Correction to “Homochiral Ferromagnetic Coupling Dy2 Single-Molecule Magnets with Strong Magneto-Optical Faraday Effects at Room Temperature”

Abstract

Page 12045. Because of the bias in the understanding of the formula g_MCD = 2(ε₊(B) – ε₊(−B))/(ε₊(B) + ε₊(−B)), the g_MCD values in the original paper were calculated with g_MCD = 2{Δε(B+) – Δε(B–)}/{Δε(B+) + Δε(B–)} = {Δε(B+) – Δε(B–)}/Δε in Figure 7(top), i.e., g_MCD = 2Δε(MCD)/Δε(CD), which may reflect the degree to which the Faraday effect of chiral compounds varies with the direction of the magnetic field. This formula is different from the common g_MCD = Δε(MCD)/ε. The paragraph “The anisotropy factor of MCD, g_MCD = 2(ε₊(B) – ε₊(−B))/(ε₊(B) + ε₊(−B)),⁹² was calculated for both l-1 and d-1 (Figure 8), which have a roughly mirror symmetry in the 250–350 nm range. Notably, the values of g_max(MCD) for l-1 and d-1 at room temperature are 1.27 and −1.72 T^–1, respectively, whose absolute values are remarkably large values, much larger than those of 3d–4f complexes [Co₂Ln[(R)/(S)-L]₄]·Cl₅·2H₂O·MeOH·EtOH (Ln = Gd, Dy) (0.02 T^–1)⁴⁵ and 4f complexes (≤0.24 T^–1).⁹³ The large absolute value of g_max(MCD) for the chiral Dy₂ enantiomers d-1 and l-1 indicates a very strong magneto-optical Faraday effect. Recent studies have shown that, for lanthanide (III) compounds, the strength of MCD can be enhanced by increasing the magnetic dipole moment of the ground states and the excited states. ⁹³ The Dy(III) ion itself has a large magnetic moment (S = 7/2), and the ferromagnetic interaction between the two Dy(III) ions corresponds to large magnetic dipole moments of the ground state and the excited states; therefore, a strong magneto-optical Faraday effect for d-1 and l-1 appears as expected. This implies that they have potential application prospects in magneto-optical devices. By the way, because g_MChD and g_MCD are directly proportional,³⁷ it is possible for these chiral Dy₂ SMMs to have large g_MChD values.⁴⁵” should be corrected as follows: Replacing Δε(CD) in g_(CD) = Δε(CD)/ε with Δε(MCD) gives g_(MCD) = Δε(MCD)/ε,^92,93 i.e., g_(MCD) = {Δε(B+) – Δε(B−)}/(2ε); the g_(MCD) values of d-1 and l-1 are calculated to be −5.68 × 10^–5 and −5.53 × 10^–5 (after being normalized to 1.0 T) at 303 nm, respectively, the |g_(MCD)| values are small because their corresponding g_(CD) values are small too (2.79 × 10^–4 and –2.65 × 10^–4, respectively). For chiral molecular materials, the Δε(MCD)/Δε(CD) value means the increment percentage of the CD signal intensity in the presence of a magnetic field relative to the absence of a magnetic field. Therefore, such values at the CD signal peaks (in order to ensure that the measurement error is minimized) may reflect changes in the Faraday effect of chiral compounds.⁹⁴ The Δε(MCD)/Δε(CD) values at 1.6 T are −32.5% for d-1 and 33.6% for l-1 at 303 nm, suggesting that d-1 and l-1 have a strong magneto-optical Faraday effect. However, the |Δε(MCD)/Δε(CD)| values of d-1 and l-1 at 303 nm are smaller than those of R/S-[Mn₁₀Dy₆] (70% at 1.6 T) at 281 nm.⁹⁴ Figure 8 should be deleted accordingly. Page 12048. Reference 94: Wang, X.; Du, M.-H.; Xu, H.; Long, L.-S.; Kong, X.-J.; Zheng, L.-S. Inorg. Chem. 2021, 60, 5925. These corrections do not affect the overall findings and conclusions of the paper. We apologize for any confusion these errors may cause and appreciate the opportunity to correct them. We appreciate the understanding of the editors and readers. This article has not yet been cited by other publications.