethyl Isonicotinate Through Hydrogen Bonding

The reaction of K-3[Cu(CN)(4)] and ethyl isonicotinate (EIN) in the presence of Me3SnCl in H2O/acetonitrile medium at room temperature affords the 3D-supramolecular coordination polymer (SCP), a (3)[CuCN center dot(EIN)], 1. The structure of 1 consists of 1D-zig-zag chains, which extend via the EIN ligands through hydrogen bonds organized in AB 2D-layers. The infinite AB center dot center dot center dot AB layers are further extended to form a 3D-network via hydrogen bonds and pi-pi stacking interactions, thus creating wide channels. The emission spectrum of 1 in the solid state reveals a set of high energy and low energy distinct peaks in the visible region at 400-580 nm upon excitation at 280 nm. The luminescence excitation in 1 could be caused by different possible transitions including metal-to-ligand charge transfer (MLCT) or single-metal-centered (MC) transitions.