Identification of Lanthanide(III) Luminophores in Magnetic Circularly Polarized Luminescence Using Raman Optical Activity Instrumentation

0475360 - ÚOCHB 2018 RIV US eng J - Journal Article
Wu, Tao - Kapitán, J. - Andrushchenko, Valery - Bouř, Petr
Identification of Lanthanide(III) Luminophores in Magnetic Circularly Polarized Luminescence Using Raman Optical Activity Instrumentation.
Analytical Chemistry. Roč. 89, č. 9 (2017), s. 5043-5049. ISSN 0003-2700. E-ISSN 1520-6882
R&D Projects: GA ČR(CZ) GJ16-08764Y; GA ČR GA15-09072S; GA ČR(CZ) GA16-05935S
Institutional support: RVO:61388963
Keywords : rare earth ions * photophysical properties * europium(III) complexes
OECD category: Physical chemistry
Impact factor: 6.042, year: 2017

Luminescence of lanthanide(III) ions sensitively reflects atomic environment. However, the signal may be weak and covered by Raman scattering. In the present study magnetic circularly polarized luminescence (MCPL) is explored as a more sensitive tool to recognize the lanthanide signal and assign underlying electronic transitions. MCPL spectra of the Na-3[Ln(DPA)(3)] (Ln = Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, and Er) complexes were recorded on a Raman optical activity (ROA) instrument. The ROA spectrometer equipped with the 532 nm laser excitation sensitively detects differences in scattering of left- and right-circularly polarized light caused by the magnetic field. Weak bands sometimes invisible in unpolarized measurement could be detected as MCPL. Observed transitions were assigned with the aid of the ligand-field theory. MCPL also reflects the environment: chloride and nitrate salts (LnCl(3) and Ln(NO3)(3)) provide a different signal than the complex, for Nd-III the signal responds to distribution of chloride and nitrate ions around the metal. The MCPL technique thus appears useful for identification and assignment of lanthanide transitions and increases the potential of fluorescent probes for applications in analytical chemistry and imaging.
Permanent Link: http://hdl.handle.net/11104/0272181