Crystal structure and spectroscopic behavior of three new tris-oxalatoferrate(III) salts

Abstract

A new general synthetic procedure for preparation of Na₃[Fe(C₂O₄)₃]·5H₂O (1), Rb₃[Fe(C₂O₄)₃]·3H₂O (2), and Cs₃[Fe(C₂O₄)₃]·2H₂O (3) was developed. The crystal structures of these salts have been determined by single crystal X-ray diffraction. Salt 1 crystallizes in the monoclinic space group C2/c with Z = 8, salt 2 in P2₁/c with Z = 4, and salt 3 in P2₁/n with Z = 4. The three new salts and K₃[Fe(C₂O₄)₃]·3H₂O, prepared for comparative purposes, were further characterized by infrared and ⁵⁷Fe-Mössbauer spectroscopy. These spectra are discussed in comparison with those of related oxalato complexes.

Keywords:

• Tris-oxalatoferrate(III)
• alkaline salts
• crystal structures
• infrared spectra
• ⁵⁷Fe-Mössbauer spectra

Acknowledgements

OEP, GAE, RCM, and ACGB are Research Fellows of CONICET.

Disclosure statement

No potential conflict of interest was reported by the authors.