Dynamics of Fe atoms in Fe-gluconate as seen by M\"ossbauer spectroscopy

TL;DR

This study investigates the behavior of Fe atoms in Fe-gluconate across a temperature range using Mössbauer spectroscopy, revealing details about their oxidation states, spin states, and vibrational properties.

Contribution

It provides new insights into the oxidation and spin states of Fe in Fe-gluconate and measures vibrational parameters using Mössbauer spectroscopy.

Findings

Major component identified as high-spin Fe2+

Minor component possibly high-spin Fe3+ or low-spin Fe2+

Debye temperatures and force constants determined

Abstract

Fe-gluconate was studied by means of the M\"ossbauer spectroscopy in the temperature interval of 80-305K. The measured spectra were analyzed in terms of two subspectra and, alternatively, two distributions of the quadrupole splitting. The major component (ca.85%) was identified as due to high-spin Fe2+ ions while the identification of the minor component (ca.15%) was not unique: some characteristics are in favour of the high-spin Fe3+ state while other ones are consistent with the low-spin Fe2+ state. Values of the Debye temperature were determined for both phases from a temperature dependence of the center shift as well as from that of the spectral area. The force constant for the high-spin ferrous atoms was evaluated to be equal to 44 N/m (243 cm-1).