Synthesis and crystal structure of the ferro-antiferro alternating chain containing μ-1,1,3-azido bridging ligands [(μ-1,1,3-N3)2{Cu2(Me2Eten)2(N3)2}]n.: Magnetic behavior

The compound [(mu-1,1,3-N-3)(2){Cu-2(Me(2)Eten)(2)(N-3)(2)}](n) (1) where Me(2)Eten is N,N-dimethyl-N'-ethylethylenediamine has been synthesized and characterized crystallographically. 1 crystallises in the monoclinic system, space group Pn (No. 7, standard group Pc) with F-w = 527.62, a = 9.951(2) Angstrom, b = 17.185(3) Angstrom, c = 6.866(2) Angstrom, beta = 94.62(2)degrees, V = 1170.3(5) Angstrom(3), Z = 2, R = 0.0447, R-w = 0.0976. Each copper atom is placed in a pseudooctahedral environment with a terminal azido and one diamine ligand. The remaining coordination sites are occupied by N atoms of the unusual mu-1,1,3 bridging azido ligands giving a ferro-antiferromagnetic alternating chain. Magnetic susceptibility data, measured from 2 to 300 K, show bulk ferromagnetic coupling. These data were fitted by using the equation for S = 1/2 ferromagnetic/antiferromagnetic systems, giving the parameters J(1) = -7.0 cm(-1), J(2) = 24.8 cm(-1), g = 2.08. (C) 1998 Elsevier Science Ltd. All rights reserved.