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Author: Denis Prodius Degree: doctor of chemistry Speciality:  02.00.01 - Inorganic chemistry Year: 2007 Scientific adviser: Constantin Turtă doctor habilitat, professor, Institute of Chemistry of the ASM Institution: Scientific council:

Status The thesis was presented on the 30 April, 2007 Approved by NCAA on the 14 June, 2007 Abstract – 0.79 Mb / in romanian Thesis CZU 541.49+546.723’40’650+ +537.621+543.429.3+543.442.3 errata 5.15 Mb / in romanian 125 pages

Keywords

Summary

The work is devoted to the synthesis and research to process of formation of the homo- and heteropolynuclear oxo-carboxylate clusters of iron(III) with halogenocarboxylic acids (dicloroacetic, tricloroacetic) and different solvents. About 26 complexes were synthesised for the first time, which structure was revealed by the following physical methods: IR and thermogravimetry, magnetochemistry, electron paramagnetic resonance, Mössbauer spectroscopy and x-ray structural analysis investigations are described in the work.

The methods of synthesis of three-nuclear heterometallic carboxylates with common formula [Fe2MllO(CCl3COO)6(THF)n] (Mll = Mg; Ca, Sr, Ba) are described for the first time, which have been prepared by means of interaction of iron(III) nitrate with tricloroacetates of bivalent metal. As result of interaction between lanthanide(III) nitrate and heteronuclear iron tricloroacetate [Fe2BaO(CCl3COO)6(THF)6] the new row of heterometallic tetranuclear carboxylates [Fe3LnO2(CCl3COO)8(H2О)(THF)3] are obtained.

It was demonstrated that problem of metal position’s localization in {Fe2MO} fragment can be successfully solved via inclusion of monodenthate ligands with different affinity to iron and metal into cluster’s inner sphere.

In the wide range of temperature the magnetic susceptibilities of representatives of the homo- and heteronuclear iron carboxylates have been studied. It was shown that the anomaly magnetic properties are based on antiferromagnetic interaction between three paramagnetic metal ions. On the example of heterotetranuclear complexe [Fe3EuO2(CCl3COO)8(H2О)(THF)3] for the first time was demonstrated possibility of intramolecular ferromagnetic interaction in such type of carboxylates containing iron.

It was shown, that the property of a single molecular magnet (SMM) of dodecanuclear oxocarboxylate cluster with {Mn12O12} fragment can be maintained even at change of number of electrons in system, which takes place with replacement of ions Mn (III) on Fe (III).

Was revealed that [Fe2M(Mn,Ni)O(CCl3COO)6(CH3OH)3] complexes posses properties as biostimulators of carothenoid biosynthesis and biomass quantity increasing of Rhodotorula gracilis yeast’s cultivation.

Oficial Reviewers

• Mihail Revenco
  doctor habilitat, professor, Moldova State University
• Paulina Bouroş
  doctor, associate professor (docent), Institute of Applied Physics of the

 Theses