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CNAA / Theses / 2010 / July /

Synthesis and Study of Homo- and Heteronuclear Transition Metal Clusters with Heterocyclic Carboxylic Acids

Author: Melnic Silvia
Degree:doctor of chemistry
Speciality: 02.00.01 - Inorganic chemistry
Scientific adviser: Constantin Turtă
doctor habilitat, professor, Institute of Chemistry, Academy of Sciences of Moldova
Institution: Institute of Chemistry, Academy of Sciences of Moldova
Scientific council: DH 05-02.00.01
Institute of Chemistry, Academy of Sciences of Moldova


The thesis was presented on the 9 July, 2010
Approved by NCAA on the 6 October, 2010


Adobe PDF document0.78 Mb / in romanian


oxo-carboxylates of iron(III), heteropolynuclear clusters, 2-furancarboxylic acid, lanthanides, nanoparticles, Mössbauer spectroscopy, luminescence, stimulators of biosynthesis


Doctor’s thesis in Chemistry. Chisinau, 2010. Introduction, three chapters, conclusions, bibliography of 218 references, 116 pages of main text, 46 figures, 5 diagrams and 15 tables. The results are published in 21 scientific papers.

Area of Research and Objectives. The thesis is focused on the synthesis and study of both homo- and heteronuclear oxo-carboxylate clusters of Fe(III), and lanthanide complex compounds derived from 2-furancarboxylic acid. The objectives of this scientific work include improving the well-known methods for synthesis of carboxylates, developing new methods for synthesis, obtaining and studying homo- and heteronuclear d, d-d, f, f-s type complexes; synthesis and study of nanoparticles based on iron(III) furoates; obtaining complexes possessing biological active properties.

Scientific Novelty and Originality. 36 newly synthesized homo- and heteronuclear compounds derived from 2-furancarboxylic acid are described in the thesis. Method for synthesis of lanthanide heterometallic carboxylates of the general formula {[Ln2MII(C5H3O3)8(H2O)4]}n, where Ln is a 4f metal; M is Sr2+, Ba2+, has been first described. Five different types of coordination for 2-furancarboxylic acid have been discovered in these systems. The dependence of the magnetic properties on the geometry of the coordination polyhedron has been established for gadolinium(III) complexes. The method for synthesis of γ-Fe2O3 nanoparticles on the basis of iron(III) furoates has been developed and implemented. It has been discovered that iron(III) homo- and heteronuclear furoates posses bioactive properties.

Theoretical and Application Value. The results of theoretical and experimental magnetic studies of synthesized f-s type clusters will expand knowledge of the nature of exchange magnetic interaction, which is particularly important for understanding the magnetic properties of materials. The use of a newly developed method for synthesis of f-s type carboxylates for obtaining new complexes with expected properties in preparative chemistry is also of a practical significance. The optimal conditions for synthesis of γ-Fe2O3 nanoparticles, using sunflower oil as a surfactant, have been determined. Polynuclear complexes of Fe(III) with 2-furancarboxylic acid posses the properties of biostimulators for Spirulina platensis growth, enzymatic activity of catalase, as well as anti-tuberculosis properties.