Abstract

The hexanuclear compounds [Fe6O2Cl2{(py)(2)CO2}(2)(pyOH)(2)(pyCOO)(2)((BuCOO)-C-t)(6)] (1) and [Fe6O2{(py)(2)CO2}(2)(pyCOO)(4)((BuCOO)-C-t)(6)] (2) were obtained by condensation of the trinuclear mu(3)-oxo-centered iron(III) pivalate [Fe3O((BuCOO)-C-t)(6)(H2O)(3)](+) in the presence of di(2-pyridyl)ketone [(py)(2)CO] in MeCN at ambient temperature. Both complexes contain an analogous core which can be described as two {Fe3O}(7+) units joined by gem-diolato (py)(2)CO22- bridges. Variable-temperature magnetic susceptibility measurements in polycrystalline samples of 1 and 2 reveal strong antiferromagnetic couplings between the iron(III) ions leading to S = 0 ground states. (C) 2019 Elsevier Ltd. All rights reserved.