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希土—芳香异羟肟酸荧光固态配合物的合成及其性质的研究

SYNTHESIS AND CHARACTERIZATION OF FLUORESCENT SOLID COMPLEXES OF RARE EARTH AND AROMATIC HYDROXAMIC ACIDS

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【作者】 刘光华刘厚凡彭绍琴

【Author】 Liu Guanghua Liu Houfan Peng Shaoqin(Department of Chemistry, Jiangxi University, Nanchang 330047)

【机构】 江西大学化学系江西大学化学系 南昌330047南昌330047南昌330047

【摘要】 本文首次报道了十种三价希土(La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Tm和Y)离子与芳香异羟肟酸,即水杨酰异羟肟酸(SHA)、苯甲酰异羟肟酸(BHA)和邻苯二甲酰异羟肟酸(OPHA)配合物的合成方法和性质.元素分析、热重—差热分析测定和证实了这些新型希土配合物的组成.对这些配合物进行了红外光谱、核磁共振谱和荧光光谱的研究.实验证明,铕和铽的芳香异羟肟酸固态配合物有很好的荧光性质.对这些配合物在水和有机溶剂中的溶解性、稳定常数和摩尔电导也进行了研究.

【Abstract】 The complexes of rare earth and salicylhydroxamic acid (SHA) benzohydroxamic acid (BHA) and o-phthalichydroxamic acid (OPHA)were first prepared from aqueous alcohol solution at pH 3.5-5.0. Elemental and thermogravimetric analysis demonstrated that the formula are RE(SHA)3 · nH2O (where n = 2 for La, Ce, Pr, Nd and Tm, n = 3 for Sm, Eu, Gd and Tb, n = 4 for Y), RE(BHA)3 · mH2O (where m = 3 for La, Ce and Y, m = 4 for Pr, Nd, Sm and Eu, m= 5 for Gd, Tb and Tm)and RE2(OPHA)3 · xH2O)(whcre x = 4 for Ce and Y, x = 5 for La, Pr, Nd, Eu, Gd, Tb and Tm). The structure of some of the complexes crystals were confirmed by X-ray powder diffraction.These new complexes were insoluble in water, slightly soluble in mcthanol, chloroform, acetone, dimethyl sulfoxide and ethyl nitrite etc. but soluble in mineral acids. It was shown in data of thermogravimetric analysis that these complexes are stable thermally (most of them decomposed at a temperature higher than 300℃ ). The molecular conductance and stability constants of complexes have also been studied.The complexes were investigated by infrared,ultraviolet. HNMR and fluorescence spectra. Experimental results proved that these complexes of Tb with BHA, SHA and OPHA have a brilliant green emission in 485 and 490nm respectively, and complex of Eu with BHA, SHA and OPHA have two distinct red emission in 595-675nm.

【关键词】 希土芳香异羟肟酸配合物
【Key words】 rare eartharomatic hydroxamic acidcomplex
【基金】 国家自然科学基金资助项目
  • 【文献出处】 无机化学学报 ,Chinese Journal of Inorganic Chemistry , 编辑部邮箱 ,1993年04期
  • 【下载频次】58
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