Application of Circularly Polarized Luminescence Spectroscopy to the Solution Structure of Racemic Polyaminocarboxylate Lanthanide (III) Complexes

Authors

Anna Mondry, Michigan Technological University
Stefan C.J. Meskers, Michigan Technological University
James P. Riehl, Michigan Technological University

Document Type

Article

Publication Date

8-1994

Department

Department of Chemistry

Abstract

Circularly polarized luminescence from 1:1 complexes of Eu(III) with triethylenetetra-aminehexaacetic acid (TTHA) following excitation with circularly polarized light is reported. This observation is consistent with a solution structure for this complex that is chiral, and stable on the emission time scale of Eu(III) (approximately 1.2ms). Additional measurements show only a slight dependence on temperature, and an estimate for the activation energy for racemization (23 kcal/mol) may be obtained. Attempts at detecting enantio-selective quenching of Tb(TTHA)^3- by optically active Ru(phen)²⁺₃ are also reported. Although significant quenching was observed, and the time-decay of the Tb(III) emission was not mono-exponential, no enantio-selectivity was found. This latter result may be interpreted in terms of the lack of discriminating short-range diastereomeric interactions between the chiral ion pairs.

Publisher's Statement

© 1994

Publication Title

Journal of Luminescence

Recommended Citation

Mondry, A., Meskers, S., & Riehl, J. (1994). Application of Circularly Polarized Luminescence Spectroscopy to the Solution Structure of Racemic Polyaminocarboxylate Lanthanide (III) Complexes. Journal of Luminescence, 62(1), 17-23. http://doi.org/10.1016/0022-2313(94)90071-X
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/5341