少量の水を含む有機溶媒中におけるランタンアセチルアセトナート二水和物の熱処理による二酢酸-水酸化ランタンの生成

抄録

Thermal treatment of lanthanum acethylacetonate dihydrate (LAA) in toluene in the presence of a small amount of water at 300°C was examined and the product was characterized by ¹³C-NMR, FT-IR, thermal analysis and scanning electron microscope (SEM). Only acetoxy group (CH₃COO-) was confirmed by the NMR measurement and hydroxyl group (-OH) was also observed in addition to the acetoxy group in the FT-IR spectrum, indicating the LAA was hydrolyzed and the acetylacetonate group was decomposed under the present condition. From the results of thermal analysis and elemental analysis, the product was determined to be lanthanum diacetate hydroxide (La (CH₃COO)₂(OH)). SEM observation revealed that the product consisted of thin plate while LAA was bulky mass, suggesting that the product was formed via a dissolution-recrystallization mechanism.