A Molecular Playground for Spin-State Ice and Coupled Electron–Spin Dynamics

). Remarkably, the frustrated systems exhibit "spin-state-ice-like" behavior, with each triangular unit adopting either a two high-spin/one low-spin (2HS/1LS) or 1HS/2LS configuration, representing the first experimental observation of such behavior in molecular clusters. These findings establish a new paradigm for designing multistable magnetic materials with coupled electronic and spin transitions, offering insights into the interplay between elastic frustration and cooperative spin-state switching.