Superb Alkali-Resistant Dy^III₂Ni^II₄ Single-Molecule Magnet

Abstract

A superb alkali-resistant single-molecule-magnet (SMM) material with the molecular formula [Dy2Ni4(L)8(CH3COO)4(NO3)2] (1) (HL = 8-hydroxyquinoline) has been structurally and magnetically characterized. Single-crystal X-ray diffraction revealed that 1 possesses a hexanuclear [DyIII 2NiII 4] cluster, which is built by two triangular [DyIIINiII 2] cores double-bridged through two CH3COO– ions. Interestingly, 1 can keep its original structure in dilute acid and common basic solutions (e.g., triethylamine and NaOH). More importantly, 1 is still stable after treatment with a 20 M NaOH aqueous solution for 1 month at room temperature. Magnetic measurements uncovered that 1 is an SMM under zero applied field with U eff = 7.43 K. To the best of our knowledge, 1 is the first example of a 3d–4f SMM with such extreme alkali resistance. This work will broaden the vision of preparing SMM materials with excellent chemical stability.

Russian Doll-like 3d–4f Cluster Wheels with Slow Relaxation of Magnetization

“…However, the performances of these reported SMMs are still far from expected. Furthermore, there are a lot of other issues to be solved, such as the effective regulation and enhancement of magnetic coupling between 3d and 4f metal ions and the explanation of the relaxation mechanism [25][26][27][28]. Therefore, it is still of great significance to design and synthesize more 3d-4f SMMs with novel structures to improve SMM performances and to understand the magneto-structural correlation.…”

Efficient synthetic route to heterobimetallic trinuclear complexes [Ln–Mn–Ln] and their single molecule magnetic properties

“…11 Predictable formation of mixed 3d/4f SMMs is also desirable, in order to combine the properties of these ions. 12 The design of mixed d/f heterometallic complexes requires ligands that are able to accommodate ions with disparate coordination preferences and hence mixed N/O donor species are typically used.…”