Spectroscopic study of Tb3+(beta-diketonate)3: alpha-cyclodextrin inclusion compounds in aqueous solution

Journal of the Brazilian Chemical Society

Anderson O. Ribeiro¹  Osvaldo A. Serra¹ 

[1] ,Universidade de São Paulo Faculdade de Filosofia Ciências e Letras de Ribeirão Preto Departamento de QuímicaRibeirão Preto SP ,Brazil

关键词: terbium(III);    beta-diketonate;    alpha-cyclodextrin;    inclusion compound;    luminescence;   

DOI  :  10.1590/S0103-50532007000200005

来源: SciELO

【 摘 要 】

In this work we describe how the inclusion of Tb3+ beta-diketonate chelates into the hydrophobic cavity of alpha-cyclodextrin enhances the solubility of the complexes in aqueous medium and leads to changes in their photophysical properties. To this end, the complexes [Tb(ppa)3(H2O)2] and [Tb(ppa)3(phen)] (ppa=3-phenyl-2,4-pentanedione; phen = phenantroline) were synthesized and characterized, and they were then included into alpha-cyclodextrin pockets. This inclusion was confirmed by ¹H NMR spectroscopy and the stoichiometry was determined by means of the Job method. In the excitation spectra, the maximum intensity wavelength of the inclusion compounds [Tb(ppa)3(H2O)2]: alpha-CD and [Tb(ppa)3(phen)]:alpha-CD were displaced 15 and 60 nm respectively when compared with the non-CD starting complexes. The typical Tb3+ emission bands were maintained after inclusion of the complexes into alpha-CD and their subsequent solubilization in aqueous medium.

【 授权许可】

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