Three novel end-to-end single azido-bridged ferromagnetic copper(II) chains: Synthesis, crystal structure, and magnetic behavior

Partha Sarathi Mukherjee, Tapas Kumar Maji, Albert Escuer, Ramon Vicente, Joan Ribas, Georgina Rosair, Franz A. Mautner, Nirmalendu Ray Chaudhuri

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Abstract

Three new single end-to-end azido-bridged copper(II) chains [Cu(L1)(N3)]n(C1O4)n (1), [Cu(L2)(N3)]n(C1O4)n (2), and [Cu(L3)(N3)]n(C1O4)n (3) using three different tridentate Schiff bases L1, L2, and L3, obtained from condensation of pyridine-2-carbaldehyde with N,N-dimethylethane-1,2-diamine, N,N-diethylethane-1,2-diamine, and 4-(2-amino-ethyl)morpholine, respectively, have been synthesized, and their crystal structures have been determined by X-ray diffraction methods. Complex 1, C10H15CuN6C1O4, crystallizes in an orthorhombic system, space group P212121, with a = 7.434(3), b = 12.047(4), c = 17.404(6) Å, and Z = 4; complex 2, C12H19CuN6C1O4, crystallizes in an orthorhombic system, space group Pna21, with a = 14.723(5), b = 13.829(5), c = 8.002(5) A, and Z = 4 and complex 3, C12H17CuN6C1O5, crystallizes in an orthorhombic system, space group Pna21, with a = 13.837(15), b = 14.804(2), c = 8.050(4) Å, and Z = 4. Each structure consists of a single end-to-end azido-bridged copper(II) 1D chain where each copper(II) center possesses a square pyramidal geometry. Magnetic susceptibility data, measured from 4 to 300 K, show weak ferromagnetic interaction through the end-to-end bridging azido pathway in all the complexes. The magnetic data were fitted to a high temperature series-expansion for a one-dimensional system with S = 1/2 local spin based on the Hamiltonian H = - JSSi·Si+1 for all the complexes, giving the parameters J = +2.15 cm-1, g = 2.23 for 1, J = +3.61 cm-1, g = 2.16 for 2, and J = +2,06 cm-1, g = 2.17 for 3. This unusual magnetic behavior through the end-to-end bridging azido pathway has been correlated to the structural parameters.© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.

Original languageEnglish
Pages (from-to)943-949
Number of pages7
JournalEuropean Journal of Inorganic Chemistry
Issue number4
Publication statusPublished - 2002

Keywords

  • Azido bridge
  • Copper
  • Magnetic properties
  • N ligands

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    Mukherjee, P. S., Maji, T. K., Escuer, A., Vicente, R., Ribas, J., Rosair, G., Mautner, F. A., & Chaudhuri, N. R. (2002). Three novel end-to-end single azido-bridged ferromagnetic copper(II) chains: Synthesis, crystal structure, and magnetic behavior. European Journal of Inorganic Chemistry, (4), 943-949.