Xie YS, Liu QL, Jiang H, Du CX, Xu XL, Yu MG, Zhu Y (2002) An unusual alternating ferro- and antiferromagnetic 1D hydrogen-bonded mu(2)-1,3-azide-bridged copper(II) complex: a dominant ferromagnetic coupling. New Journal of Chemistry 26(1), 176-179. [In English]

Web link: http://dx.doi.org/10.1039/b108511p

Keywords:

end-to-end, magnetic-properties, crystal-structure, chain compound, azido, ligands, perchlorate, bridges, dimers,

Abstract: A single-crystal structure analysis of [Cu-2(bben)(2) (N-3)(4)](n) (1) [bben = 1,2-bis(benzylamino) ethane] revealed that the complex consists of double asymmetric mu(2)-1,3-azide-bridged dimeric copper(II) moieties, each copper(II) coordinates with one bben, one terminal azido, and the two bridging azido ligands. The Cu-N-3-Cu torsion angle has a very large value of 47.5degrees. The dimeric units are assembled into 1D chains through N(bben) H...N (azido) hydrogen bonds. The intra- and the interdimeric Cu...Cu distances in the chain are 5.281( 2) and 3.662(2) Angstrom, respectively. Magnetic measurements on 1 have revealed the existence of a dominant ferromagnetic interaction with exchange coupling parameters of J(F) = 16.8 cm(-1), and J(AF) = 3.6 cm(-1), using an alternating ferro- and antiferromagnetic chain model for S = 1/2 local spins. The ferro- and antiferromagnetic interactions are ascribed to the mu(2)-1,3-azide bridges and the hydrogen bonds, respectively, he former interactions are rationalized by the large Cu-N-3-Cu torsion angles.