Exploring magneto-chiral dichroism in heterometallic 3d–4f complexes: recent advances and future prospects

Abstract

In coordination chemistry research, magneto-chiral dichroism (MChD) is a unique phenomenon that occurs via the interaction of light with a magnetized chiral system. Among the various sophisticated spectroscopic techniques, MChD has become a cornerstone for probing electronic transitions in magneto-optical materials. Nevertheless, achieving strong magneto-optical responses remains a significant challenge, both experimentally, in terms of measurable signal intensity, and theoretically, in terms of accurately modelling and predicting MChD from complex electronic structures. The growing research interest in MChD stems from its dual significance: it not only offers insights into the magnetic, electronic, and chiroptical properties of molecular systems but also holds promise for technological applications such as the development of standalone optical readout mechanisms for magnetic information. The chiral heterometallic 3d–4f systems are particularly promising candidates for MChD research. Intrinsic features such as strong spin–orbit coupling, unique electronic configurations, diverse optical transitions, flexible coordination environments, and pronounced magnetic anisotropy create a molecular platform for advancing the understanding and exploration of this fascinating phenomenon. This perspective primarily highlights the current state of MChD properties in a wide range of 3d–4f coordination complexes, distilling key findings that can guide the rational design of systems with enhanced MChD effects. This article concludes by proposing experimental strategies and research directions aimed at deepening our understanding of MChD and advancing its practical applications.