A new copper(II) complex with acetylacetone and ethylenediamine is obtained using the template synthesis. It is studied by single crystal X-ray diffraction. The crystals are monoclinic: а = 7.7563(4) Å, b = 24.0157(12) Å, c = 24.6353(13) Å, β = 91.9490(10)°, V = 4586.2(4) Å3, space group P2(1)/c, Z = 2, d calc = 1.713 g/cm3, R = 0.0695. The copper atom environment consists of two oxygen and two nitrogen atoms of the ligand, forming a slightly distorted square.

A styrene–maleic anhydride copolymer is synthesized, modified in the presence of p-sulfoaniline and formaldehyde, and a new polymer adsorbent is obtained and identified by IR spectroscopy. The ionization constants of ionogenic groups in the adsorbent are determined by the potentiometric method. The adsorption and desorption of lead(II) on the obtained adsorbent are investigated, and optimal conditions of preconcentration are determined. An adsorption–photometric procedure for the determination of lead is proposed, including the adsorption preconcentration of lead(II) from a buffer solution with pH 6 and desorption with a solution of HCl (with the desorption rate of up to 99%). The procedure was used to determine lead in the cattle liver.

A new complex of copper (II) with 3-(2-hydroxy-3-sulfo-5-nitrophenylazo)-pentadione-2,4 (HL) is synthesized and analyzed by single crystal XRD. The crystals are monoclinic: a = 7.7563(4) Å, b = 24.0157(12) Å, c = 24.6353(13) Å, β = 91.9490(10)°, V = 4586.2(4) Å3, space group P21/c, Z = 2, ρcalc = 1.713 g/cm3, R = 0.0695. The environment of the copper atom is formed by three oxygen atoms, the nitrogen atom of tetradentate ligand, and the oxygen atom of a water molecule.

The crystal structure of copper(II) complex with the HL ligand obtained from 3-[4-carboxyphenylazo] penta-2,4-dione and ethylenediamine (En) was determined by X-ray diffraction. The crystals are orthorhombic: a = 7.329(3), b = 15.393(5), c = 18.474(7) Å, V = 2084.1(12) Å3, space group P212121, Z = 4, ρ(calcd.) = 1.486 g/cm3, R = 0.0441. The copper atom is coordinated by four nitrogen atoms of two En ligands and by the chlorine atom in an axial position according to the extended square pyramid geometry (4 + 1) (CIF file CCDC no. 1436882).

The sorption and complexing properties of styrene/maleic anhydride copolymer-based modified sorbent in relation to molybdenum(VI) have been studied and main quantitative characteristics of metal ion sorption have been defined. A sorbent containing p-phenylenediamine fragments has been proposed for selective extraction of molybdenum(VI) from solutions. Optimal sorption conditions are defined. The influence of various mineral acids (HClО4, H2SО4, HNО3, HCl) on molybdenum(VI) desorption from the sorbent has been studied. The experiment has revealed that maximum molybdenum(VI) desorption occurs in sulfuric acid. The molybdenum(VI) extraction rate in optimal conditions exceeds 95 %. Methods of sorption-photometric determination of molybdenum(VI) in sea water have been developed.

Complexation of bismuth (III) with 2,3,4-trihydroxy-4’-sulfoazobenzene in presence and in the absence of nonionic surfactant - Triton X-114 - is studied. An acidic environment (pH 2.5 - 3.0) promotes formation of ternary complex with a maximum light absorption at λ = 464 nm. Optimal conditions of complex formation are specified and the basic spectrophotometric characteristics of binary and ternary complexes of bismuth (III) are calculated. A new sensitive and highly selective method for determination of bismuth in pharmaceuticals and in standard samples of copper-based alloys is developed.

Single crystal X-ray diffraction is used to determine the crystal and molecular structure of 4-trifluoro-2-[2-(4-fluorophenyl)hydrazine-1-ylidene]-1-(thiophen-2-yl)butane-1,3-dione. Crystallographic data for C 14 H 8 F 4 N 2 O 2 S are as follows: a = 8.2723(6) Å, b = 9.3009(7) Å, c = 9.9895(7) Å; α = 79.224(2)°, β = 75.851(2)°, γ = 72.337(2)°. Triclinic crystal system, P -1 space group, d x = 1.622 g/cm 3 , V = 704.83(9) Å 3 , μ = 0.286 mm −1 , crystal size 0.30×0.20×0.20 mm, R 1 = 0.0891, wR 2 = 0.1989.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

, R = 0.0700. Окружение атома меди сформировано четырьмя атомами кислорода двух молекул тиенилтрифторацетилацетона и атомом кислорода ДМСО. , Z = 2, (выч.) = 1.696 мг/м3, R = 0.0700. Окружение атома меди сформировано четырьмя атомами кислорода двух молекул тиенилтрифторацетилацетона и атомом кислорода ДМСО.

The 3-[4-fluorophenylazopentandion]-2,4 reagent is synthesized based on acetylacetone, and its crystal and molecular structure is studied by X-ray diffraction. It is found that [C 11 H 11 N 2 O 2 F] crystals 1 belong to the monoclinic symmetry, C2 / c space group. The unit cell parameters of 1 are a = 18.827(3) Å, b = 12.839(2) Å, c = 26.475(5) Å, β = 104.834(2)°. The analysis shows that the reagent is present in the solution as well as in the crystal. A comparative analysis of these three structures with the reported data is carried out.

A nickel(II) complex with 4,4,4-trifluoro-1-(2-thienyl)butane-1,3-dione and dimethyl sulfoxide, [Ni(C 8 H 4 F 3 O 2 S) 2 (C 2 H 6 OS) 2 ], was obtained and examined by X-ray diffraction. The crystals are monoclinic: a = 7.557(2) Å, b = 17.854(3) Å, c = 10.470(2) Å, β = 106.412(3)°, V = 1355.1(4) Å 3 , ρ calcd = 1.611 g/cm 3 , Z = 2, space group P 2 1 , R = 0.032. The coordination polyhedron of the nickel atom is a distorted octahedron consisting of four equatorial O atoms of two β-diketonate ligands and two axial O atoms of DMSO. The average Ni-O ax and Ni-O eq distances are 2.083(2) and 2.019(2)Å, respectively. The crystal structure is built from the discrete mononuclear complexes [Ni(C 8 H 4 F 3 O 2 S) 2 (C 2 H 6 OS) 2 ] linked only by van der Waals contacts.

A new copper(II) complex with thienyltrifluoroacetone (Tfa) and dimethyl sulfoxide (DMSO), Cu(Tfa)2DMSO, was synthesized, and its X-ray diffraction analysis was carried out. The crystals were triclinic: a = 9.4496(5), b = 10.5075(6), c = 11.9160(6) Å, α = 82.600(1)°, β = 84.116(1)°, γ = 77.904(1)°, V = 1143.8(1) Å3, space group P \(\bar 1\), Z = 2, ρcalcd = 1.696 mg/m3, R = 0.0700. The environment of the copper atom was formed by four oxygen atoms of two thienyltrifluoroacetylacetone molecules and one oxygen atom of DMSO.