US EPA

6821297 

Journal Article 

Emission intensity of terbium(III) bound to benzene-carboxylic acid derivatives 

Brittain, HG 

1978 

Yes 

Journal of Luminescence
ISSN: 0022-2313 

17 

4 

411-417 

10.1016/0022-2313(78)90050-9 

WOS:A1978FX82400005 

http://www.sciencedirect.com/science/article/pii/0022231378900509
Exit
 

The emission intensity of Tb3+ bound to phenol, catechol, resorcinol, benzoic acid, pyridine, nicotonic acid, phthalic acid, salicylic acid, and picolinic acid has been studied. Relative intensities of Tb3+ emission indicate that formation of a chelate ring is necessary to observe enhancement of the emission relative to that of Tb3+ alone in aqueous solution. The pH dependence of Tb3+ emission when bound to phthalic, salicylic, and picolinic acids were examined in detail and evidence was found which indicated that the geometry of the Tb3+ ion undergoes several changes as the solution pH is raised. The emission intensities and pH dependences are also found to depend on the ratio of ligand to metal, and this observation support the presence of polynuclear lanthanide complexes existing in solution.