稀土Pr(Ⅲ)、Nd(Ⅲ)与2-[(取代苯胺基)羰基]苯甲酸的配合物研究

Studies on the Complexes of Pr(Ⅲ), Nd(Ⅲ) with 2-[(Substituted phenylamino) carbonyl]benzoic Acids

报道了配合物Ln(X-P)_3·3H_2O[其中X=H,2-Cl,4-Br,3-OH,3-NO_2,2-OCH_3,2-CH_3,2,4-二氯,P=2-(COO)C_6H_4CONHC_6H_(5-n)X_n,n=1,2;Ln=Pr(Ⅲ),Nd(Ⅲ)]的制备,并用元素分析、红外光谱、电子反射光谱、热重分析进行了表征。结果表明,配位是通过羧酸羟基氧原子和酰胺羰基氧原子进行的,含3分子配位水。通过电子反射光谱数据,对Slater-Condon参量(F_k)、Lande参量(ξ_(4f))、Nephelauxit比率(?),平均共价参数(?)、平均成键参数(?)、F_4/F_2、F_6/F_2比值进行了计算,对配合物的共价成键情况进行了讨论。

Complexes with the general formula Ln(X-P)3·3H2O[X = H, 2-Cl, 4-Br, 2CH3, 3-NO2, 2-OCH3, 2,4-dichloro, 3-OH; P = 2-(COO)C6H4CONHC6H5-nXn, n=1,2; Ln = Pr (Ⅲ), Nd(Ⅱ)] have been synthesized and characterized on the basis of elementry analysis, infrared and reflectance electronic spectra and thermogravimetical methods. The results show that the cpordination occurs by means of two oxygen atoms, one is from the amido and the other from the hydroxyl in the carboxylate. Each complex contains three coordination water molecules. The values of Slater-Condon (F2, F4, F6) interelectronic repulsion and Lande parameter (ξ4f) spin-orbit interaction parameters have been computed from the spectral data. The average values of F4/F2 and F6/F2 have been found to be 0. 137, 0. 0149[Pr (Ⅲ)] and 0.153, 0.0152 [Nd(Ⅲ)], respectively. By using the spectral data, the nephelauxitic ratio (β) , average covalency parameters (5) and average bonding parameters (b1/2) have been evaluated which indicate weak covalent bonding.