New Alternating Ferro- and Antiferromagnetic One-Dimensional Complexes. Synthesis, Characterization, Crystal Structure, and Magnetic Properties of [M(4,4‘-dimethylbipyridine)(N<sub>3</sub>)<sub>2</sub>]<i><sub>n</sub></i> [M = Cu(II), Mn(II), Ni(II), Fe(II)]
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The preparation, X-ray crystal structure, and magnetic properties of alternating 1,1- and 1,3-azido-bridged copper(II) complex [Cu(4,4‘-dmbpy)(N3)2]n (1, 4,4‘-dmbpy = 4,4‘-dimethylbipyridine) have been reported. It crystallizes in triclinic system, space group P1̄, a = 7.9903(1) Å, b = 9.3545(9) Å, c = 10.754(2) Å, α = 113.485(1)°, β = 101.399(1)°, γ = 101.897(1)°, Z = 2. The magnetic properties of 1 have been investigated in the temperature range 1.5−300 K. Alternating antiferromagnetic (−J = 191.0 cm-1) interaction through a 1,3-N3- bridge and ferromagnetic (J = 297.1 cm-1) interaction through a 1,1-N3- bridge are obtained for 1 by analyzing the magnetic susceptibility data with the Hamiltonian Ĥ = −J∑(Ŝ2iŜ2i-1 − αŜ2iŜ2i+1). It's derivatives ({Mn(4,4‘-dmbpy)(N3)2}n (2), {Ni(4,4‘-dmbpy)(N3)2}n (3), and {Fe(4,4‘-dmbpy)(N3)2}n (4) and the heterometallic derivatives {NiMn(4,4‘-dmbpy)2(N3)4}n (5) and {CuMn(4,4‘-dmbpy)2(N3)4}n (6) have also been synthesized and characterized by electronic and IR spectra. The X-ray powder diffraction and the magnetic properties of 6 have also been discussed.
