Coordination compounds of transition metals with polydentate ligands containing nitrogen, oxygen and sulfur. Synthesis, structural architecture, properties
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StatusThe thesis was presented on the 2 July, 2021Approved by NCAA on the 4 October, 2021 Abstract – 0.97 Mb / in romanianThesisCZU 544.14:[546.30:546.17:546.21/.22](043.2)
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Keywords
coordination compounds, polymer, mixed ligands, X-ray diffraction, luminescenceSummary
Thesis structure: introduction, 4 chapters, conclusions and recommendations, literature containing 223 references, 9 attachments, 118 pages of basic text, 62 figures and 5 tables. The obtained results are published in 29 scientific publications.
The purpose of the thesis: design, synthesis, and structural study of transition metal compounds of different dimensionality with homo- and heterofunctional ligands and identification of their properties for potential application. Research objectives: design of coordination compounds, including polymers, based on Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) metals with ligands containing N,N, O,O, N,O, O,S and N,O,S donor atoms; synthesis of new designed compounds, determination of their crystal structure by X-ray diffraction and characterization of physico-chemical and biological properties.
Novelty and scientific originality: optimization of the synthesis methods of 46 coordination compounds, the correlation of structural data-spectral characteristics-properties. For the first time, a new way of coordination of sulfazalanine in Cd(II) coordination polymer was established. The synthesis of Zn(II) coordination polymer with unique ligand, resulting from condensation of 2-(4-oxo-2-thioxothiazolidin-3-yl) acetic acid has been elaborated. Modification for 2,2'-dithiodibenzoic acid, such as oxidative cleavage or extrusion of atom S, has been established. The obtained results that contribute to the solving of an important scientific problem are related to the elaboration of the optimal synthesis for 46 coordination compounds, including 38 coordination polymers with dimensionality from 1D to 3D, and the investigation of luminescent and adsorption properties, and biological activity.
Theoretical significance: the mutual influence of metals and ligands in the presence of bipyridine ligands on the formation of coordination polymers. Practical importance: the possibility of using coordination polymers with cavities for the incorporation of small molecules.
Implementation of the scientific results: A Zn(II) coordination polymer with new ligand exhibiting excellent antifungal and antibacterial properties has been proposed as an inhibitor in Escherichia coli, Staphylococcus aureus and Candida albicans strains. A Cd(II) coordination polymer with newly coordinated sulfazalanine was suggested as a luminescent material. Results protected by patents of the Republic of Moldova.
Oficial Reviewers
- Victor Ţapcov
doctor, associate professor (docent) - SPÎNU Cezar Ionuț
doctor în ştiinţe exacte, domeniul chimie, profesor universitar, Universitatea din Craiova, România
Council's Members
- Ion Bulhac, president
doctor habilitat, associate professor (docent), Institute of Chemistry of the ASM - Maria Cocu, secretary
doctor, associate professor (docent) - Aurelian Gulea, member
doctor habilitat, professor, Moldova State University - Vasile Lozan, member
doctor habilitat, associate professor (docent) - Maria Bîrcă,
doctor, associate professor (docent)
Theses
