Synthesis, crystal structure and magnetic properties of bimetallic complex of NiCo(TTHA)?12HO

Abstract

The bimetallic complex of Ni₂Co(TTHA)12H₂O (TTHA = triethylene tetraminehexaacetic acid) was synthesized and characterized structurally and magnetically. The title complex crystallizes in the triclinic space group P
+ with a = 0.7316(2), b = 0.8624(2), c = 1.5041(4) nm; ? = 73.38(2), ? = 83.97(2), ? = 70.50(2)°. The crystal structure is built up of [Ni₂(TTHA)(H₂O)₂]^2-, Co(H₂O)₆²⁺ and water molecules. The variable magnetic measurement shows that there is strong antiferromagnetic interaction between two Ni(II) ions in [Ni₂(TTHA)(H₂O)₂]^2- with J_Ni-Ni = -141.64 cm^-1, g_Ni = 2.21 and that the constant of spin-orbit coupling of Co(II) ion is -134.8 cm^-1.

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