Single-molecule magnet behavior for an antiferromagnetically superexchange-coupled dinuclear dysprosium(III) complex

Jérôme Long; Fatemah Habib; Po-Heng Lin; Ilia Korobkov; Gary Enright; Liviu Ungur; Wolfgang Wernsdorfer; Liviu F Chibotaru; Muralee Murugesu

doi:10.1021/ja109706y

Single-molecule magnet behavior for an antiferromagnetically superexchange-coupled dinuclear dysprosium(III) complex

J Am Chem Soc. 2011 Apr 13;133(14):5319-28. doi: 10.1021/ja109706y. Epub 2011 Mar 22.

Authors

Jérôme Long¹, Fatemah Habib, Po-Heng Lin, Ilia Korobkov, Gary Enright, Liviu Ungur, Wolfgang Wernsdorfer, Liviu F Chibotaru, Muralee Murugesu

Affiliation

¹ Department of Chemistry, University of Ottawa, 10 Marie-Curie, Ottawa, ON, K1N6N5, Canada.

PMID: 21425794
DOI: 10.1021/ja109706y

Abstract

A family of five dinuclear lanthanide complexes has been synthesized with general formula [Ln(III)(2)(valdien)(2)(NO(3))(2)] where (H(2)valdien = N1,N3-bis(3-methoxysalicylidene)diethylenetriamine) and Ln(III) = Eu(III)1, Gd(III)2, Tb(III)3, Dy(III)4, and Ho(III)5. The magnetic investigations reveal that 4 exhibits single-molecule magnet (SMM) behavior with an anisotropic barrier U(eff) = 76 K. The step-like features in the hysteresis loops observed for 4 reveal an antiferromagnetic exchange coupling between the two dysprosium ions. Ab initio calculations confirm the weak antiferromagnetic interaction with an exchange constant J(Dy-Dy) = -0.21 cm(-1). The observed steps in the hysteresis loops correspond to a weakly coupled system similar to exchange-biased SMMs. The Dy(2) complex is an ideal candidate for the elucidation of slow relaxation of the magnetization mechanism seen in lanthanide systems.