间氟苯甲酸和联吡啶为共配体的{Dy_2Ni_2}四核簇的合成、结构和磁性能

A m-fluorobenzoate-based {Dy_2Ni_2} cluster incorporating dipyridyl coligand:Synthesis,structure and magnetism

通过水热法合成了一个间氟苯甲酸(FC_6H_5COO^-)和2,2′-联吡啶(bipy)为混合配体的异金属四核簇[Dy_2Ni_2(bipy)_2(FPhCOO)_(10)],并通过单晶和粉末X-线衍射、元素分析、红外光谱、热失重、直流和交流磁化率实验对其结构和磁性能进行了表征与测定.该配合物结晶于三斜的P1空间群,a=1.185 66(7)nm,b=1.385 61(8)nm,c=1.524 03(8)nm,α=106.052 0(10)°,β=99.936 0(10)°,γ=113.969 0(10)°,V=2.079 7(2)nm^3,Z=2.磁性能测试结果表明,配合物相邻自旋载体间存在着弱的反铁磁相互作用,并且具有场诱导的单分子磁体行为.通过阿累尼乌斯方程拟合得到磁化强度翻转的有效能垒(ΔE/k_B)为19.5K,指前因子(τ_o)为1.17×10^(-7)s.

A new m-fluorobenzoate （FCrHsCOO-）-based heterometallic teranuclear cluster with N, N-bidentate chelating coligand, [Dy2Ni2 （bipy）z （FC6H5PhCOO）m] （bipy = 2, 2＇-bipyridine ） was synthesized, and its structure and magnetism were characterized by single-crystal and powder X-ray diffraction, elemental analysis, FT-IR spectrum, TG stability and vari- abletemperature direct-/alternating current magnetic susceptibility. The complex crystallizes in the triclinic P1 space group with a= 1.18566（7）nm, b = 1.38561（8）nm, c = 1.52403（8）nm, α= 106.052 0（10）°,β = 99.9360（10）°, γ= 113.969 0（10）°, V = 2.079 7 （2） nm3, Z = 2. Adjacent spin carriers in the complex are weak antiferromagnetic, and the complex displays field-induced single-molecular magnet behavior. Fitting the dynamic magnetic data to the Arrhenius law gives energy barrier △E / ks = 19.5 K and pre-exponential factor τo = 1.17×10-7 s.