μ－邻苯二甲酸希土与5－硝基－1，10－菲咯啉双核配合物的合成、光谱、磁性

SYNTHESIS, SPECTRA AND MAGNETISM OF P-PHTHALATO BINUCLEAR RARE EARTH COMPLEXES WITH 5-NITRO-1,10-PHENANTHROLINE

本文合成了四个以邻苯二甲酸阴离子为桥联配体的新型希土双核配合物［Ｌｎ２（Ｐｈｔｈ）（ＮＯ２－ｐｈｅｎ）４］（ＣｌＯ４）４·ｘＨ２Ｏ［Ｌｎ＝Ｇｄ、Ｔｂ、Ｈｏ、Ｅｒ，ＮＯ２－Ｐｈｅｎ＝５－硝基－１，１０－菲咯啉，Ｐｈｔｈ＝邻苯二甲酸阴离子）．经元素分析，ＩＲ、电导、电子吸收光谱，表征了配合物，测定了［Ｇｄ２（Ｐｈｔｈ）（ＮＯ２－ｐｈｅｎ）４］（ＣｌＯ４）４·４Ｈ２Ｏ的变温磁化率（４～３００Ｋ），其数值用最小二乘法与理论方程拟合，求得交换参数Ｊ＝－２．１８ｃｍ－１，表明Ｇｄ（Ⅲ）－Ｇｄ（Ⅲ）离子间存在较弱的反铁磁交换相互作用．

Four novel binuclear rare earth Ln(Ⅲ) complexes containing the dianion of phthalic acid as bridging ligand have been synthesized, namely [Ln2(Phth) (NO2-phen)4](ClO4)4·xH2O(Ln= Gd, Tb, Ho, Er, NO2-phen= 5-nitro-1,10-phenantroline, Phth=dianion of phthalic acid). They have been characterized by elemental analyses, IR, electronic spectra, ESR and conductances. Variable-temperature magnetic susceptibility (4￣300K) of complexes of [Gd2(Phth)(NO2-phen)4](ClO4)4·4H2O has been determined. A satisfactory fit to theoretical curve derived from spin Hamiltonian operator (H=-2JS1·S2) was obtained by least squares method. The exchange interaction parameters are J=-2.18cm-1, g= 2.81 and the agreement factor F= 8.0 x 10-3 indicating the existence of a weak antiferromagnetic spin exchange interaction between the rare earth ions in the complex.