Dinuclear and polynuclear Cu(II) azido-bridged compounds with 7-azaindole as a ligand. Synthesis, characterization and 3D structures

In this study three new dinuclear Cu(II) compounds with the ligand 7-azaindole (abbreviated as Haza) and bridging end-on azide anions with the general formula [Cu2(Haza)4(N3)2(A)2] (in which A=NO3- (1), CF3SO3- (2) and ClO4- (3)) are reported, as well as a dinuclear-based polymeric compound with the overall formula [Cu4(L)6(N3)6(ClO4)2]n·(CH3OH)2n (4). The latter compound contains both end-on and end-to-end azide anions. Full characterization of all four compounds has been performed by spectroscopic methods and by using 3D X-ray structure analysis.