Luminita Patron

Iron, nickel and zinc malates coordination compounds cynthesis, characterization and thermal behaviour

The coordinations compounds (NH4)[Fe(C4H4O5)(OH)2]·0.5H2O, [Ni(C4H4O5)]·3H2O and [Zn(C4H4O5)]·5H2O were synthesized by a precipitation method and characterized by chemical analysis, spectral (IR, UV-VIS) and magnetical investigations. In the range 50-600°C stepped thermal decompositions occur with formation of anhydrous malates, malonates, oxoacetates (iron and nickel compounds) and hydroxocarbonate (Zn compound) as intermediates observed by FT-IR spectroscopy. α-Fe2O3, NiO and ZnO constitute the final decomposition products.

Molecular Docking Studies Involving Transitional Metal Complexes (Zn(II), Co(II), Cu(II), Fe(II), Ni(II) with Cholic Acid (AC) as Ligand against Aurora A Kinase

Colorectal cancer is a malignant tumor, one of the main types of cancer which produces a large number of deaths each year in many countries around the world. The main objective of this work is to employ various bioinformatics tools to perform docking of the transitional metal complexes (Zn (II), Co (II), Cu (II), Fe (II), Ni (II)) with cholic acid (AC) as ligand against Aurora A Kinase (RCSB Protein Data Bank code: 2X6E). Molegro Virtual Docker (MVD) was used for the docking process. The molecular docking score and the values of the statistic parameter Root Mean Square Deviation (RMSD) are presented in Table 1. The results obtained in this study serve to design new complex combinations with potential action against Aurora A Kinase inhibitor.

Some Polynuclear Coordination Compounds Precursors of Chromites Synthesis, Physicochemical Characterization and Thermal Stability

The polynuclear coordination compounds LnCr(tartrate)3·nH2O where Ln(III)=La-Er, obtained through a precipitation method, were characterized on the basis of elemental analysis, their electronic and vibrational spectra and magnetic susceptibility measurements. The possibility of obtaining chromites through the transformations of the polynuclear coordination compounds in the solid state was considered. The thermal decompositions of these compounds, studied by TG and DTA methods, were found to follow an almost uniform pattern. The decompositions occurred in six-eight steps. The first two steps involved dehydration, and the third the transformation of tartrate anions to oxalate, followed by conversion to carbonate and oxocarbonate intermediates. The final product in each case was LnCrO3. A non-isothermal kinetic analysis of the first decomposition steps was performed, the most probable decomposition mechanism being selected and the kinetic parameters evaluated. The final products of the transformations were characterized.

Polynuclear coordination compounds as precursors for CuFe2O4

The possibility of obtaining copper ferrite through the thermal decomposition of the two polynuclear coordination compounds: (NH4)8[Fe2Cu(C2O4)8] (I) and [Fe2Cu(C2O4)2(OH)4]·4H2O (II) was considered. The polynuclear compounds were characterized by various physical chemical techniques, e.g., IR, UV-VIS, EPR, Mossbauer spectra, thermal analysis and magnetic measurements. The final products obtained after thermal decomposition of the complex compounds were analysed by X-ray diffraction. A mixture of tetragonal CuFe2O4, α-Fe2O3 and CuO is generated from the thermolysis of compound I, while a clean tetragonal CuFe2O4 with saturation magnetization of 26.89 emu g−1 is obtained from compound II.

New synthesis routes for obtaining dysprosium manganese perovskites

Abstract Dysprosium manganese perovskite DyMnO 3+ δ has been synthetized via thermal decomposition of polynuclear coordination compound precursors, containing as ligands polyhydrocarboxylic acid anions (malic, tartric and gluconic). The evolution of crystal symmetry has been interpreted by considering the effect of the Mn 4+ content, which depends on the nature of the precursor, namely the complexing agent. DyMnO 3+0.07 generated from a malic precursor presents an orthorhombic structure. In DyMnO 3+0.13 obtained from a tartric compound a two-phase mixture of the orthorhombic and hexagonal structure is detected. A pure hexagonal compound DyMnO 3+0.20 is obtained from a gluconic derived oxide.

Magnetic and spectral properties of two five-coordinate Lewis-base adducts of cobalt(II) Schiff-base complexes with a N3O2 ligand environment

Abstract Two new five-coordinate Lewis-base adducts of cobalt(II) N2O2 Schiff-base complexes, [Co(Salpad)2(t-MeStpy)] and [Co(H2(fsa)2phn)(t-MeStpy)]·0.5H2O (where H(Salpad)=2-[N-(4-phenylaminophenyl)formimidoyl]phenol, H4(fsa)2phn=N,N′-o-phenylenebis(3-carboxysalicylaldimine), and t-MeStpy=trans-1-(4-methylphenyl)-2-(4-pyridyl)ethene), have been synthesized in order to investigate the influence of the in-plane donor atom topology on the spin-state of the cobalt(II) ion. The compounds have been characterized by analytical and spectroscopic methods. The spin-state behavior of cobalt(II) was investigated by variable-temperature magnetic susceptibility measurements over the temperature range 10–380 K. For [Co(Salpad)2(t-MeStpy)] the magnetic data indicate a spin-quartet ground state which can be described using an axial spin Hamiltonian (D=16.57 cm−1, g=2.39 for CoN2O2N′) with additional temperature-independent paramagnetism (Nα=360×10−6 cm3 mol−1). The compound [Co(H2(fsa)2phn)(t-MeStpy)]·0.5H2O undergoes a thermally-induced S=1/2↔S=3/2 spin equilibrium at high temperatures. The magnetic properties of the four-coordinate [Co(Salpad)2] precursor are also reported here.

Thermal behaviour of some solid coordination compounds with malic acid as ligand

Abstract The authors present the results concerning the synthesis and the characterisation of some coordination compounds with malic acid as ligand: Co(C 4 H 4 O 5 )·2H 2 O, [Fe 2 (C 4 H 4 O 5 )(OH) 4 ]·4H 2 O and [Fe 2 Co(C 4 H 4 O 5 ) 2 (OH) 4 ]·6H 2 O. The heterometallic compound is a precursor of Co-ferrite. The values of the non-isothermal kinetic parameters for the dehydration reactions were determined. These values obtained by three integrals methods are in a satisfactory agreement.

Non-isothermal decomposition kinetics of polynuclear coordination compounds

Abstract Results concerning the thermal stability and decomposition kinetics of four polynuclear coordination compounds are presented.

Synthesis, Characterization and Thermal Decompositions Studies of Some Malates Coordination CompoundsI. iron nickel compounds

The thermal behaviour of three coordination compounds, potential precursors of nickel ferrite [Fe2Ni(C4H4O5)2.5(OH)2]NO3·5H2O,[Fe2Ni(C4H8O3N2)4](NO3)8·24H2O and (NH4)[Fe2Ni(C4H4O5)3(OH)3]·3H2O has been investigated to evaluate their suitability as precursors for nickel ferrite. For a complete and reliable assignment of the thermal transformations, the isolable solid intermediates and end products were characterized by IR, X-ray diffraction and Mössbauer investigations. A decomposition scheme is proposed.

New synthetic route in obtaining copper chromite I. Hydrolysis of some soluble salts

Abstract The possibility of obtaining copper chromite through thermal decomposition of some polynuclear coordination compounds, [Cr2Cu(NH3)2(OH)6](NO3)2 and [Cr2Cu(OH)8]·4H2O obtained through hydrolytic decomposition of chromium and copper soluble salts was considered. A decomposition mechanism of the pattern compounds is proposed. A pure tetragonal Cr2CuO4 with mean crystallite sizes varying in the range 133–210 A was obtained between the temperature limits 823 K-1073 K.