Indium is transferred by the tartaric acid in the strong complex in aqueous medium. Then the selenizing solution (solution of selenium on sodium tetraborate) is added. The voluminous sediment of yellow color turns out. Composition of the determined by differential thermal analysis and electron microprobe analysis. The qualitative analysis of this sediment has shown the presence of indium and selenium. In various experiments are produced sediments of different colors when medium pH changes. The set of experiments has been carried out to specify color change and hydrogen ions concentration impact. This FeIn2Se4 compound for production FeSO4x7H2O is mixed with In2Se4 in the molar ratios 2:3 (FeIn2Se4) with the presence of acetate acid (pH=7-3), at 293-353 K in aqueous medium. In organic medium test within 10 hours at 413 – 443 K to temperature remains in the furnace. Phase analysis of FeIn2Se4 is studied using the X-ray powder diffraction (XRD) and chemical analysis. The compound FeIn2Se4 crystallized in hexagonal singoniya a=4.012 Å, c=39.21 Å. Morphological investigations have been performed using scanning electron microscopy (SEM). Optical absorption is measured using a spectrophotometer, IK spektr analysis on the basis of the spectrum, which has been read from the dispersed solution of FeIn2Se4 is calculated. Differential thermal analysis (DTA) ofFeIn2Se4 compound is observed one endothermic effect. In the system Tg=1158 K aqueous medium, Tg=1123 K organic medium endothermic effect corresponds to the melting point of the combination. In this iron indium selenide efficiency is 92.2 %.

In the present study, an Au(III) complex of caffeine (CA) and nicotinamide (NA) was synthesized under refluxing conditions. The preparation and structural elucidation of the complex were investigated by using physicochemical, and spectroscopic methods (UV/Vis, LC-MS, FT-IR, 1H and 13C NMR, XRD) and thermal analysis. The spectral measurements of mixed ligand complex of CA and NA with the Au(III) suggested that atoms of the ligands are coordinated to gold ion. Based on spectral and magnetic moment measurements, the complex was identified as in square-planar structure. From these analyses, it is predicted that the complex has the form of [Au(CA)2(NA)2]Cl3.2H2O.

In this study, Cr (III) removal from aqueous solutions was investigated by using the batch adsorption method. An orange peel activated with potassium carbonate (OPAPC) was used as the adsorbent. In order to determine optimum adsorption conditions, adsorbent concentration (2-15 g/L), pH (3-7), temperature (298-318 K), contact time (10-270 min) and initial concentration of Cr (III) (5-50 mg/L) were investigated for Cr (III) removal from aqueous solutions using OPAPC. The equilibrium data were evaluated using the Langmuir and Freundlich model equations and the kinetic data were evaluated with pseudo first and second order kinetic models. In addition, the adsorption thermodynamics of the proposed method in optimum conditions was investigated.

In the present work, firstly the novel mono oxime (1) and asymmetric dioxime ligand (LH2) (2) derived 4'-hydroxyvalerophenone as ketone were prepared under optimum conditions. Then, the bis-dioxime-based and boronic acid-capped groups containing Fe(II) and Co(II) complexes [(L)2M(X)2(BA)2] (3-6) (L= Dioxime, M = Fe(II) or Co(II), X= Cl2 or H2O and BA = Butyl boronic acid (BBA) or Ferrocene boronic acid (FBA)) were synthesized in a two-necked round-bottom reaction flask by direct contact of dioxime ligand (2), and different boronic acid with metal salts (FeCl2.4H2O or CoCl2) without special requirement of any additional chemical process. The prepared ligands and its Fe(II) and Co(II) complexes were characterized by means of NMR spectra, FT-IR spectra, UV-Vis spectra, LC-MS, melting point and magnetic susceptibility measurements as well as elemental analysis. The spectroscopic results demonstrated that the proposed Fe(II) and Co(II) complexes are a six-coordinated species and octahedral geometry. The infrared spectra (FT-IR) of the Fe(II) and Co(II) complexes indicated the characteristic peak at range 1208-1217 cm-1 cm corresponding ?(B-O) stretching.

A zinc–nicotinate complex, {[Zn(na)2(µ-pbix)]·H2O}n (1), was obtained from the reaction of zinc(II) acetate with nicotinic acid (Hna) and 1,4-bis(imidazol-1-ylmethyl)benzene (pbix) in water at 120 °C under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, single crystal and powder X-ray diffraction. The thermal stability and luminescent property for 1 were also reported. The asymmetric unit of 1 consists of one zinc(II) center, one pbix ligand, two na anions and one non-coordinated water molecule, giving a formula of {[Zn(na)2(µ-pbix)]·H2O}n. The Zn(II) ion is coordinated by two nitrogen atoms from two different 1,4-bis(imidazol-1-ylmethyl)benzene ligands and two oxygen atoms from two different nicotinate (na) anions, thus showing a distorted tetrahedral geometry. The adjacent Zn(II) ions are linked into an infinite 1D zigzag chain by 1,4-bis(imidazol-1-ylmethyl)benzene ligands. Grand canonical Monte Carlo (GCMC) simulations were also performed to compute single-component H2 adsorption isotherms at a pressure range of 0.01–100 bar and at 298 K and 77 K. The maximum H2 uptake in 1 was found as 68 cm3/ g STP at 100 bar and 77 K. This study will be useful to accelerate the hydrothermal synthesis of new coordination polymers for gas storage applications.

In this study, N-hydroxymethyl acrylamide (HMAm) monomer was mixed with Na-Montmorillonite (Na-MT) in different ratio. The mixture was polymerized in the presence of benzoyl peroxide (Bz2O2) with in-situ radical polymerization to prepare poly(N-hydroxymethyl acrylamide) (PHMAm)/Na-Montmorillonite (Na-MT) composites. Purified Na-MT, and also produced composites with different ratio were characterized with Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal analysis (TGA/DTA) techniques. The moisture retention, water uptake, adsorptive properties of composites was also researched. The XRD pattern demonstrated that Na-MT layers intercalated into the PHMAm matrix. The composites displayed much better thermal stability than the pure polymer.

Corrosion is the degradation of a metal, which is caused by chemical reactions between the metal and its surroundings. It poses severe and inevitable problems to the long-term use of particularly copper-based materials in daily life due to the requirement of periodically replacement of it and the loss of its appearance. Therefore, it is necessary to apply a protective layer on them to extend the life span. In this study, inorganic-organic hybrid coatings comprising thiol functional silanes on copper sheets were obtained by spraying onto it followed by curing at elevated temperature. All coatings studied were optically transparent, smooth and crack-free. As they showed excellent adhesion to the copper surface, they were resistant to UV radiation and solutions of acidic and basic conditions. By the coating of copper sheets with hybrid coatings studied, both their mechanical durability and corrosion resistance in the salt spray test were considerably improved.

In the present work, certain novel o-hydroxy Schiff bases and possible tautomer forms, which were previously synthesized by our group and their structures elucidated, have been calculated by DFT/6-311g(2d,2p) in both vacuum and polar solvents and the most stable tautomeric forms have been determined. The acidity constants of the Schiff bases have been calculated with the PM6 method by MOPAC2016. HOMO-LUMO values of the studied Schiff bases were calculated with DFT/6-311g(2d,2p) and their possible molecular electronic properties were searched. The results were compared with those experimental values.

Ternary compounds (nano- and microparticles) of AgAsSe2 and Ag3AsSe3 have been synthesized from approximately equimolar mixtures of silver nitrate, sodium metaarsenite and sodium selenosulfate with prepared by refluxing selen powder with concentrated sodium sulfite solution under hydrothermal conditions in ethylene glycol medium. The solutions were put into a 100 mL Teflon-lined stainless steel autoclave Speedwave four BERGHOF and sealed and then heated at the temperature of 443 K during 8 hours (pH = 5-4). The products were filtered via the glass filter and washed by deionized water and absolute ethanol for several times, then dried at 353 K in vacuum oven for at least 1 hour for analysis. The thermogravimetric (TG) and electron microprobe analysis have been carried out. The results showed that the composition of silver selenoarsenates compounds corresponding to the formule AgAsSe2 and Ag3AsSe3. The results of SEM image and shows the typical morphologies of synthesized products in which tubular and stick shaped like nano-particles can be observed and their size can be estimated from 140 nm to 310 nm. The compound of AgAsSe2 and Ag3AsSe3 was constructed using X-ray phase and differential-thermal analyses. It is ascertained by X-ray powder diffraction (XRD) that the parameters of AgAsSe2 crystallized in the tetragonal space group R3-m with a = 12.54 Å, c = 11.14 Å, a = 900, ß = 900,? = 900, Z = 5, Ag3AsSe3 (this compound is an allotrope of ß-Ag3AsSe3) crystallizes in the orthorhombic space group Pnma, a = 8.11 Å, b = 11.34 Å, c = 20.73 Å, a = 900, ß = 900,? = 900, Z = 8. The results of differential thermal analysis (DTA) AgAsSe2 compound is melting congruently at Tg = 683 K, Ag3AsSe3 with incongruent type of melting at Tg = 663 K was established.