Synthesis, X-ray structure, spectroscopic and magnetic properties of [Cu(DACO)(m-1,1-N3)(m-1,3-N3)]n and [Cu(DACO)(m-NCS)(NCS)]n (DACOZ1,5-diazacyclooctane)

Two new one-dimensional copper(II) complexes bridged by azide and thiocyanate, [Cu(DACO)(m-1,1-N3)(m-1,3-N3)]n (1) and [Cu(DACO)(m-NCS)(NCS)]n (2), where DACOZ1,5-diazacyclooctane, have been synthesized and characterized. Single crystal X-ray diffraction analysis reveals that the bridging azido groups in complex 1 are coordinated alternately in the single end-to-end and single end-on models, giving an alternate chain, the unbridged N3 K groups acted as the terminal ligands. In complex 2, the strictly alternating copper ions and thiocyanates produce a chain in which the metallic centers are connected through single end-on-end NCSK groups. The central copper(II) ions in both complexes are penta-coordinated and situated in a distorted square-pyramid environment. Low temperature magnetic susceptibility indicates that complex 1 shows an antiferromagnetic behavior with the value for exchange coupling constant J isK4.06 cmK1, and gZ2.038; while the complex 2 exhibits a weak ferromagnetic interactions between the copper ions with JZ1.04 cmK1 and the corresponding gZ2.03. Moreover, the two complexes have also been characterized on the basis of elemental analysis, IR and UV–vis spectroscopy. q 2004 Elsevier B.V. All rights reserved