Quadrupole splitting and paramagnetic iron core structure in iron-dextran complexes: A Mossbauer effect study

The pharmaceutically important iron-dextran complexes (ferritin models) wer e studied by Mossbauer spectroscopy in frozen solution at 87 K and in lyoph ilized form at 297 and 87 K. The quadrupole splittings of the lyophilized f orms of iron-dextran complexes measured at 297 and 87 K were slightly diffe rent. The quadrupole splittings of several complexes in lyophilized form an d frozen solutions measured at 87 K were also different. Slight differences in the quadrupole splitting were found for various iron-dextran complexes. Mossbauer spectra of iron-dextran complexes were better fitted using two q uadrupole split doublets. Slight differences in the corresponding quadrupol e splittings and doubler ratios were observed for various complexes.