| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1335963 | Polyhedron | 2011 | 5 Pages |
A propeller-like tetrairon(III) complex functionalized with two 1,2-dithiolan-3-yl groups was synthesized and magnetically characterized. The compound has formula [Fe4(thioctic)2(dpm)6] and was specifically designed to be grafted on gold surfaces. It was prepared by reacting [Fe4(OMe)6(dpm)6] (Hdpm = dipivaloylmethane) with a new tripodal ligand, H3thioctic, obtained by esterification of 2,2-bis(hydroxymethyl)-propane-1,3-diol with (±)-α-lipoic acid (also known as thioctic acid). Direct current and alternating current magnetic measurements revealed single-molecule magnet behaviour with an effective anisotropy barrier of 14.0(1) K resulting from a high spin (S = 5) ground state and an easy-axis anisotropy.
Graphical abstract1,2-Dithiolan-3-yl groups, derived from thioctic acid, were incorporated in the structure of propeller-like tetrairon(III) single-molecule magnets in view of their direct deposition on gold surfaces. The new functionalization preserves a S = 5 ground spin state and slow magnetic relaxation at low temperature.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► A novel tripodal ligand specifically designed for grafting tetrairon(III) single-molecule magnets (SMMs) to gold via a 1,2-dithiolan-3-yl group and an ester linkage was synthesized and fully characterized. ► The corresponding tetrairon(III) adduct was isolated in good yield and characterized by DC and AC magnetic measurements to confirm its core structure. ► The results revealed a single-molecule magnet behaviour for this new tetrairon(III) complex, with a S = 5 ground state, an easy-axis anisotropy and slow magnetic relaxation at low temperature.
