Design and construction of copper(I) complexes based on flexi-dentate cyclic N2-donor Schiff bases via in situ reduction of copper(II) precursors

Three copper(I) complexes [Cu(µ2-L1)I]n (1), [CuL1(µ-1,1,3-SeCN)]n (2) and [Cu2(µ2-I)2(L2)2] (3), where L1 = 5,6-diphenyl-2,3-dihydropyrazine and L2 = 2,3-dihydro-5,6-bis(4-methoxyphenyl)pyrazine, have been synthesized via in situ reduction of copper(II) precursors under ambient conditions and they have been characterized by elemental analysis, IR and UV–Vis spectroscopy and single-crystal X-ray diffraction studies. The copper(I) centres have trigonal planar geometries in complexes 1 and 3, whereas it is tetrahedral in complex 2. Complex 1 has a 1-D chain structure, complex 2 features a ladder-like polymeric coordination network with Cu2Se2 core, complex 3 features a double iodide bridge dimer. Complex 1 crystallizes in monoclinic space group P21/c whereas complexes 2 and 3 crystallize in triclinic space group P1−1. Complexes 1 and 2 show significant C-H···π interactions, but complex 3 has no such C–H⋯π interactions.

Three novel copper(I) coordination complexes have been synthesized via in situ reduction of copper(II) precursors under ambient conditions and they have been characterized by elemental analysis, IR and UV–Vis spectroscopy and single-crystal X-ray diffraction studies.Figure optionsDownload as PowerPoint slide