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RESEARCH ARTICLE
Contents Vol 68(3)

Dinuclear Lanthanide–Carboxylate Compounds: Field-Induced Slow Relaxation of Magnetization for Dysprosium(iii) Analogue

Yi-Lei Li A , Qing-Yan Liu A C , Cai-Ming Liu B , Yu-Ling Wang A C and Ling Chen A
+ Author Affiliations
- Author Affiliations

A College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.

B Beijing National Laboratory for Molecular Sciences, Institution of Chemistry, Chinese Academy of Sciences, Center for Molecular Sciences, Beijing 100190, China.

C Corresponding authors. Emails: qyliuchem@hotmail.com; ylwang@jxnu.edu.cn

Australian Journal of Chemistry 68(3) 488-492 https://doi.org/10.1071/CH14348
Submitted: 30 May 2014  Accepted: 30 June 2014   Published: 15 September 2014

Abstract

Three chiral dinuclear lanthanide compounds, Ln2(µ2-L)4(L)2(phen)2 (Ln = Dy (1), Gd (2), and Er (3); phen = 1,10-phenanthroline), have been synthesized using the (S)-(+)-2-(6-methoxy-2-naphthyl)propionic acid (HL) ligand. The two lanthanide centres in compound Ln2(µ2-L)4(L)2(phen)2 are bridged by four carboxylate groups to give a dinuclear Ln2(µ2-L)4 core. The square antiprismatic coordination environment for each lanthanide centre is further completed by a chelating carboxylate group from another L– ligand and two nitrogen atoms from the phen ligand. A weak antiferromagnetic interaction between the two GdIII ions is observed in compound 2. The Dy analogue displays field-induced slow magnetic relaxation behaviour with an effective energy barrier Ueff/k of 17.24(2) K and a pre-exponential factor τ0 of 2.7(1) × 10–6 s. However, no slow relaxation phenomenon was observed for the Er derivative even in the presence of 2 kOe applied field.


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