Issue 37, 2019
From the journal:

Dalton Transactions

Slow magnetic relaxation in Ni–Ln (Ln = Ce, Gd, Dy) dinuclear complexes†

Anna Vráblová, ORCID logo ab   Milagros Tomás, ORCID logo *c   Larry R. Falvello, ORCID logo b   Ľubor Dlháň,d   Ján Titiš, ORCID logo e   Juraj Černák ORCID logo *a  and  Roman Boča ORCID logo e  

* Corresponding authors

a Department of Inorganic Chemistry, Institute of Chemistry, P. J. Šafárik University in Košice, Moyzesova 11, Košice, Slovakia
E-mail: juraj.cernak@upjs.sk

b Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Inorgánica, University of Zaragoza–CSIC, E-50009 Zaragoza, Spain

c Centro de Quimica y Materiales de Aragón (CEQMA-ISQCH), Departamento de Química Inorgánica, Pedro Cerbuna 12, University of Zaragoza–CSIC, E-50009 Zaragoza, Spain
E-mail: milagros.t@csic.es

d Institute of Inorganic Chemistry, Slovak University of Technology, 812 37 Bratislava, Slovakia

e Department of Chemistry, FPV, University of SS Cyril and Methodius, 917 01 Trnava, Slovakia

Abstract

Three new isomorphous complexes [Ni(o-van-en)LnCl3(H2O)] [H2(o-van-en) = N,N′-ethylene-bis(3-methoxysalicylaldiminate; Ln = Ce (1), Gd (2), Dy (3)] were prepared by a stepwise reaction using mild conditions and were structurally characterised as dinuclear molecules in which Ni and Ln are coordinated by the compartmental Schiff base ligand (o-van-en)= and doubly bridged by O atoms. While the nickel(II) centre is diamagnetic within the N2O2 square-planar coordination of the Schiff base ligand, the lanthanide atoms are octa-coordinated to give an {LnCl3O5} chromophore with a fac-arrangement of the chlorido ligands. AC magnetic measurements revealed that all three complexes, including the nominally isotropic Gd(III) system, show field induced slow magnetic relaxation with two or three relaxation channels: at T = 1.9 K the low-frequency relaxation time is τLF(1) = 0.060 s at BDC = 0.5 T, τLF(2) = 0.37 s at BDC = 0.3 T, and τLF(3) = 1.29 s at BDC = 0.15 T.

Graphical abstract: Slow magnetic relaxation in Ni–Ln (Ln = Ce, Gd, Dy) dinuclear complexes

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Article information

DOI
https://doi.org/10.1039/C9DT02122A
Article type
Paper
Submitted
20 May 2019
Accepted
17 Aug 2019
First published
23 Aug 2019
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2019,48, 13943-13952

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Slow magnetic relaxation in Ni–Ln (Ln = Ce, Gd, Dy) dinuclear complexes

A. Vráblová, M. Tomás, L. R. Falvello, Ľ. Dlháň, J. Titiš, J. Černák and R. Boča, Dalton Trans., 2019, 48, 13943 DOI: 10.1039/C9DT02122A

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