Synthesis and structure determination of [Cu(α-L)(N3)]NO3 and [Cu(α-L)(NCS)2] complexes with α-L=trans-5(R),7(R),12(S),14(S)-tetramethyl-6,13-dinitro-1,4,8,11-tetraazacyclotetradecane

The synthesis, structure, IR and UV–Vis spectra of [Cu(α-L)(N3)]NO3 (1), and [Cu(α-L)(NCS)2] (2) complexes are reported, where α-L=trans-5(R),7(R),12(S),14(S)-tetramethyl-6,13-dinitro-1,4,8,11-tetraazacyclotetradecane. The complex 1 crystallizes in monoclinic space group P21/c (no.14), with a=18.1269(1), b=9.6761(1), c=13.0378(1) Å, β=102.84(1)°, Z=4. A distorted square pyramidal (SP) geometry is found for the complex 1 and the apical position is occupied by the N3 − ligand. The basal displacement of Cu atom in 1 is 0.16 Å. The crystals of [Cu(α-L)(NCS)2] (2) are monoclinic, P21/n (no.14), with a=11.3912(1), b=8.8444(1), c=12.0482(1) Å, β=110.17(1)°, Z=2. The coordination environment for complex 2 is Cu(N4)(N2) having a tetragonally distorted octahedral geometry in which the axial positions are occupied by two (N-bonded) NCS− ligands (Cu–Nax=2.5051(15) Å).