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Title: X-ray diffraction and Mössbauer spectrometry studies of molecular iron compounds
Authors: Costa, B. F. O. 
Greneche, J. M. 
Silva, M. Ramos 
Pereira, L. C. J. 
Keywords: Trinuclear iron compounds; Mössbauer spectrometry; X-ray diffraction
Issue Date: 2007
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 580:1 (2007) 408-411
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 Mössbauer measurements as a function of temperature show a paramagnetic behavior at 300 K 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.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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