نشریه شیمی کاربردی روز
پیاپی 13 (زمستان 1388)

A ultrathin film (8- 19 nm) composed of carbon nanoparticles and poly(diallyldimethylammonium chloride) or CNP-PDDAC is formed in a layer-by-layer deposition process at tin-doped indium oxide (ITO) substrates. Excess positive binding sites within this film in aqueous phosphate buffer at pH 7 are quantified by adsorption of indigo carmine. Characterization of film was performed by using spectrophotometry, atomic force microscopy, impedance spectroscopy, adsorption and solution redox systems. For the mixed redox system ascorbate – dopamine in 0.1 Mphosphate buffer pH 7 cyclic voltammograms suggest a rapid and selective temporary poisoning process which causes the ascorbate oxidation to be suppressed in the second potential cycle. This effect is exploited for the detection of micromolar concentrations of dopamine in the presence of millimolar ascorbate.

In this study the amount of sodium sulfate extraction from Urmia Lake and the optimized conditions were investigated using local climate and minimum energy via non evaporative methods. Because of ampleness of sodium sulfate supplies in Iran and also chemical inertness of this compound in production processes and as are salt the simplicity of equipment needed, studying technical points and working conditions are very important. To determine the effect of different factors such as time, temperature, etc. On the yield of products and extra purity of sodium sulfate, samples of lake water taken using vessels with the same size and conditions, and the methods of sodium sulfate extraction in environment temperature without using evaporative methods were investigated. Other elements such as Chlorine, Magnesium, Calcium, Sodium, and Potassium were also analyzed in the extracted salt. More over, economic investigations on sodium sulfate extraction were done and some plans for semi industrial and industrial projects were suggested to extract sodium sulfate with the minimum energy and cost.

In the present research work 5 samples of powder detergent including famous optical brightneer were prepared.Except this optical brightneer, amount of other ingredients were same in all formulation.Then optimum amount of O.B. have been determined.

The precise Liquid - liquid equilibrium (LLE) data are needed and required in design of many chemical processes, separation operations, and fermentation industry. In this research, (LLE) data for (trichloroethylen + propionic acid + water) were determined at atmospheric pressure and 300.15 K. LLE phase diagram was obtained for this ternary system. The distribution coefficients and the selectivity factors of the solvent were calculated. It can be seen that the separation factor values decrease from 10.55 to 4.317 with increasing propionic acid weight fraction in aqueous phase from 0.06 to 0.4.

In this study production procedure of P.V.C by suspension method were investigated. The experiments were conducted by using vinyl chloride (99.5 %), jelatin, AIBN as an initiator in a reactor which was equipped with thermometer, mixer and a cooling system. The optimum ratio of monomer to (water - ethanol), optimum initiator concentration, optimum temperature were determined to be (100 g / 200 ml, 0.2 g, 60º C) respectively. The optimum inherent viscosity was found to be 0.95 in cyclohexanon solvent. For quantitative analysis of chlore in P.V.C a Schiff method was used. A value 37 % chlore in P.V.C was obtained.

This project describes the synthesis, characterization and investigation of solvatechromic behavior of novel oxovanadium(IV) complexes containing tetradentate N4 type Schiff base ligands derived from condensation of 1,2-ethylenediamine, meso-1,2-diphenyl-1,2-ethylenediamine and 1,3- propanediamine with 2-pyridinecarbaldehyde. All of the ligands (L1, L2 and L3) and complexes (VOL1, VOL2 and VOL3) were synthesized according to the well-known literature procedure and were characterized with IR, 1HNMR, UV-Vis methods. The novel VOL1, VOL2 and VOL3 complexes were obtained with (V=O) stretching band about 960-980 cm-1. All of the complexes characterized in monomeric structure. The complex VOLx (X = 1, 2 and 3) is considerably soluble in a wide variety of solvents and shows solvatochromic behavior. The 2B2 2E(I) transition wavenumber shows a linear correlation to the D.N. of the solvents.

Synthesis of 3-hydroxy cefuroxime antibiotic has been reported using 7-aminocephalosporanic acid (7-ACA) and 2-furanyl-Z-2-methoxy iminoacetic acid salt. Synthesis of this compound was carried out in three steps with good yield; omitting acetyl group or in fact hydrolysis of 7-aminocephalosporanic acid (7-ACA) to produce 7-amino-3-hydroxy methyl cephalosporanic acid and then chlorination of 2-furanyl-Z-2-methoxy imino acetic acid salt by phosphorus pentachloride and finally coupling of 7-amino-3-hydroxy methyl cephalosporanic acid and 2-furanyl-Z-2-methoxy imino acetyl chloride.