Synthesis and structure determination of [Cu(alpha-L)(N-3)]NO3 and [Cu(alpha-L)(NCS)(2)] complexes with alpha-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(alpha -L)(N-3)]NO3 ( 1), and [Cu(alpha -L)(NCS)(2)] (2) complexes are reported, where alpha -L = trans-5(R),7(R),12(S),14(S)-tetramethyl-6,13-dinitro-1,4,8,11-tetraazacycl otetradecane. 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) Angstrom, beta = 102.84(1)degrees, Z = 4. A distorted square pyramidal (SP) geometry is fo und for the complex 1 and the apical position is occupied by the N-3(-) lig and. The basal displacement of Cu atom in 1 is 0.16 Angstrom. The crystals of [Cu(alpha -L)(NCS)(2)] (2) are monoclinic, P2(1)/n (no.14), with a = 11. 3912(1); b = 8.8444(1), c = 12.0482(1) alpha, beta = 110.17(1)degrees, Z = 2. The coordination environment for complex 2 is Cu(N-4)(N-2) having a tetr agonally distorted octahedral geometry in which the axial positions are occ upied by two (N-bonded) NCS- ligands (Cu-N-ax = 2.5051(15) Angstrom). (C) 2 001 Elsevier Science B.V. All rights reserved.