Issue 39, 2021

3d–4f magnetic exchange interactions and anisotropy in a series of heterobimetallic vanadium(iv)–lanthanide(iii) Schiff base complexes

Abstract

A series of heterobimetallic LnIII–VIV compounds [Ln(VO)L(NO3)3(H2O)] (Ln = Gd(1), Tb(2), Dy(3), and Er(4)) assembled by a Schiff base ligand (H2L = N,N′-bis(1-hydroxy-2-benzylidene-6-methoxy)-1,7-diamino-4-azaheptane) were prepared and studied with experimental and theoretical methods. The single-crystal X-ray analysis revealed the change of the coordination number from 10 found in 1–3 to 9 confirmed in 4. The DC magnetic data were fit with several Hamiltonians to extract the exchange and anisotropy parameters of complexes 1–4. This investigation of magnetic properties was carried out using both DFT and CASSCF theoretical calculations. It was found out that exchange interactions in 1, 3 and 4 are antiferromagnetic, while 2 has ferromagnetic exchange interactions. Moreover, the AC susceptibility measurements revealed the field-induced slow relaxation of magnetization in complexes 2 and 3 which is complicated by the presence of three relaxation channels. Nevertheless, these compounds belong to the first TbIII–VIV and DyIII–VIV single-molecule magnets in this class of compounds.

Graphical abstract: 3d–4f magnetic exchange interactions and anisotropy in a series of heterobimetallic vanadium(iv)–lanthanide(iii) Schiff base complexes

Supplementary files

Article information

Article type
Paper
Submitted
14 jun 2021
Accepted
23 aug 2021
First published
23 aug 2021

Dalton Trans., 2021,50, 13883-13893

3d–4f magnetic exchange interactions and anisotropy in a series of heterobimetallic vanadium(IV)–lanthanide(III) Schiff base complexes

K. Kotrle, I. Nemec, J. Moncol, E. Čižmár and R. Herchel, Dalton Trans., 2021, 50, 13883 DOI: 10.1039/D1DT01944A

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