Preparation of Some Lanthanoid Picrates and the Behavior of Their Water of Hydration
作者:Kazuharu Nakagawa、Kayoko Amita、Hifumi Mizuno、Yoshihisa Inoue、Tadao Hakushi
DOI:10.1246/bcsj.60.2037
日期:1987.6
Lanthanoid(III) picrates (Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, and Yb) were prepared from picric acid and the corresponding lanthanoid carbonates in good yields. Combustion analyses, ICP emission analyses, and UV spectrophotometry have shown that the light lanthanoid picrates, i.e. Ln=La–Gd, are all undecahydrates, while the heavy ones, Dy and Yb, are octahydrates. An examination by TG-DTA has revealed that these hydrates, being fairly stable in air at ambient temperature, are quite labile to give partially or completely dehydrated samples upon drying under vacuum, in a desiccator, and/or at elevated temperatures just above 30°C.
镧系元素(III)苦味酸盐(Ln=La、Ce、Pr、Nd、Sm、Eu、Gd、Dy和Yb)由苦味酸和相应的镧系元素碳酸盐制备而成,收率较高。燃烧分析、ICP发射分析和紫外分光光度法表明,轻镧系元素苦味酸盐(即Ln=La-Gd)均为十水合物,而重镧系元素(Dy和Yb)为八水合物。TG-DTA检查表明,这些水合物在环境温度下在空气中相当稳定,但在真空干燥器中干燥和/或在30°C以上的高温下,它们会变得不稳定,部分或完全脱水。