Ligand mediated structural diversity of copper(II)-azido moiety: Synthesis, structure and magnetic study

Two copper azido complexes [Cu4(L1)4(mu 1,1-N3)3(N3)] (1) and [{Cu2(L2)(N-benzylen)(mu 1,1-N3)3(mu 1,1,3-N3(N3)]n (2) have been synthesized by the reaction of aqueous solution of sodium azide to a methanolic solution of copper perchlorate hexahydrate and corresponding Schiff-base ligands. Schiff bases HL1 and HL2 act as blocking coligands are derived from the 1:1 condensation of N-benzyl ethylenediamine with Salicyldehyde and 2-hydroxy-5chloroacetophenone respectively (N-benzylen is the N-benzyl ethylenediamine). These two complexes are characterized by the elemental analysis, FT-IR, single crystal X-ray diffraction, powder XRD and also TGA. Single crystal X-ray structural study reveals that complex 1 is the only single mu 1,1- azido bridged chain tetramer to the best of our knowledge and complex 2 is a mixed ligand azido bridged one dimensional chain which also represents the unique example containing three types of azido bonding modes mu 1,1-N3, mu 1,1,3-N3 and terminal N3 present simultaneously. Magnetic susceptibility measurements between 4.5 K and 300 K showed that complex 1 and complex 2 are antiferromagnetic and ferromagnetic in nature, respectively.

Automated summary

Two copper azido complexes with different azido bridged chain structures and magnetic properties have been synthesized and characterized in this study.