Heterometallic 3d-4f single-molecule magnets: ligand and metal ion influences on the magnetic relaxation

Inorganic Chemistry
Stuart K LangleyKeith S Murray

Abstract

Six tetranuclear 3d–4f single-molecule magnet (SMM) complexes formed using N-n-butyldiethanolamine and N-methyldiethanolamine in conjunction with ortho- and para-substituted benzoic acid and hexafluoroacetoacetone ligands yield two families, both having a butterfly metallic core. The first consists of four complexes of type {Co2(III)Dy2(III)} and {Co2(III)Co(II)Dy(III)} using N-n-butyldiethanolamine with variation of the carboxylate ligand. The anisotropy barriers are 80 cm–1, (77 and 96 cm–1—two relaxation processes occur), 117 and 88 cm–1, respectively, each following a relaxation mechanism from a single DyIII ion. The second family consists of a {Co2(III)Dy2(III)} and a {Cr2(III)Dy2(III)} complex, from the ligand combination of N-methyldiethanolamine and hexafluoroacetylacetone. Both show SMM behavior, the Co(III) example displaying an anisotropy barrier of 23 cm–1. The Cr(III) complex displays a barrier of 28 cm–1, with longer relaxation times and open hysteresis loops, the latter of which is not seen in the Co(III) case. This is a consequence of strong Dy(III)–Cr(III) magnetic interactions, with the relaxation arising from the electronic structure of the whole complex and not from a single DyIII ion. The results suggest th...Continue Reading

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Citations

Apr 7, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Yan PengAnnie K Powell
Aug 17, 2016·Chemistry : a European Journal·Alejandro V FunesPablo Alborés
Jan 11, 2017·Chemistry, an Asian Journal·Haifeng ZhangYaping Dong
Mar 23, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·A AmjadL Sorace
Feb 28, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Alejandro V FunesPablo Alborés
Oct 30, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Angelos B CanajConstantinos J Milios
Apr 6, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Susanta HazraSasankasekhar Mohanta
May 18, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Sihuai ChenAnnie K Powell
Oct 26, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Susanta HazraArmando J L Pombeiro
Oct 6, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Xiufeng WangLicun Li
Nov 25, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Marco ColettaScott J Dalgarno
Jun 21, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Amit ChakrabortyVadapalli Chandrasekhar
Aug 8, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Qipeng LiQihua Zhao
Jul 23, 2019·Chemistry, an Asian Journal·Atanu DeyVadapalli Chandrasekhar

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