氯冉酸阴离子桥联的Nd(Ⅲ)-Nd(Ⅲ),Dy(Ⅲ)-Dy(Ⅲ)和Ho(Ⅲ)-Ho(Ⅲ)双核配合物的合成与磁性

Syntheses and Magnetic Properties of Binuclear Nd(Ⅲ)-Nd(Ⅲ), Dy(Ⅲ)-Dy(Ⅲ) and Ho(Ⅲ)-Ho(Ⅲ) Complexes with Dianion of Chloranilic Acid as Bridging Ligands

本文合成了三个以氯冉酸阴离子为桥基的稀土双核配合物,Ln_2(Phen)_4(CA)(NCS)_4(Ln=Nd,Dy,Ho;Phen=菲咯琳;CA=氯冉酸二价阴离子).通过元素分析,红外光谱,电导,电子吸收光谱及变温(4～300K)磁化率表征了配合物,并由变温磁化率观察到的数据和理论方程通过最小二乘法拟合,得出分子内稀土离子间的相互作用参数:Z’J’=-0.79(Nd),-0.67(Dy),-0.63cm^(-1)(Ho);表明稀土离子间存在极弱的反铁磁性交换相互作用 零场分裂参数△=-0.16(Nd),-0.76(Dy),-2.55cm^(-1)(HO);g=0.618(Nd),1.739(Dy),1601(HO),拟合因子≈10^(-4)

Three binuclear Nd(Ⅲ)-Nd(Ⅲ), Dy(Ⅲ)-Dy(Ⅲ) and Ho(Ⅲ)-Ho(Ⅲ) complexes containing the dianion of chloranilic acid (CA) as bridging ligand have been synthesized, namely Ln2(Phen)4(CA)(NCS)4(Ln = Nd, Dy, Ho; Phen=l, 10-phenanthroline; CA = dianion of chloranilic acid). They have been characterized by elemental analyses, IR and electronic spectra, conductance and variable-temperature magnetic susceptibility. The observed susceptibility data were fit to those from theoretical magnetic equation by least-squares method, giving the parameters: Z'J' = -0.79(Nd), -0.67(Dy), -0.63cm-1(Ho); It indicates the existence of very weak antlferromagnetic spin exchange interaction between the rare earth ions in the complexes.Δ= -0.16(Nd), -0.76(Dy), -2.55cm-1(Ho); g = 0.618(Nd), 1.739(Dy), 1.601(Ho); the agreement factor R≈10-4.