Dinuclear Lanthanide(iii) Complexes Showing Single-Molecule Magnet Behaviour and Optical Properties
Ruo-Xi Chen A B , Ou Sun A , Yuan-Yi Xu A , Yue Qi A , Bo-Yu Xie A and Ting Gao
A C
A Key Lab of Functional Inorganic Material Chemistry (MOE), School of Chemistry and Materials Science, Heilongjiang University, No. 74, Xuefu Road, Nangang District, Harbin 150080, China.
B Technology Centre of Dalian Customs District, No. 60, Changjiang East Road, Zhongshan District, Dalian 116000, China.
C Corresponding author. Email: gaotingmail@sina.cn
Australian Journal of Chemistry 73(7) 647-653 https://doi.org/10.1071/CH19383
Submitted: 6 August 2019 Accepted: 20 January 2020 Published: 6 March 2020
Abstract
Three dinuclear lanthanide(iii) complexes with an acetate bridge, which are synthesised by a Salen-type Schiff base and β-diketonate ligands, i.e. [Ln2L2(TTA)4(OAc)2]·CH2Cl2 (Ln = Eu (1), Gd (2), Dy (3); TTA = thenoyltrifluoroacetonate, H2L = N,N′-ethylenebis(salicylideneimine), are investigated. We obtained the structures of complexes 1–3 by X-ray crystallography. Notably, in terms of the structure of these complexes, what is intriguing is that the acetate groups link two Lniii ions, whereas the cadmium ions do not coordinate. Lanthanide-based luminescence is exhibited by complex 1, which exists in both the solid state and a methanol solution. Through magnetic analysis, it is found that a field-induced single-molecule magnet behaviour is exhibited by complex 3, and the energy barrier is shown to be Ueff = 45.97 K.
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