Applied Chemistry

Methyl-2-dihydroxyphenylsulfide was synthesized with the aim of characterizing antioxidant action. Its ability to break off oxidation chain in the reaction with peroxide radicals, as well as parameter of f•k which characterizes inhibiting activity of inhibitor, were studied.

A high molecular weight linear unbranched polymers free of macrocycles has been synthesized by long polycondensation time under high-intensity mixing conditions at about 80°C between cheaper chloro-monomers (instead of fluorinated monomers)1 and 5,5’,6,6’-tetrahydroxy-3,3,3’,3’-tetramethylspirobisindane (TTSBI). From the porosity analysis, it is clear that the prepared polymers are analogous to polymers of intrinsic microporosity (PIMs) with high surface area (500-700 m2/g). The hydrogen storage capacity of the prepared PIM-Cl(1-7) and were promising (up to 1.19 wt%, 77 K, at 1.13 bar). The results of this study demonstrate that controlling polymerization condition can provide a uniform microporous morphology in the target polymers.

The second order reaction rate constant for the reaction of Cinnemaldehyde with aniline have been reported in ethanol in the temperature range 303 to 318 k .The rate of reaction is first order with respect to Cinnemaldehyde and first order with respect to aniline. Increase in temperature increases the rate of reaction. The thermodynamic parameters are used to explain the nature of reaction .Suitable reaction mechanism has been suggested for the formation of the Schiff base.

Nanotechnology deals with various structures of matter having dimensions of the order of a billionth (1x10^-9) of a meter. In recent years nanotechnology has become one of the most important and exciting forefront fields in physics, chemistry, engineering and biology. Particles which are smaller than the characteristic lengths associated with particular phenomena often display new chemistry and physics, leading to new behavior which depends on the size. So, for example, the electronic structure, conductivity, reactivity, melting temperature and mechanical properties have all been observed to change when particles become smaller than a critical size. Nanotechnology is expected to enable environmentally friendly mass production at low cost. It is also expected that nanotechnology will prove to be useful in the development of light and strong materials, biomedical materials pharmaceutical materials and multifunctional intelligent materials. Many important nanostructures are composed of the group IV elements Si or Ge, type III-V semiconducting compounds such as Ga As, or type II-VI semiconducting materials such as CdS, CdSe, so these semiconductors materials will be used to illustrate some of the bulk properties that become modified with incorporation into nano-structures.

A new semi organic nonlinear optical crystal, L-Alanine potassium nitrate has been synthesized and good optical quality single crystals were grown by slow evaporation technique. The growth conditions of the crystals are studied and the grown crystals are confirmed by powder X-ray diffraction studies. The grown crystal was characterized by using powderedXRD, FT-IR, UV–Vis–NIR, EDAX, and TG–DTA. The sharp peaks from powdered XRD spectrum shows high crystalinity of the grown crystal. The presence of various functional groups was confirmed by FT-IR spectroscopic technique. The UV–Vis–NIR spectrum indicates that the crystal has very good absorption in the entire visible and near IR region spectrum suggesting the suitability of the material for NLO applications. The decomposition temperatures and mass loss have been estimated from the thermo gravimetric analysis. The presence of potassium in the compound and composition of grown crystals was confirmed on the basis of energy dispersive analysis of X-ray (EDX).

[Ni(L4)2Cl2], were prepared by reacting 2,3,4-trimethoxy benzaldehyde semicarbazone ligands with NiCl2.6H2O. The IR,UV, Mass and 1H NMR spectra of the complexes have been assigned. Thermo gravimetric analysis were also carried out. The data agree quite well with the proposed structures and show that the complexes were finally decomposed to the corresponding ligands. Complexes were screened for antimicrobial activities by the disc diffusion technique using DMSO as solvent. The activity data show that the semicarbazone metal complexes are more potent antimicrobials metal complexes.

The present work is concerned with the synthesis and the structural elucidation of the two ligands, viz., 2-thio picolinamide (TPA) and 2-N-benzyl TPA. The isolated solid complexes are subjected to characterised by Wet chemical analysis (N, S, metal), Conductivity measurements, Infrared including far infrared spectral measurements and H¹ NMR, and Mass spectral measurements.

A number of 5-Phenyl-1,2,4-triazolo[4,3-a]-quinazolin-6-ones(3), 3-(2,4-dichlorophenoxymethyl)-1,2,4-triazolo-[4,3-a]-quinazolin-6-ones(4) and 5-phenyl-3-mercapto - 1,2,4-triazolo-[4,3-a] -quinazolin-6-ones (5). These title compounds have been prepared by reaction of 2-hydrazino-3-phenyl-4-quinazolone (2) with formic acid, methoxy phenyl acetic acids and carbon disulphide respectively. These compounds have been evaluated for their fungicidal activity against Pyricularia oryzae, Pseudopernospora cubensis, Sphaeotheca fuliginea and Phytopthora infestans at 500 and 100 ppm.

The main objective of the research presented herein was to developed poly(dodecyl phenol formaldehyde)-b-poly(oxypropylene) block copolymer for asphaltene precipitation problem and performance of some asphaltene inhibitors\dispersant for a heavy crude oil provided by the Hossia crude oil (Ras Gharib – Egyptian Eastern desert). The dispersants/inhibitors was synthesized in tow steps; 1) synthesis of poly(dodecyl phenol formaldehyde) resin (PDPF) at three different molecular weights (1936, 4047 and 8092) namely PDPF1, PDPF2 and PDPF3 respectively; 2) propoxylation of the prepared compounds to produce PDPF1-b-POP, PDPF2-b-POP and PDPF3-b-POP has molecular weight (3096, 5179 and 9202) respectively. All of the synthesized compounds were evaluated as asphaltene inhibitors/dispersants at 100, 500 and 1000 ppm using UV spectrophotometer. The molecular weights were determined by GPC. The chemical structure of the prepared compounds was confirmed by IR and H1NMR. The crude oil was analyzed by GC. The results also revealed distinct inhibition of asphaltene precipitation in crude oils.

Recently, the synthesis of 2-hydroxybenzoinhydrazone, 2-hydroxybenzoinphenylhydrazone and 2-hydroxybenzoinsemicarbazone with hydrazine hydrate, phenyl hydrazine and semicarbazide hydrochloride in presence of aqueous sodium hydroxide in DMF-water (80%) medium respectively. Similarly, furoinhydrazone, furoinphenylhydrazone, furoinsemicarbazone were synthesized by the interactions of furoinbenzoin with hydrazine hydrate, phenyl hydrazine and semicarbazide hydrochloride in presence of aqueous sodium hydroxide in DMF-water (80%) medium respectively. The synthesis of 2-hydroxybenzoin and furoinbenzoin were carried out by the known literature method. The structure of all the synthesized compounds were justified on the basis of chemical characteristics, elemental and I.R. and NMR spectral analysis.Benzoin hydrazone and its metal complexes were synthesized from substituted benzoinhydrazone. They were characterized by elemental analysis and spectral analysis. The synthesized complexes were screened for antimicrobial activity. At a concentration of 1000µgm/ml. Which was serially diluted to determine their MIC value .