Synthesis and structure determination of [Cu(α-L)(N 3)]NO 3 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

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The synthesis, structure, IR and UV–Vis spectra of [Cu(α-L)(N 3)]NO 3 ( 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 P2 1/ 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 N 3 − ligand. The basal displacement of Cu atom in 1 is 0.16 Å. The crystals of [Cu(α-L)(NCS) 2] ( 2) are monoclinic, P2 1/ 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(N 4)(N 2) having a tetragonally distorted octahedral geometry in which the axial positions are occupied by two (N-bonded) NCS − ligands (Cu–N ax=2.5051(15) Å).