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X-ray diffraction and Mössbauer spectrometry studies of molecular iron compounds

Authors: B.F.O. Costa, J.M. Greneche, M. Ramos Silva

Ref.: Nuclear Instruments and Methods in Physics Research A 580, 408-411 (2007)

Abstract: We have synthesized two new iron complexes that have been structural and magnetically characterized: diphenylguanidinium hexafluoroferrate and hexakisvaline-oxo-triiron(III) chloride. The former crystallizes as monomers with the fluoride ions six-coordinating the Fe(II) ion. Valine iron chloride is comprised of trinuclear complexes, with a well ordered oxo-centered carboxylate core and some disordered organic ligands. The magnetization curves show a paramagnetic behavior. The Mossbauer measurements as a function of temperature show a paramagnetic behavior at 300K with two Fe sites (one quadrupolar doublet and a broad single line). At 4.2 K, besides the quadrupolar doublet there is a magnetic component which can be attributed to a slow relaxation phenomenon associated to these samples. (C) 2007 Elsevier B.V. All rights reserved.

DOI: 10.1016/j.nima.2007.05.066