Published in Russian Journal of Inorganic Chemistry
AbstractStructural features of 16 mononuclear monooxotantalum complexes have been considered. In eleven compounds (I–XI), the Та(V) atoms have different coordination polyhedra with CNTa from four and seven: a tetrahedron, octahedron, pentagonal bipyramid, and monocapped trigonal prism. Five TaO compounds (XII–XVI) contain pentahapto-bonded η5-С5Ме5...
Published in Russian Journal of Physical Chemistry A
AbstractIn this work, we studied the thermodynamic parameters of the complexation reaction between europium and N,N '-diethyl-N,N '-difluorophenyl-2,2'-bipyridyl-6,6'-dicarboxamides in ethanol. The complexation reaction lead to one complex particle with 1 : 1 metal : ligand composition. Spectrophotometric and calorimetric titration methods were use...
Published in Russian Journal of Physical Chemistry A
AbstractIn the current study, the results of the conductometric work of the complexation reaction of Kryptofix5 (Scheme 1) with Al3+, Cu2+, Ca2+, and Fe3+ cations are studied in acetonitrile–ethanol (AN–EtOH) binary non-aqueous solvents. In all cases, the achieved results reveal that the stoichiometry of the complexes formed between the ligand and ...
The ofloxacin (OFLOX) is a second-generation synthetic antibiotic that can be classified as a multifunctional drug, but is a poorly soluble drug, which influences its efficiency. The inclusion complexes of OFLOX with β-cyclodextrin (βCD) or hydroxypropyl-β-cyclodextrin (HPβCD) can improve the chemical characteristics of the drug; however, studies s...
Published in Polish Journal of Chemical Technology
Palygorskite was applied in complexation-ultrafiltration treatment of heavy metals in wastewater under different pH and ionic strength. The results indicated that the rejection of heavy metals increased significantly with pH value, and decreased slightly with an increase of ionic strength of Na+ and Cl–. A certain concentration of NaCl significantl...
Published in Russian Journal of Inorganic Chemistry
AbstractThe relationship between the dielectric and radio brightness characteristics of aqueous solutions of (NH4)2[PdCl4] at low concentrations at 298.15 K were considered. The dielectric relaxation parameters representing the disturbance of the H-bond network in the transition from water to solution were calculated from experimental data on the c...
Published in Journal of Chemical Sciences
AbstractThe absorption and fluorescence spectral properties of three meso-substituted hydrophilic thiacarbocyanine dyes were studied in solutions and in noncovalent complexes with human and bovine serum albumins (HSA and BSA, respectively). The presence of alkyl substituents at the meso-position of the polymethine chain of the dyes determines the o...
Published in Russian Journal of General Chemistry
AbstractThe equilibrium processes of the formation of mononuclear and some binuclear silver(I) complexes with thiourea, N-acetylthiourea, thiosemicarbazide, N-phenylthiourea, and N,Nʹ-diphenylthiourea at 25°C and I = 0.11 M. (0.01 M HNO3 + 0.1 M NaNO3) in aqueous solution were studied by potentiometry method with a silver electrode. The stability c...
Published in Russian Journal of General Chemistry
AbstractThe metal exchange reactions of Cd(II) 5,10,15,20-tetra(4-chlorophenyl)porphyrinate with CuCl2 and ZnCl2 in DMSO were studied by the spectrophotometric method. The kinetic parameters of the metal exchange reactions were determined. A possible reaction mechanism was proposed. Zinc(II) and copper(II) 5,10,15,20-tetra(4-chlorophenyl)porphyrina...
Published in Russian Journal of Physical Chemistry A
AbstractInteraction between L-methionine (Met) and nicotinic acid (NA) in an aqueous buffer solution (pH 7.4) is studied via dissolution calorimetry and densimetry. The thermodynamic characteristics of the formation of a 1 : 1 molecular complex between Met and L at Т = 298.15 K are determined. The experimental density of the Met–L–buffer system is ...
