Copper(II) coordination chain complex with the 2,5-bis(2-pyridyl)-1,3,4-thiadiazole ligand and an asymmetric μ 2 -1,1-azido double-bridged: Synthesis, crystal structure and magnetic properties

A new asymmetric μ2-1,1-azido double bridged cooper (II), with 2,5-bis(2-pyridyl)-1,3,4-thiadiazole (L), has been synthesized and characterized using single crystal X-ray diffraction, FT-IR, UV-Visible spectroscopic and magnetic measurements. The asymmetric unit of the title compound contains half molecule of formula, C 12 H 8 CuN 10 S, which crystallizes in the triclinic system, space group P1¯, with a = 6.5916 (4)A, b = 10.6905 (7) A, c = 11.5037 (7) A, α = 106.508 (3)°, β = 105.538 (3)°, γ = 90.233 (4)°, V = 745.99 (8) A3 and Z = 2. The structure consists of two [CuN5] prismatic polyhedra linked together by edge-sharing to build up a [Cu2N8] dimer arranged in chain. The connectivity along the chain is performed by [Formula presented] edge sharing between dimers. In the crystal, the molecules are linked together by [Formula presented] hydrogen bonds and by π—π interactions between parallel pyridyl rings of neighboring molecules. The interpretation of FT-IR and UV-Vis spectra is consistent with the crystal structure determined by X-ray diffraction. The magnetic properties of the complex confirm the picture of an alternated … Cu- J 1 -Cu …. J 2 … Cu- J 1 -Cu … magnetic chains. We found in the dimers weak antiferromagnetic exchange interactions J J 1 /k = −5.9 (1) k and between them J J 2 /k = −2.3 k.