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A new example of a tetranuclear iron(III) cluster containing the [Fe4O2] core: preparation, X-ray crystal structure, magnetochemistry and Mössbauer study of [Fe4O2(O2CMe)6(N3)2(phen)2] |
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| Authors: | Athanassios K. Boudalis Vassilis Tangoulis Aris Terzis Spyros P. Perlepes |
| Affiliation: | a Department of Chemistry, University of Patras, 265 04 Patras, Greece b Department of Materials Science, University of Patras, 265 04 Patras, Greece c Institute of Materials Science, NCSR “Demokritos”, 153 10 Aghia Paraskevi Attikis, Greece d Laboratoire de Chimie de Coordination du CNRS, UPR 8241, 205 route de Narbonne, 31077 Toulouse Cedex 04, France |
| Abstract: | Two synthetic procedures have been employed that allow access to the new tetranuclear cluster [Fe4O2(O2CMe)6(N3)2(phen)2] (1), where phen is 1,10-phenanthroline. Complex 1 · 3MeCN displays an unusual structural asymmetry (observed for the second time) in its [Fe4O2]8+ core that can be considered as a hybrid of the bent (butterfly) and planar dispositions of four metal ions seen previously in such compounds with transition metals. Complex 1 has been characterized by variable-temperature magnetic susceptibility studies, and by IR and variable-temperature 57Fe Mössbauer spectroscopies. Magnetochemical data reveal a diamagnetic ground state (S=0) with antiferromagnetic body-body and body-wingtip interactions between the iron(III) ions of the butterfly core (Jbb=−11 cm−1, Jwb=−70 cm−1). Magnetochemical and Mössbauer studies on 1 show that its structural asymmetry has practically no influence on these properties compared with the more symmetric types. |
| Keywords: | Azido complexes Iron(III) acetate clusters Iron(III)/1,10-phenanthroline complexes Magnetic properties Mö ssbauer spectra Tetranuclear iron(III) complexes |
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