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合成了一个三乙四胺六乙酸双金属配合物 Ni_2Co(TTHA)·12H_2O(TTHA 为三乙四胺六乙酸),通过 X-射线衍射测得其晶体结构.该配合物属三斜晶系,Pī空间群,晶胞参数a=0.731 6(2)nm,b=0.862 4(2)nm,c=1.504 1(4)nm;a=73.38(2),β=83.97(2),γ=70.50(2)°.每个 Ni~(2+)与三乙四胺六乙酸的两个氮原子和三个羧酸根上的三个氧原子以及一个配位水分子配位构成八面体构型;另有一个 Co~(2+)与六个水配位,最后通过氢键将整个体系连接成为三维结构.该配合物的变温磁性测量表明螯合单元中 Ni(Ⅱ)间存在着很强的反铁磁相互作用,拟合结果 J_(Ni-Ni)=-141.64 cm~(-1),gNi=2.21,Co(Ⅱ)离子的自旋轨道偶合常数λ=-134.8 cm~(-1).
A triethylenetetramine hexaacetic acid bimetallic complex, Ni_2Co (TTHA) · 12H_2O (TTHA is triethylenetetramine hexaacetic acid) was synthesized and its crystal structure was determined by X-ray diffraction. The complex belongs to triclinic system, Pī space group, a = 0.731 6 (2) nm, b = 0.862 4 (2) nm, c = 1.504 1 (4) nm; a = 73.38 (2), β = 83.97 70.50 (2) °. Each Ni 2+ and the three nitrogen atoms of triethylenetetraamine hexaacetic acid and the three oxygen atoms of the three carboxylate ligands and a coordinating water molecule coordinate to form an octahedral configuration ; Another Co 2+ coordinated with six water and finally the three-dimensional structure was connected by hydrogen bond.The temperature-dependent magnetic measurements of the complex showed that the Ni (Ⅱ) (Ni-Ni) = -141.64 cm -1, gNi = 2.21, the spin-orbit coupling constant of the Co (Ⅱ) ion is -134.8 cm -1 ).