نشریه شیمی کاربردی روز
پیاپی 12 (پاییز 1388)

We have inserted aromatic rings to [5, 6, 7] quinarene and obtained compound 7 as a very stable quinarene. Methyl groups in the structure of quinarene increase its solubility and help to identify the structure with spectroscopic methods. The structure of this new quinarene was identified using CHN, MS, NMR, UV, IR methods. Ultraviolet spectrum of this compound shows λmax at 460nm which is 100 nm less than expected value. PPP-MO and semi empirical calculations with HyperChem program showed that five, six and seven membered rings are not coplanar and seven membered ring which is more flexible is out of the plan of other two rings. For [5, 6, 7] quinarene 7 λmax (460nm) is not varied with solvent polarity which agrees well with structure of quinarene obtained.

A polymer was synthesized from a mixture of epoxy resin and mica for electrical insulation purposes. When epoxy resin is mixed with mica powder and a suitable curing agent is subsequently added to this mixture so that it melts at a specific temperature, a paste-like homogeneous mixture is obtained which could be moulded as this film. These films have insulating properties. The insulation period of this insulator could also reach up to 20 Kilovolts.

In this project, extraction of Magnesium Chloride has been studied and a semi-industrial method, which uses calcimined dolomite, has been suggested. In order to determine the effect of different factors such as time, pH and etc. on the product yield artificial solution containing distinct of Mg2+ and So42- were prepared and then the best condition of extraction of Magnesium salt was studied. The real samples were prepared from Urmia Lake, and similar studies were performed on them. Measurement of Calcium and Magnesium ions existing in extracted samples has been done by employment of titration method

Titanium dioxide TiO2, occurs in nature in the modifications rutile, anatase, and brookite. Rutile and anatase are produced industrially in large quantities and are used as pigments and catalysts, and in the production of ceramic and electronic materials. Titanium dioxide is of outstanding importance as a white pigment because of its scattering properties (which are Superior to those of all another white pigments), its chemical stability, and lack of toxicity. Titanium dioxide is the most important inorganic pigment in terms of quantity, 3.2 × 106 t were produced in 1995. Titanium dioxide pigments are produced by two different processes, Sulfate method and Chloride method. The production of TiO2 in this project is based on Sulfate method from concentrated ilmenite with assay of 40.29%, which the final assay has reached to 93.32% and the yield to 13.82%.

This paper reports a new green synthesis for some anthranilic derivatives as new opaque compound in radiography in poly (ethylene) glycol as a green and reusable solvent. In opaque reagents there are polar functional group and non polar one. The polar functional group increases its solubility in water and decreases its half-life and makes it easy to defecate. The non polar functional group, (usually iodine) increases its lipophilicity. Furthermore iodine absorbs radiation and makes it opaque. On theory this duality hydrophile-lipophile must be explained by dipole moment term. By using semi-empirical AM1 method the dipole moment of some anthranilic acid derivatives calculated and compared whit some commercial available drugs. The calculations show that our new compounds could be the good choices for starting laboratory experiences for determining their biological effects. Further more there is the possibility of simple replacement benzyl group to change its dipole moment and its X-ray absorption.

In this work production of nano powders by means of sol-gel route were reviewed. Proposed mechanisms, required materials such as solvents or solutes that used for production of industrial nano powders and the effects of them on the characteristics of products were evaluated. Various processes that used for production of nano metal fluorides such as AlF3 and MgF2, nano composites such as Al2O3-ZrO2 and nano metal oxides such as TiO2 and TiO2 adapted to Mg2+ and Br2+ were also reviewed.

The aim of this work is to synthesis a polyaniline with high conductivity by chemical oxidative polymerization under ultrasonic irradiation. The aniline polymerization carried out by addition of initiator such an ammonium peroxydisulfate (APS) in aqueous medium under ultrasonic irradiation in inert atmosphere. The influence of synthesis conditions such as the duration of reaction time, concentration of the oxidant, concentration of HCl and presence of air atmospher or inert gas in the obtained polyaniline were investigated. The optimum conditions for the synthesis of polyaniline with better conductivity were determined. Our results demonstrate that polyaniline conductivity depends on the conditions such as, concentration of HCl, presence of oxygen in the reaction medium and molar ration of the initiator. Ultrasonic irradiation is employed to assist the chemical oxidative polymerization of aniline in the presence of ammonium peroxydisulfate(APS).The optimum molar ration of the initiator to the monomer aniline is 2.5:2. The electrical conductivity of polyaniline synthesis by optimized condition was 23.46 S/cm measured at (0-4)C°. The obtained polyaniline characterized by FT-IR, UV-Vis, Xrd, DSC and SEM.