An unusual 3-D asymmetric mixed valence copper-azido complex with pyrazinecarboxylate as co-ligand showing rare net topology: Hydrothermal synthesis, structure and magnetic properties

Insight into non-covalent interactions in a [Cu(N3)4]2− bridged hetero-pentanuclear copper(ii)/sodium complex with special emphasis on the strong CH⋯π[Cu(N3)4] interactions

“…Azides may exhibit a wide range of bridging modes as μ 1,1 -N 3 (end-on, EO), 8–10 μ 2–1,1 -N 3 (double end-on, EO), 10 μ 1,3 -N 3 (end-to-end, EE), 10 μ 2–1,3 -N 3 (double end-to-end, EE), 10 μ 1,1,3 -N 3 , 8,10 μ 1,1,1 -N 3 , 8,10 μ 1,1,1,1 -N 3 , 8 μ 1,1,3,3 -N 3 8,10 and μ 1,1,1,3,3,3 -N 3 , 8 resulting in the formation of dinuclear, tetranuclear, cubane, 1D, 2D and 3D coordination complexes with diverse architectures and remarkable magnetic properties. 11–19 Some of the bridging modes have been effectively extended by the chemists while exploring the structures of the copper( ii ) azide systems. A 1D polymeric chain of the [Cu(N 3 ) 3 ] − anion was observed in the complex, [NMe 4 ] n [Cu(N 3 ) 3 ] n , where the copper( ii ) centres are connected by a couple of μ 1,3 and one μ 1,1 bridged azide ligands.…”