The relationship between magneto-optical properties and molecular chirality
Source abstract
Abstract
The chiral nonanuclear Tb(III) clusters [Tb9(sal-(R)-Bt)16(μ-OH)10]+[NO3]− (Tb-(R)-Bt: sal-(R)-Bt=(R)-2-butyl salicylate) and [Tb9(sal-(S)-Bt)16(μ-OH)10]+[NO3]− (Tb-(S)-Bt: sal-(S)-Bt=(S)-2-butyl salicylate) were found to exhibit a unique magneto-optical property: the Faraday effect. The clusters were composed of 9 Tb(III) ions bridged by 10 μ-OHs and 16 chiral salicylic acid esters. The Faraday rotation angle of Tb-(R)-Bt was greater than that of Tb-(S)-Bt, indicating that the Faraday effect was affected by the chirality of the Tb(III) clusters. The chiroptical properties of the Tb(III) clusters were estimated using circular dichroism and circularly polarized luminescence. In this study, a new finding concerning chiral magneto-optical properties was investigated. By pairing chiral organic ligands with rare-earth clusters, scientists have gained surprising insights into magneto-optical material design. Many optical telecommunication devices use the Faraday effect — a means of rotating the polarization of light using magnetic fields — to prevent unwanted light transmissions. Now, Yasuchika Hasegawa from Hokkaido University in Japan and co-workers have observed the first-ever correlation between the Faraday effect and molecular chirality. The Faraday effect is traditionally viewed as being insensitive to natural optical activity such as chirality. But the team's previous investigations, which showed organic ligands influenced promising Faraday materials known as terbium glasses, inspired them to challenge long-held assumptions. They synthesized nine-membered terbium clusters and complexed them with chiral salicylate ligands. Different ligand chirality categorically affected the Faraday rotation angles — an effect that may arise from terbium's large transition magnetic dipole. Naturally occurring and magnetically induced optical activities (the Faraday effect) have contributed to our understanding of molecular electronic states, and have also had various applications in photonics. It has been generally considered that the Faraday effect is not affected by natural optical activity originating from chirality. Herein we describe for the first time a relationship between the Faraday rotation angles and chirality in a chiral lanthanide cluster. This finding provides new insights into the design of next-generation molecular Faraday materials and may lead to the development of a novel area of study within the field of chiral science.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Lanthanide and Transition Metal Complexes · Magnetism in coordination complexes · Quantum optics and atomic interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (38)
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