European Reviews of Chemical Research

3-10

Authors: Abdelilah Benallou, Habib El Alaoui El Abdallaoui, Hocine Garmes

HCN oxidation has been conducted in oxygen atoms, whereas the higher availability of oxygen in the atmosphere increases the HCN purification. However, this study was studied theoretically using density functional theory (DFT) method. The present work aims to evaluate the oxidation behaviour of HCN emissions in O2 atmosphere. A detailed chemical kinetic mechanism for HCN combustion was evaluated. According to the proposed kinetic mechanism, in the ambient conditions, the oxidation of HCN proceeds mostly through the following sequence: HCN+O→NCO+H and CO2+NH. The present modeling shows that these oxidations are preferred kinetically and energetically and are spontaneously possible in the atmosphere.

16-21

Authors: I.A.A. Ibrahim, M. Chindo, M.M. Mohammad, A.A. Faisal, H. Musa

Stem bark sample (100g and 60g) of Ficus platyphylla were thoroughly extracted with ethanol and water respectively. The qualitative phytochemical analysis of the ethanol crude extract showed the presence of saponin, tannis, flavonoids ring, cardiac glycosides and carbohydrates, steroids ring, and Alkaloids. The qualitative was justified by their colour changes with their various reagents. The extract exhibited antimicrobial activity on E coli and S aureus. This appears to because of the secondary metabolites tested for and those present but not tested for.

30-39

Authors: H.A. Shindy

Novel polyheterocyclic cyanine dyes covering aza-cyanine dyes and bis aza-cyanine dyes derived from 3,8-diethyl-2,7-diphenyl benzo [2,3-b; , - ] bis furo[3,2-d] pyrazolium iodide quaternary salt were prepared. The electronic visible absorption spectra for all the synthesized cyanines were investigated in 95 % ethanol solution to evaluate their photosensitization/electronic transitions correlation. The cyanine dyes were thought to be better photosensitizers when they absorb the visible light to initiate the electronic transitions at higher wavelength bands (bathochromic shifted and/or red shifted dyes). Consequently, the photosensitization of the cyanine dyes decreases when they absorb the visible light to initiate the electronic transitions at lower wavelength bands (hypsochromic shifted and/or blue shifted dyes). Solvent/electronic transitions correlation study for some selected cyanine dyes were carried out in pure solvents having different polarities [water (78.54), Dimethylformamide (36.70), ethanol (24.3), chloroform (4.806), benzene (2.28) and dioxane (2.209)] to evaluate their solute/solvent interaction properties (general and/or specific solvent effects). Structural identification were confirmed using elemental analysis, visible spectra, IR and 1H NMR spectral data.