Tetrakis(phthalocyaninato) Rare‐Earth–Cadmium–Rare‐Earth Quadruple‐Decker Sandwich SMMs: Suppression of QTM by Long‐Distance f–f Interactions

Long-distance f-f interactions: Systematic and comparative studies of the magnetic properties of a series of isostructural sandwich-type tetrakis(phthalocyaninato) diterbium and monoterbium quadruple-decker complexes clearly reveal the suppression of the quantum tunneling of magnetization by the long-distance intramolecular f-f interactions (see figure).