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

Nurul F Ghazali; Kuduva R Vignesh; Wasinee Phonsri; Keith S Murray; Peter C Junk; Glen B Deacon; David R Turner

doi:10.1039/d2dt02616c

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

Dalton Trans. 2022 Dec 13;51(48):18502-18513. doi: 10.1039/d2dt02616c.

Authors

Nurul F Ghazali^{1

2}, Kuduva R Vignesh³, Wasinee Phonsri¹, Keith S Murray¹, Peter C Junk⁴, Glen B Deacon¹, David R Turner¹

Affiliations

¹ School of Chemistry, Monash University, Clayton, VIC 3800, Australia. david.turner@monash.edu.
² Centre of Foundation Studies, Universiti Teknologi MARA, Cawangan Selangor, Kampus Dengkil, Dengkil 43800, Selangor, Malaysia.
³ Department of Chemical Sciences, IISER Mohali, Sector-81, SAS Nagar, Mohali-140306, Punjab, India.
⁴ College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia.

PMID: 36422236
DOI: 10.1039/d2dt02616c

Abstract

A series of mononuclear lanthanoidate complexes isolated as [Bu₄N][Ln(QCl₄)] 1Ln (QCl = 5-chloro-8-quinolinolate; Ln = Eu, Gd, Tb, Dy, Ho, and Er) have been prepared, characterised, and used as facile precursors to obtain a series of new heterobimetallic complexes as crystalline materials. Reaction of 1Ln with manganese nitrate forms [Ln₂Mn(QCl)₈] (2Ln, where Ln = Tb, Dy, Er and Yb) which have been structurally characterised in the cases of 2Tb and 2Yb. The heteroleptic trinuclear complex [Dy₃(QCl)₈Cl(OH₂)], 3, has also been obtained. Compounds 1Dy, 1Tb, and 1Er display slow relaxation of magnetisation below 10K, particularly for the prolate Er³⁺ ion. These results also suggest that the positive effects of the change from mononuclear to trinuclear lanthanoid complexes enhance their single molecule magnetic (SMM) behaviour, as evidenced by the well resolved frequency dependent AC out-of-phase susceptibility maxima seen in the 2Ln systems, that have been analysed quantitatively. The synthesis used here provides a promising strategy in obtaining heterobimetallic complexes with quinolinolate ligands and also constructing efficient heterobimetallic SMMs.