Circularly polarized luminescence and enantiomeric energy transfer discrimination of chiral Tb(III)-Nd(III) EDDS and related complexes

Total luminescence (TL), circularly polarized luminescence (CPL), luminescence dissymmetry factor glum and lifetimes of optical active Tb(III)-L,D-EDDS complexes are measured in solution in order to investigate enantiomeric discrimination of energy transfer processes in the presence of quenchers: Nd(III)-L,D-EDDS or (+),(-)-[Co(en)3]I3 complexes. The spectroscopic differences for the chiral complex pairs are discussed in terms of the Stern-Volmer luminescence quenching mechanism. The quenching rate constants give evidence of the fact that a homochiral-pair is lower in energy in the excited states than a heterochiral-pair. The TL and CPL spectral patterns and fine structures in high resolutions are discussed at 10K of Tb(III)-L,D-EDDS and Tb(III)-(R),(S)-cyclene derivative complex nanocrystals in xerogel. The crystal field splitting and the structural anomaly are found in the axial CPL/TL spectra of trigonal dihedral Tb(ODA)3 single crystals in the temperature range between 300 and 10K. © 2004 Elsevier B.V. All rights reserved.