SPECTROSCOPIC INVESTIGATIONS OF IRON(II) AND IRON(III) OXALATES

M. C. D’ANTONIO; A. WLADIMIRSKY; D. PALACIOS; L. COGGIOLA; A. C. GONZÁLEZ-BARÓ; E. J. BARAN; R. C. MERCADER

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY

SOC BRASILEIRA QUIMICA

Año: 2009 vol. 20 p. 445 - 450

0103-5053

In an attempt to contribute to a better characterization of Fe II and Fe III oxalate complexes, an investigation of their vibrational (infrared and Raman) and  57Fe-Mössbauer spectra was performed. It is shown that the two polymorphs,  alpha and beta, of FeC2O4.2H2O cannot be accurately differentiated with any of these spectroscopic methods, demonstrating the high structural similarity of these two crystalline forms. Partially deuterated samples of  beta-FeC2O4.2H2O were also investigated to improve the vibrational-spectroscopic analysis. In the case of Fe2(C2O4)3.4H2O, a structural model, derived from results of combined vibrational and Mössbauer data, could be proposed. The 298 K Mössbauer spectrum for this complex is discussed in detail for the irst time.