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本文用复分解法合成了除钷以外的十五种稀土元素的Versatic-10盐,用化学分析,热分析和红外吸收光谱分析确定了盐的组成为Ln(C_9H_(19)COO)_3·nH_2O[Ln=La、Ce、Pr、Nd,n=1～3]或Ln(C_9H_(19)COO)_3[Ln为其它稀土元素]。证实复分解法与萃取法得到的相应Versatic-10盐为同一化合物,据此证实皂化的Versatic-10萃取Ln(Ⅲ)具有阳离子交换机理。用气相渗透法(VPO)确定了上述盐在正己烷中的表观数均分子量,从而确定稀土Versatic-10盐在一定浓度的正己烷溶液中有二聚倾向,稀释时能解聚。红外分析表明,上述盐中各稀土元素与羧基氧结合的Ln-O键的强度相近,主要具有离子键的特征,但也含有共价成分;这些盐可能具有离子型或多聚整合配位的结构;△v=v反对称(coo~-)~(-v)对称(coc~-)值与镧系元素的原子序数的关系呈规律性的变化,表明镧系元素4f电子对Ln-O成键的影响,
In this paper, fifteen rare earth elements Versatic-10 salts were synthesized by the double decomposition method. The chemical composition, the thermal analysis and the infrared absorption spectrum were used to determine the composition of the salt as Ln (C_9H_ (19) COO) 3 · nH_2O [ Ln = La, Ce, Pr, Nd, n = 1 ~ 3] or Ln (C_9H_ (19) COO) _3 [Ln is other rare earth elements]. It was confirmed that the corresponding compound Versatic-10 salt obtained by the metathesis method and the extraction method is the same compound, and thus it was confirmed that the saponified Versatic-10 extraction Ln (III) has a cation exchange mechanism. The apparent number average molecular weight of the above salt in n-hexane was determined by gas-phase permeation (VPO) to confirm that the Versatic-10 salt of the rare earth had a tendency of dimerization in a certain concentration of n-hexane solution and depolymerization upon dilution. Infrared analysis shows that the Ln-O bonds of the rare earth elements and the carboxyl oxygen in the above salt are similar in intensity and mainly have ionic bond but also contain covalent components. These salts may have ionic or polymeric coordination coordination Structure. The relationship between △ v = v symmetry (coo ~ -) ~ (-v) symmetry (coc ~) and the atomic number of lanthanides showed a regular change, indicating that Ln-O The key to the impact,