Synthesis, characterisation and magnetic study of a cyano-substituted dysprosium double decker single-molecule magnet

Abstract

Bis(octacyanophthalocyanine)dysprosium(III) (1) has been synthesised, characterised and magnetically studied. By the incorporation of cyano substituents on the phthalocyanine (Pc) rings, a starting point has been created for the chemical modification of double deckers for the purpose of surface self-assembly. The modification of the rings leaves the magnetic properties of the double decker largely unaffected.

Single-molecule magnetism of tetrapyrrole lanthanide compounds with sandwich multiple-decker structures

“…Peripheral substituents have significant but complicated effects on the SMM properties of tetrapyrrole lanthanide multiple-decker compounds (Scheme 3D). It is clear that electron-withdrawing substituents at the periphery of phthalocyanine ligands are helpful for suppressing the QTM effect, thereby enhancing the energy barrier for multikis(phthalocyaninato) lanthanide SMMs [45,46]. By contrast, the effects of electron-donating substituents on homoleptic bis(phthalocyaninato) lanthanide double-decker compounds remain unclear [45,[48][49][50]56].…”

Molecular single-ion magnets based on lanthanides and actinides: Design considerations and new advances in the context of quantum technologies

“…For example, peripheral ligand functionalisation with iodinated groups to form [Tb III (PcI4)2] did not significantly alter magnetic behaviour [107]. Equally, the introduction of cyano-groups onto [Dy , while altering the electronic structure, did not affect the Ueff [108]. In contrast, a systematic study on peripheral ligand functionalisation of homoleptic ([Tb(Pc)2]) and heteroleptic ([Tb(Pc)(Pc')] (Pc' = octa(tertbutylphenoxy)-substituted Pc ring) compounds with different peripheral patterns (i.e.…”

Decorated Tetrathiafulvalene‐Based Ligands: Powerful Chemical Tools for the Design of Single‐Molecule Magnets

“…As an example, hysteresis loops for 162 5@Y (orange line) and 163 5@Y (green line) are depicted on Figure b. Both displayed classical butterfly shaped hysteresis loop for mononuclear Dy(III) SMM, but 162 5@Y highlighted remnant magnetization while 163 5@Y did not (inset of Figure b). This study gave a clear indication that it is possible to drive the QTM through the hyperfine coupling for Ln(III) based mononuclear SMMs, since it was possible to isolate an unique chemical object displaying memory effect or not.…”