硝酸稀土与二水杨酸二甘醇二酯的配位研究

Studies on the Coordination of Rare Earth Nitrate with Diethylene Glycol Disalicylate

本文用硝酸稀土与水杨酸二甘醇二酯 (简写为 SE0 2或 L)在乙酸乙酯溶液中反应 ,合成了一系列新的固体配合物。以 L a、Gd、L u的配合物为代表 ,用元素分析确定其组成为 L n(NO3) 3C1 8H1 8O7· n H2 O(n=2或 3) ,用IR、UV光谱考察了配合物中稀土与配体间的配位情况 ,证明配体中的酚羟基氧、酯羰基氧和醚氧均参与了配位 ,其中以末端基的酚羟基氧和羰基氧的配位为主 ,与重稀土的配位强度明显高于轻、中稀土。配合物在空气、水及有机溶剂中稳定性好 ,加热时要到 30 0℃左右才发生放热分解反应 ,且重稀土的稳定性明显高于轻。

A series of novel solid complexes of rare earth nitrates with SEO 2 have been synthesized in ethyl acetate.The composition of these complexes is determined as Ln(NO 3) 3·C 18 H 18 O 7 ·nH 2O(n=2 or 3)by elemental analysis.The coordination between the ligand and rare earth was investigated by IR and UV spectra.The results show that the oxygen atoms of ligand are all coordinated to the rare earth ion.However,the oxygen atoms of phenol bydroxyl and carboxide are more important.The coordination strength between the heavier rare earth ion and the ligand is stronger than that of the lighter rare earth ions.Results of thermalanalysis also show that the complexes are decomposited over 300℃,and the heavier rare earth complexes have higher stability than the lighter rare earths have.