Szilárd szerves mikroemulzióban rögzített vas(II)aszkorbát-oldat Mössbauer-vizsgálata

Burger, Kálmán and Nemesvetessy, Z. and Vankó, György and Homonnay, Zoltán and Vértes, Attila and Dékány, Imre and Szekeres, Márta (1995) Szilárd szerves mikroemulzióban rögzített vas(II)aszkorbát-oldat Mössbauer-vizsgálata. MAGYAR KÉMIAI FOLYÓIRAT (1895-1996), 101 (11). pp. 483-487. ISSN 0025-0155

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Abstract

In contrast with a methanolic solution of SnCl4 trapped in the pores of a rigid organic microemulsion, iron(II) species in the bulk of ascorbic acid-containing methanolic solution in a similar microemulsion are not fixed strongly enough to achieve recoilless gamma-ray resonance absorption at room temperature. The Mossbauer effect appears only below 260 K, at temperatures higher than the freezing point of methanol, indicating the fixing of the solution of Mossbauer-active solutes in the carrier. Comparison of the QS values of the iron(II) species in the microemulsion and those in solution quenched by quick-freezing, both at 80 K, suggests that both chloride and ascorbate ligands are coordinated to iron(II) in the submicroscopic (nano-size) droplets, in contrast with the quenched solution, which contains iron(II)-ascorbate complex cations in equilibrium with chloride ions. This difference may be explained by the decreased solvation of the species in the submicroscopic droplets, due to the decreased concentration of bulk solvent in the microemulsion.

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