Molecular Vibrations in Chiral Europium Complexes Revealed by Near-Infrared Raman Optical Activity

0580544 - ÚOCHB 2025 RIV US eng J - Journal Article
Wu, Tao - Bouř, Petr - Fujisawa, T. - Unno, M.
Molecular Vibrations in Chiral Europium Complexes Revealed by Near-Infrared Raman Optical Activity.
Advanced Science. Roč. 11, č. 1 (2024), č. článku 2305521. E-ISSN 2198-3844
R&D Projects: GA ČR(CZ) GA23-05378S; GA ČR(CZ) GA22-04669S; GA MŠMT(CZ) EF18_053/0016940
Research Infrastructure: e-INFRA CZ - 90140
Institutional support: RVO:61388963
Keywords : chiral lanthanide complexes * circularly polarized luminescence * density functional theory * raman optical activity * spectra simulations
Impact factor: 15.1, year: 2022
Method of publishing: Open access
https://doi.org/10.1002/advs.202305521

Raman optical activity (ROA) is commonly measured with green light (532 nm) excitation. At this wavelength, however, Raman scattering of europium complexes is masked by circularly polarized luminescence (CPL). This can be avoided using near-infrared (near-IR, 785 nm) laser excitation, as demonstrated here by Raman and ROA spectra of three chiral europium complexes derived from camphor. Since luminescence is strongly suppressed, many vibrational bands can be detected. They carry a wealth of structural information about the ligand and the metal core, and can be interpreted based on density functional theory (DFT) simulations of the spectra. For example, jointly with ROA experimental data, the simulations make it possible to determine absolute configuration of chiral lanthanide compounds in solution.
Permanent Link: https://hdl.handle.net/11104/0349302