Role of structural dimensionality in the magneto-chiral dichroism of chiral molecular ferrimagnets
Here we report on magneto-chiral dichroism (MChD) detected with visible light on the chiral molecular ferrimagnet [{Cr III (CN) 6 }(Mn II NH 2 ala) 3 ]·3H 2 O (X = S, R; NH 2 ala = 2-aminoalanine). Single crystals suitable for magneto-chiral optical measurements were grown starting from enantiopure...
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Published in | Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 1; no. 37; pp. 13939 - 13945 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
29.09.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Here we report on magneto-chiral dichroism (MChD) detected with visible light on the chiral molecular ferrimagnet [{Cr
III
(CN)
6
}(Mn
II
NH
2
ala)
3
]·3H
2
O (X = S, R; NH
2
ala = 2-aminoalanine). Single crystals suitable for magneto-chiral optical measurements were grown starting from enantiopure precursors. X-ray diffraction and magnetic measurements confirmed the 3D-helical structure of the material, its absolute configuration, and its ferrimagnetic ordering below 35 K. Absorption and MChD spectra were measured between 520 and 900 nm from room temperature down to 4 K. At 4 K the electronic spectrum features spin-allowed and spin-forbidden transitions of Cr
III
centers and metal-to-metal charge transfer bands. The MChD spectra below the magnetic ordering temperature exhibit absolute configuration-dependent MChD signals, whose shape and intensity closely resamble that of a recently investigated 2D-layered chiral ferrimagnet featuring the same building blocks but different chiral ligands and a lower structural dimensionality. By comparing the temperature and magnetic field dependence of the MChD signals in these two chiral molecular ferrimagnets, we unravel the effect of structural dimensionality in MChD and provide chemical design criteria towards highly responsive magneto-chiral optical materials.
The optical and magneto-chiral optical properties of a 3D chiral molecular ferrimagnet based on Cr
III
and Mn
II
building blocks have been investigated to unveil the role of structural dimensionality on magneto-chiral dichroism. |
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Bibliography: | https://doi.org/10.1039/d2tc01777f Electronic supplementary information (ESI) available: Additional figures. See DOI Matteo Atzori is a CNRS researcher at the Laboratoire National des Champs Magnétiques Intenses (LNCMI - CNRS, Grenoble - France). During the PhD (University of Cagliari, Italy - University of Angers, France), he worked on chiral functional molecular materials showing magnetism and electrical conductivity. Then he worked on the quantum coherence properties of vanadium complexes at the University of Florence (Italy). Currently, he is investigating Magneto-Chiral Dichroism in chiral molecules and materials. Matteo won several awards, including the silver medal of the European Young Chemists' Award 2018 of EuChemS, and has co-authored more than 40 publications and a book, Functional Molecular Materials. |
ISSN: | 2050-7526 2050-7534 |
DOI: | 10.1039/d2tc01777f |