Fig. 5. Selected SMMs with the dipolar couplings (a–d) and the direct couplings (e and f). Arrows represent the relative orientations of local magnetic moments at the ground state. (a) A ferromagnetic dimer: the molecular structure (left) and the normalized magnetic hysteresis loops (right) at 0.035 T s−1 for a single crystal of [Dy2(ovph)2Cl2(MeOH)3]·MeCN. Adapted with permission from ref. 59; copyright: (2011) American Chemical Society. (b) An antiferromagnetic dimer: the molecular structure (left) and the normalized magnetic hysteresis loops (right) at 0.14 T s−1 for a single crystal of [Dy2(valdien)2(NO3)2]. Adapted with permission from ref. 60; copyright: (2011) American Chemical Society. (c) A frustration-type triangle: the molecular structure (left), relative orientations of the magnetic moments at the ground state (middle), and the magnetic hysteresis loops (right) at 0.02 T s−1 for the powder of [Dy3(μ3-CO3)(Clbbpen)3]+. Adapted with permission from ref. 63; copyright: (2020) Royal Society of Chemistry. (d) Single-Molecule Toroics: the molecular structure (left), orientations of the magnetic moments at the degenerate ground states (middle), and the normalized magnetic hysteresis loops (right) at 0.028 T s−1 for a single crystal of [Dy3(μ3-OH)2(o-vanillinato)3Cl(H2O)5]3+. Adapted with permission from ref. 68 and 69; copyright: (2006, 2008) Wiley-VCH. (e) A strongly coupled Ln–rad–Ln trimer: the molecular structure (left) and the magnetic hysteresis loops (right) at 0.9 mT s−1 for the powder of {[(Me3Si)2N]2(THF)Ln}2(μ-N2)−. Adapted with permission from ref. 73; copyright: (2011) American Chemical Society. (f) Not-so-strongly coupled Ln–rad–Ln trimers: the correlations between Ueff and the coupling constants for a series of [(Cp*2Ln)2(μ-R2bpym)]+ (left) and the magnetic hysteresis loops (right) for the powder of the (Ln = Dy, R = F) derivative. Adapted with permission from ref. 74; copyright: (2020) American Chemical Society.
