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IUPAC Prize for Young Chemists - 2002
Honorable Mention

 

 

Gábor Lente receives one of four Honorable Mention awards associated with the IUPAC Prize for Young Chemists, for his Ph.D. thesis work entitled "Reactions of the Iron (III) Hydroxo Dimer with Inorganic Ligands."

Current address (at the time of application)

University of Debrecen,
Department of Inorganic and Analytical Chemistry,
H-4010, Debrecen, P.O.B 21, Hungary

E-mail: lenteg@delfin.klte.hu

Academic degrees

  • Ph.D. Chemistry, University of Debrecen, 2001
  • M.Sc. Chemistry, Lajos Kossuth University, 1997

Ph.D. Thesis

Title Reactions of the Iron (III) Hydroxo Dimer with Inorganic Ligands
Advisers Prof. István Fábián
Thesis Committee Prof. F. Joó, Department of Physical Chemistry; Prof. I. Sóvágó, Department of Inorganic and Analytical Chemistry; Dr. L. Somsák, Department of Organic Chemistry, University of Debrecen; Dr. Tamás Turányi, Eötvös Loránd University; Prof. György Bazsa, Department of Physical Chemistry, University of Debrecen; Dr. Ottó Horváth, Department of General and Inorganic Chemistry, University of Veszprém

Essay

Iron is the most abundant transition element in the solar system and on the earth. In the oxidative atmosphere of our planet it mostly occurs in the oxidation state of +3. The metal has been known to humankind since ancient times and has had an immense impact on history and culture. Iron is classified as essential in biological systems, where it is often found in oxo- or hydroxo-bridged di- or oligonuclear structures. Numerous enzymes with dinuclear iron(III) centers are known and their structural motifs can be used to design protein-free dinuclear iron(III) catalysts.

Iron(III) gives rise to polynuclear species in aqueous solution over a characteristic pH range. Mononuclear hydrolytic species are important in the kinetics and mechanism of substitution and redox reactions. It seems to be reasonable that polynuclear hydrolytic complexes may also have similar roles.

The major goal of this thesis was to characterize the kinetics and equilibrium of direct ligand substitution reactions of the aqueous iron(III) hydroxo dimer, Fe2(µ-OH)2(H2O)84+ , with simple inorganic ligands and draw structural and mechanistic conclusions from the results. A further objective was to explore the possible role of Fe2(OH)24+ in redox reactions between iron(III) and inorganic species with special emphasis on the iron(III) - sulfur(IV) system because of its outstanding environmental significance. Because of the complexity of the studied reactions, the traditional kinetic evaluation method based on pseudo first-order curves could only be employed in a few cases, and the rate constants in other systems were calculated by fitting the experimental kinetic traces directly to the simultaneous differential equations defined by the kinetic model.

<Download full-text essay, pdf file-77KB>

The thesis was written in English. The full text, the English and the Hungarian abstracts of the thesis were published on the Internet. They can be downloaded from the personal homepage of the author <http://www.klte.hu/~lenteg/index.html>.

 


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