A Raman optical activity spectrometer can sensitively detect lanthanide circularly polarized luminescence

Wu, Tao

doi:10.1039/d2cp01641a

Cited by 6 publications

(2 citation statements)

References 72 publications

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“…Measurement of CPL spectra on a commercial ROA spectrometer employing green laser excitation is very convenient for europium(III) compounds. [20,26] The metal exhibits sharp CPL lines (especially for the 5 D 0 → 7 F 1 transition) that fit into the instrumental spectral window. On the other hand, the genuine ROA signal cannot be measured due to the strong luminescence.…”

Section: Introductionmentioning

confidence: 95%

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

Wu,

Bouř,

Fujisawa

et al. 2023

Advanced Science

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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.

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Section: Introductionmentioning

confidence: 95%

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

Wu,

Bouř,

Fujisawa

et al. 2023

Advanced Science

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“…Most prominently, EuCl 3 yielded very different spectra (red traces) for each of the four studied monosaccharides. Other applications of the ROA‐CPL technique in biomolecular structural studies have been described in a recent review [12a] …”

Section: F Metal Coordination Compoundsmentioning

confidence: 99%

Molecular Properties of 3d and 4f Coordination Compounds Deciphered by Raman Optical Activity Spectroscopy

Wu,

Pelc,

Bouř

2023

ChemPlusChem

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Molecular properties of coordination compounds can be efficiently studied by vibrational spectroscopy. The scope of Raman spectroscopy has been greatly enhanced by the introduction of Raman optical activity (ROA) sensitive to chirality. The present review describes some of its recent applications to study the coordination compounds. 3d and 4f metal complexes often absorb the excitation light, or exhibit luminescence. Therefore, effects caused in ROA spectra by electronic circular dichroism (ECD) and circularly polarized luminescence (CPL) must be taken into consideration.In 3d metal complexes ECD and circularly‐polarized Raman scattering compete with the resonance ROA (RROA) signal. Pure RROA spectrum can thus be obtained by subtracting the so‐called ECD‐Raman component. CPL is frequently encountered in 4f systems. While it can mask the ROA spectra, it is useful to study molecular structure. These electronic effects can be reduced by using near‐infrared excitation although vibrational ROA signal is much weaker compared to the usual green laser excitation scenario. The ROA methodology is thus complex, but capable of providing unique information about the molecules of interests and their interaction with light.

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Sandwiched naphthyl carbazole: Inversion Circularly Polarized Luminescence based on a pull‐push electron valve strategy

Qi,

Junfeng,

Yueming

2024

Luminescence

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Inspired by circularly polarized luminescence (CPL), artificial CPL assembly has attracted intense attention. However, precise manipulation of chiral transfer from achiral and luminescent materials remains a formidable challenge. Two sandwiched carbazole and binaphthol derivatives composed of pyridine or trifluoride methyl benzene have been synthesized. Among R‐1 and R‐2, their spectra were found in the violet region, both in the solution and the film state. They exhibit the photoluminescence dissymmetry factors up to 1.4 × 10−3 for R‐2 and an opposite value of −5.6 × 10−4 for R‐1. Theoretical CPL and circular dichroism (CD) studies were in good agreement with the experimental data and deciphered their opposite signals by the transition electric and magnetic moment. Our study offers a strategy for studying the charge and chiral transfer.

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A Raman optical activity spectrometer can sensitively detect lanthanide circularly polarized luminescence

Abstract: Recently, many studies appreared where the Raman optical activity (ROA) instrument was found convenient also for measurement of circularly polarized luminescence (CPL). Typically, a weak lanthanide luminescence including the circular...

Cited by 6 publications

References 72 publications

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

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

Molecular Properties of 3d and 4f Coordination Compounds Deciphered by Raman Optical Activity Spectroscopy

Sandwiched naphthyl carbazole: Inversion Circularly Polarized Luminescence based on a pull‐push electron valve strategy

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