Cluster based copper(II)-azide polymer: Synthesis, structure and magnetic study

• DOI: 10.1016/j.poly.2010.09.012
• Publication Date: 2010-09-23T08:49:04Z
• Authors: Sandip Saha; Debabrata Biswas; Partha Pratim Cha...; Atish Dipankar Jana; Athanassios K. Bo...; Saikat Kumar Seth; Tanusree Kar
• Keywords: Ethylene diamine

The reaction of ethylene diamine with Cu(NO3)2� 3H2O and an excess of NaN3 (1:2:4 molar ratio) lead to the formation of copper-azido based polymer [Cu4(N3)8(en)2]n (1), which has been successfully characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction and variable temperature magnetic study. X-ray crystal structure determination of 1 reveals that the structure consists of 1D chains of a centrosymmetric tetranuclear copper(II)-azido cluster, connected through double azido end-to-end bridges. Variable-temperature magnetic studies (between 2 and 300 K) suggest dominant antiferromagnetic interactions in this complex, although ferromagnetic interactions have been observed in all other copper-azido based polymers produced with ethylene diamine reported so far.