Correlating axial and equatorial ligand field effects to the single-molecule magnet performances of a family of dysprosium bis-methanediide complexes

Abstract

Treatment of the new methanediide-methanide complex [Dy(SCS)(SCSH)(THF)] (1Dy, SCS = {C(PPh2S)2}2-) with alkali metal alkyls and auxillary ethers produces the bis-methanediide complexes [Dy(SCS)2][Dy(SCS)2(K(DME)2)2] (2Dy), [Dy(SCS)2][Na(DME)3] (3Dy) and [Dy(SCS)2][K(2,2,2-cryptand)] (4Dy). For...

Alkali Metal Based Triimidosulfite Cages as Versatile Precursors for Single‐Molecule Magnets

“…Under these conditions no maxima for the frequency dependency of χ” M did occur (see Supporting Information, Figure S31) Magnetization studies showed that compound 6 can retain its magnetization to a certain extent if the applied magnetic field is not entirely removed. Indeed, the presence of QTM at low temperatures prevents the observation of magnetic remanence at 0 dc field and results in a butterfly‐shaped hysteresis, [41] as shown in Figure 9 . The wings of the hysteresis are open at emperatures up to 7 K with a sweep rate of 185 Oe/s.…”

Emerging Trends on Designing High-Performance Dysprosium(III) Single-Molecule Magnets

“…In their subsequent work, the equatorial N-donors were replaced by softer S-donors giving a new structure [Dy(SCS) 2 ][K(2,2,2-cryptand)] (SCS = {C-(PPh 2 S) 2 } 2− ). 83 In comparison with the NCN analog, the latter exhibited an open hysteresis loop up to 15 K (field scanning rate of 14 Oe s −1 ) with ∼30% increment of the U eff (1109(70) K). The magnetic properties enhancement was due to the replacement of Dy−N by Dy−S bonds that create a more reduced equatorial CF.…”

“…The complex has potentially strong axial anisotropy through the CDyC motif and a weaker equatorial environment from four N-donors exhibiting U eff of 831 K and T B of 16 K at a field sweep rate of 3.5 mT s –1 (Figure c). In their subsequent work, the equatorial N-donors were replaced by softer S-donors giving a new structure [Dy­(SCS) 2 ]­[K­(2,2,2-cryptand)] (SCS = {C­(PPh 2 S) 2 } 2– ) . In comparison with the NCN analog, the latter exhibited an open hysteresis loop up to 15 K (field scanning rate of 14 Oe s –1 ) with ∼30% increment of the U eff (1109(70) K).…”

Zero‐field Slow Magnetic Relaxation Behavior of Dy2 in a Series of Dinuclear {Ln2} (Ln=Dy, Tb, Gd and Er) Complexes: A Combined Experimental and Theoretical Study

“…These elements can be regulated by the coordination sphere and/or bridging ligands which behave as superexchange pathways [23–28] . Recent studies in lanthanide chemistry show even a small change in ligand coordination can drastically modify the overall magnetism dynamics of the complexes [29–34] . Thus, designing and isolating dinuclear SMMs in a controlled manner, one can build larger motifs using a bottom‐up approach and construct SMMs with higher effective energy and blocking temperature.…”