US EPA

2233062 

Journal Article 

Anion effects on the structures and magnetic properties of binuclear lanthanide single-molecule magnets 

Yang, F; Zhou, Q; Zeng, G; Li, G; Gao, L; Shi, Z; Feng, S 

2014 

Yes 

Dalton Transactions
ISSN: 1477-9226
EISSN: 1477-9234 

43 

3 

1238-1245 

English 

24178710 

10.1039/c3dt52634h 

WOS:000328654000037 

http://pubs.rsc.org/en/Content/ArticleLanding/2014/DT/C3DT52634H#!divAbstract
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Here we report the anion-induced changes of structures and magnetic properties in binuclear lanthanide compounds. Firstly, two Dy(3+)-based compounds, [Dy2(Mq)4(NO3)6] (1) and [Dy2(Mq)4Cl6](EtOH)2 (2) (Mq = 8-hydroxy-2-methylquinoline), were synthesized and characterized. They contain similar binuclear Dy2O2 cores, while the different peripheral anions lead to quite different coordination environments of the Dy(3+) ion. In compound 1, the Dy(3+) ion is nine-coordinated and characterized by a distorted 4,4,4-tricapped trigonal prism environment. In compound 2, the Dy(3+) ion has a highly distorted six-coordinated octahedral environment. Their Gd(3+) analogues, [Gd2(Mq)4(NO3)6] (3) and [Gd2(Mq)4Cl6](EtOH)2 (4), were also studied to investigate the magnetic interaction between metal ions. Variable-temperature dc magnetic susceptibility measurements show that all the compounds are weakly antiferromagnetically coupled. Ac magnetic susceptibility measurements reveal that both compounds 1 and 2 exhibit single-molecule magnet (SMM) behaviour, while the thermal energy barrier of 2 is significantly higher than that of 1 (Δ/k(B) = 40.0 K for 1 and Δ/k(B) = 102.4 K for 2).