Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity

0533908 - ÚOCHB 2021 RIV DE eng J - Journal Article
Wu, Tao - Li, G. - Kapitán, J. - Kessler, Jiří - Xu, Y. - Bouř, Petr
Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity.
Angewandte Chemie - International Edition. Roč. 59, č. 49 (2020), s. 21895-21898. ISSN 1433-7851. E-ISSN 1521-3773
R&D Projects: GA ČR(CZ) GA18-05770S; GA ČR(CZ) GA20-10144S; GA ČR(CZ) GJ19-05974Y; GA MŠMT(CZ) LTC17012; GA MŠMT(CZ) EF16_019/0000729
Institutional support: RVO:61388963
Keywords : chirality transfer * electronic circular dichroism * magnetic circular dichroism * polarized Raman scattering * resonance Raman optical activity
OECD category: Physical chemistry
Impact factor: 15.336, year: 2020
Method of publishing: Open access
https://doi.org/10.1002/anie.202011146

Previously, we and other laboratories have reported an unusual and strong Raman optical activity (ROA) induced in solvents by chiral dyes. Various theories of the phenomenon appeared, but they were not capable of explaining fully the observed ROA band signs and intensities. In this work, an analysis based both on the light scattering theory and dedicated experiments provides a more complete understanding. For example, double‐cell magnetic circular dichroism and magnetic ROA experiments with copper‐porphyrin complex show that the induced chirality is observed without any contact of the solvents with the complex. The results thus indicate that a combination of electronic circular dichroism (ECD) with the polarized Raman scattering is responsible for the effect. The degree of circularity of solvent vibrational bands is a principal molecular property participating in the event. The insight and the possibility to predict the chirality transfer promise future applications in spectroscopy, chemical analysis and polarized imaging.
Permanent Link: http://hdl.handle.net/11104/0312436