This work describes the measurement and analysis of circular polarization in the luminescence (CPL), in the
near-IR spectral region, from chiral complexes of Yb(III) and Nd(III) in solution. The experimental technique
is based upon previous measurements of CPL in the visible region. Instrumentation design, performance, and
calibration are discussed. The experimental technique has been applied to several related complexes of Yb(III)
and Nd(III) with chiral macrocyclic ligands based on 1,4,7,10-tetraazacyclododecane that have approximate
C
4 symmetry. In addition, CPL from D
3 complexes of Yb(III) with 2,6-pyridinedicarboxylate, which were
prepared as a solution of enriched enantiomers by the addition of (+)-dimethyltartrate, is also presented. It
is demonstrated that CPL from the 2F5/2 → 2F7/2 transition of Yb(III) at 980 nm is particularly suited for CPL
studies because this transition satisfies magnetic-dipole selection rules. The luminescence from the 4F3/2 →
4I9/2 and 4F3/2 → 4I11/2 transitions of Nd(III) centered at 880 and 1060 nm, respectively, showed only weak
CPL signals. The usefulness of these types of polarization measurements in the near-IR is discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.