Structural Investigation and Photoluminescent Properties of Gadolinium(III), Europium(III) and Terbium(III) 3-Mercaptopropionate Complexes

Author(s)

Souza, E. R. ^[1] ; Mazali, I. O. ^[1] ; Sigoli, F. A. ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Inst Chem, Lab Funct Mat, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: Journal of Fluorescence; v. 24, n. 1, p. 203-211, JAN 2014.
• Web of Science Citations: 7

Abstract

This work reports on the synthesis, crystallographic determination and spectroscopic characterization of gadolinium(III), terbium(III) and europium(III) 3-mercapto propionate complexes, aqua-tris(3-mercaptopropionate) lanthanide(III) - {[}Ln(mpa)(3)(H2O)]. The Judd-Ofelt intensity parameters were experimentally determined from emission spectrum of the {[}Eu(mpa)(3)(H2O)] complex and they were also calculated from crystallographic data. The complexes are coordination polymers, where the units of each complex are linked together by carboxylate groups leading to an unidimensional and parallel chains that by chemical interactions form a tridimensional framework. The emission spectrum profile of the {[}Eu(mpa)(3)(H2O)] complex is discussed based on point symmetry of the europium(III) ion, that explains the bands splitting observed in its emission spectrum. Photoluminescent analysis of the {[}Gd(mpa)(3)(H2O)] complex show no efficient ligand excitation but an intense charge transfer band. The excitation spectra of the {[}Eu(mpa)(3)(H2O)] and {[}Tb(mpa)(3)(H2O)] complexes do not show evidence of energy transfer from the ligand to the excited levels of these trivalent ions. Therefore the emission bands are originated only by direct f-f intraconfigurational excitation of the lantanide(III) ions. (AU)

• FAPESP's process: 09/54066-7 - Multi-User Laboratory for Advanced Optical Spectroscopy
• Grantee: Yoshitaka Gushikem
• Support Opportunities: Multi-user Equipment Program