作者
Luca Rigamonti, Marco Piccioli, Luigi Malavolti, Lorenzo Poggini, Matteo Mannini, Federico Totti, Brunetto Cortigiani, Agnese Magnani, Roberta Sessoli, Andrea Cornia
发表日期
2013/5/20
期刊
Inorganic Chemistry
卷号
52
期号
10
页码范围
5897-5905
出版商
American Chemical Society
简介
A new tetrairon(III) single-molecule magnet with enhanced volatility and processability was obtained by partial fluorination of the ancillary β-diketonato ligands. Fluorinated proligand Hpta = pivaloyltrifluoroacetone was used to assemble the bis(alkoxido)-bridged dimer [Fe2(OEt)2(pta)4] (1) in crystalline form, from which the new tetranuclear complex [Fe4(L)2(pta)6] (2) was synthesized in a one-pot reaction with H3L = 2-hydroxymethyl-2-phenylpropane-1,3-diol, NaOEt, and FeCl3 in a Et2O:EtOH solvent mixture. The structure of compound 2 was inferred from 1H NMR, mass spectrometry, magnetic measurements, and DFT calculations. Direct current magnetic data are consistent with the expected metal-centered triangular topology for the iron(III) ions, with an antiferromagnetic coupling constant J = 16.20(6) cm–1 between the central iron and the peripheral ones and consequent stabilization of an S = 5 spin ground …
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