5^th International Conference on Organic and Inorganic Chemistry July 12-13, 2018 Paris, France
Venue: Holiday Inn Paris Marne La Vallee

Dmitry Zhigalov is a Researcher of the State Research Institute for Chemistry and Technology of Organoelement Compounds (GNIICHTEOS). His scientific interests cover synthesis, structure and reactivity of polycarbosilanes and nanometallopolycarbosilanes, as well as obtaining components of ceramic composite materials on their basis.

Researches of GNIICHTEOS have developed and patented a highly efficient method for the preparation of pre-ceramic nanometallopolycarbosilanes containing nanoparticles of refractory metal (Zr, Hf and Ta) compounds. It is found that all synthesized nanometallocarbosilanes have fiber-forming properties. Polymer fibers were prepared from them, their curing (in an oxidizing atmosphere), and pyrolysis resulted in the formation of silicon carbide fibers modified by compounds of refractory metals (Zr, Hf, Ta). The morphology of the surface and elemental composition of samples of SiC fibers modified by Hf and Ta compounds was studied, and also, unmodified SiC fibers samples were analyzed for comparison using a scanning electron microscope Philips SEM505, equipped with a Sapphire Si(Li) SEM10 energy dispersive detector and a Micro Capture SEM3.0M image capture system. It is found that refractory metals absorb oxygen with the formation of inert products (HfO2, Ta2O5), which protect the surface of the SiC fibers, increasing its thermal stability.

Galina Shcherbakova has completed her Phd in Chemistry, and currently she is a Leading Researcher of the State Research Institute for Chemistry and Technology of Organoelement Compounds (SSC RF “GNIIChTEOS”). Her scientific interests include synthesis, structure and reactivity of organoelement and organometallic compounds; fundamentals of new materials creation; nanoparticles, nanomaterials; development of new structural materials and coatings. She has published more than 30 papers in peer-reviewed journals.

Chelated alkoxyalumoxanes readily interact with acetylacetonates of yttrium and magnesium in various combinations and ratios. The reaction results in organomagnesium oxane yttrium oxide alumoxane oligomers with homogeneous distribution of metals in oligomer matrix at the molecular level. Chelated alkoxyalumoxanes interaction with the hydrate of yttrium acetylacetonate and with magnesium acetylacetonate may be presented by the following scheme: [Al(OR)s(OR*)x(OH)pOq]m+a(R**О)3Y•2,5Н2О+k(R**О)2Mg→(s−l)RОH++[(R**О)MgO]k•[Al(OR)l(R**О)g(OR*)x(OH)zOy]m•[(R**О)hY(OH)tOr]a(I), where a, k=0.1-6 m=3-12; s+x+2q+p=3; k/m+l+g+x+2y+z=3; h+2r+t=3; R– СnН2n+1, n=2,4; R*– C(CH3)=CHC(O)OС2Н5; R**–C(CH3)=CHC(O)CH3. The reaction proceeds at 50-70ºС in ethyl alcohol, breakdown of alumoxanes bonds is not observed therewith. First of all, the reaction proceeds with the hydroxyl groups, and then with the alkoxy groups at Al to form YОAl and MgОAl bonds. Hydrolytically stable in air, soluble in organic solvents organomagnesium oxane yttrium oxane alumoxanes, depending on a, k, m values in compound (I), are viscous liquids or hard brittle substances from light yellow to reddish brown, reacting with acids and alkalies. Their composition and structural features have been studied by advanced physicochemical methods (1Н, 13C, 27Al NMR, IR, SEM, and TGA).

Marina Avaliani has completed his PhD in N Kurnakov Institute of Inorganic Chemistry in Moscow. His Post-doctoral study was executed in Tbilisi State University and is Head of Scientific Themes. He has published 95 scientific papers in reputed journals.

In aim to search for new condensed compounds as well as to study the impact of trivalent and monovalent cations for the formation of inorganic polymer’s anionic radicals and the level of condensation, we have studied multicomponent systems containing monovalent and trivalent metals: - - - at 1300 -5500C (which MI is Ag, M III – Ga, In and Sc). The double oligo- and cyclophosphates are primarily synthesized and firstly examined by us. General dependency of structural composition and stability of double condensed phosphates from ion radius of M1 - are also examined. Synthesized compounds are investigated and were detailed examined/identified by X-Ray phase’s analysis, paper chromatography and thermogravimetric analysis. Analyzing the experimental data shows that we obtained the following condensed phosphates: acidic di- and triphosphates of Ga, In and Sc with silver , and double cyclotetraphosphates , , AgInP4O12. It was established the cristallization regions of mentioned phosphates. We can conclude that condensed compounds of scandium-silver, according to their composition and structure, coincide with phosphates of Ga-Na and Sc-Na and are not similar to corresponding compounds of rare earth elements. Moreover it has been discovered that at relatively low temperatures it is more probable to produce double acidic phosphates, with increasing synthesis temperature double tetraphosphates of Ga-Ag, In-Ag and Sc-Ag are formed. Mentioned tetraphosphates are isomorphic among themselves and are iso-structural with the Sodium-Gallium double condensed tetraphosphates. Via comparison of the obtained compounds with appropriate phosphates we conclude that while the radius of trivalent metal decreases, the polyphosphate chain identity period upsurges. The cycles slowly appears, the number of structural types growth is caused by correlation of average distances between ( ) and ( ). It should be emphasized that the various new bio-materials appear on the base of condensed phosphates.rnrn

Mariya Blokhina is a Researcher of the State Research Institute for Chemistry and Technology of Organoelement Compounds. Her scientific interests cover synthesis, structure and reactivity of nanometallopolycarbosilanes, as well as ceramic composite components produced materials on their basis.

The researchers of GNIIChTEOS have synthesized ceramic-forming nanohafniumtantalum carbosilanes (HfTaPCS) with a specified molar ratio of Ta:Hf metal atoms, which allow after the pyrolysis of HfTaPCS obtaining SiC ceramics modified with mixed refractory metal carbides with a maximum melting point. Nanohafniumtantalumcarbosilanes are obtained by reacting raw polycarbosilane (raw PCS) with alkylamide compounds of hafnium and tantalum of Hf(NR2)4 formula, where R–CH3, C2H5 and of Та(NR12)5-2z(=NR2)z formula where R1 – CH3, C2H5, R2 – t-C4H9, z = 0, 1. Physicochemical properties of the synthesized HfTaPCS and ceramics samples obtained as a result of pyrolysis of HfTaPCS at 1100°C in argon were studied by NMR, IR, TGA, X-ray phase analysis, SEM, elemental analysis. The obtained polymers can be used as precursors for preparing components of high-temperature resistant ceramic composites based on silicon carbide modified by mixed carbides of refractory metals (Hf and Ta).

Tatiana Apukhtina has completed her PhD from State Research Institute for Chemistry and Technology of Organoelement Compounds. She is the Senior Researcher at the institute. Her scientific interests cover physical-mechanical and physical-chemical analysis of components of ceramic composite materials

High-temperature oxide alumo-yttrium fibers were prepared by melt-molding of fiber forming organo-yttrium oxane alumoxanes those were for the first time synthesized at GNIIChTEOS. The molding was carried out at temperature of 60-150°C, with the following heat treatment in air at 1300-1500°C. The obtained alumo-yttrium fibers were studied by physicochemical methods (SEM, IR, X-ray phase analysis). It is found that, depending on the molar ratio of Al:Y in the initial organo-yttrium oxane alumoxanes, the ceramic fibers consist of the following phases: corundum α-Al2O3, garnet Y3Al5O12 (YAG), YAlO3 (YAР) and Y4Al2O9 (YAM). It is known that these structures have high melting points. Therefore, the obtained fibers can be used to prepare high-heat-resistant and chemically inert ceramic composites.

University of Baghdad, Baghdad, Iraq

The synthesis of ligand systems with N2S2 donor sets that include imine, an amide, thioether and thiolate moieties and their metal complexes are achieved. The new Schiff-base ligands; N-(2-((2,4-diphenyl-3-azabicyclo[3.3.1]nonan-9-ylidene)amino)ethyl)-2-((2-mercapto ethyl)thio)acetamide (H2L1) and N-(2-((2,4-di-p-tolyl-3-azabicyclo[3.3.1]nonan-9-ylidene) amino)ethyl)-2-((2-mercaptoethyl)thio)acetamide (H2L2) were synthesised from the reaction of amine precursors with 1,4-dithian-2-one in the presence of triethylamine as a base in the CHCl3 medium. Complexes of the general formula K2[M(Ln)Cl2], (where: M = Mn (II), Co(II) and Ni(II)) and [M(Ln)], (where: M = Cu(II), Zn(II) and Cd(II); n =1-2, expect [Cu(HL2)Cl]) were reported. The entity of ligands and complexes including their purity were confirmed using elemental microanalysis (C.H.N.S), atomic absorption (A.A), chloride content, molar conductance, melting point and thermal analysis technique. while the molecular structures were elucidated with FT-IR, UV-Vis, magnetic susceptibility, 1H, 13C and DEPT 13CNMR and mass spectroscopy. The prepared ligands and their complexes were tested against a range of bacterial strains (G+ and G-) and fungi species. The tested compounds indicated that; the ligands have not shown any antimicrobial activity against Escherichia coli. The Cd(II) complex for ligands H2L1 and H2L2 display the higher antimicrobial activity, compared with the other complexes. The H2L1 and H2L2 ligands have not shown any activity against Candida albicans. All complexes for ligands (H2L1 and H2L2) exhibited less activity against Candida albicans, compared with other types of fungi. These results are quite comparable with some commercial drugs that used for bacterial and fungi species.