Circularly polarized emission studies on Tb3+ and Eu3+ complexes with potentially terdentate amino acids in aqueous solution

✍ Scribed by H.G. Brittain; F.S. Richardson

• Publisher: Elsevier Science
• Year: 1977
• Weight: 695 KB
• Volume: 7
• Category: Article
• ISSN: 0006-3061
• DOI: 10.1016/s0006-3061(00)80097-6

✦ Synopsis

Circularly polarized emission (CPE) and total emission (TE

) spectra are reported for Eu3+ and Tb3+ complexes of L-aspartic acid (L-asp), Lserine (L-sex), L-threonine (L-thr) and L-histidine (L-his) in DzO solution under various pH conditions. Variations in TE and CPE intensities and in CPE q~littings and r&n patterns as functions of solution pH are correlated with lan*mde ion/&and binding characteristics and with structural ChaIlgeS kl the coordination environment of the metal ion. In the Eu3*/amino acid systerns, the emission bands associated with the 5Dg -, .'Fl and 'F Eu3' transitions are monitored, and in the Th3+/amino acid systems the 3 D4 -7F5 Tbst emission is examined.