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Volume 3, No. 1, March 2008, Rabia 1 1429 H

Articles

 

 

Nitrilimines in 1,3-Dipolar Cycloaddition Reactions: Synthesis of New Derivatives of Condensed 1,2,4-Triazolo- Heterocycles and Dithiatriazaspiro[4,4]non-2-enone Derivatives

C-Alkyl-N-arylnitrilimines 2 react with some containing thiourea moieties compounds 3-9, and thioxothiazolidin-4-one derivatives 10, 11. The nitrilimines 2a,b cycloadd to C=S double bond to give spiro intermediates which undergo ring cleavage to yield the 1,2,4-triazolo fused heterocycles and dithiatriaza-spiro[4,4]non-2-enone derivatives.

                                   

 

Nada M. Abunada*, Hamdi M. Hassaneen

JJC, 2008, 3(1), 1-10

Catalytic Dimerization of Propene with Bis(phenoxyimine) Ni(II) Complexes and Phosphine Ancillary Ligands

A series of 56 bis(phenoxyimine) metal (II) complexes was prepared and used as catalyst precursors for dimerization reactions of propene. The complexes were activated with methylaluminoxane (MAO) or other aluminum compounds like aluminum alkyls or aluminum halides in the presence of different phosphines. The influence of the ligand frameworks, the phosphine additives and the co-catalysts was studied.

  

 

 

 

Helmut G. Alt*, Katharina J. Schneider

JJC, 2008, 3(1), 11-32

Dinuclear Ruthenium Thiocarboxylate Complexes:
(-Z)[CpRu(L)(L')SCO] 2 (Z= 1,4-C6H4, 1,3-C6H4, (CH2)4)

Ruthenium thiocarboxylate dinuclear complexes of the general formula (m-Z)[CpRu(L)(L)SCO]2 {Cp= h5-C5H5; L= L= PPh3; 1/2 dppe; L= CO, L= PPh3, Z= 1,4-C6H4, 1,3-C6H4, (CH2)4}, were prepared directly by reacting CpRu(L)(L)SH with 1,4-ClCOC6H4COCl, 1,3-ClCOC6H4COCl and ClCO(CH2)4COCl  in THF at room temperature.

 

 

Mohammad El-khateeb*, Khalil J. Asali, Amani Rababa'ah, Muhammad A.Shaheen

JJC, 2008, 3(1), 33-37

G3-Global and -Local Minima of XC2H4+ Structural Isomers
where X = Li to Br

B3LYP/6-311+G** and G3 levels of theory reveal that cyclic and 1-substituted isomers are either global or local minima for XC2H4+ structural isomers when X is CH3 or an element of groups V, VI and VII. π-bridged structures are global minima when X is an element of groups I, II and III, SiH3 and GeH3. The large electrophilicity of C+ in substituted ethyl cations and the position of X in the periodic table are the main factors that determine the structure of the global minima.

1-Substituted

Cyclic

Global Minima

X = NH2, OH, SH, F, Cl.

Global Minima

X = PH2, AsH2, she, Br.

Local Minima

X = PH2, AsH2, SeH, Br.

Local Minima

X = NH2, OH, SH, F, Cl.

 

 

Mustafa R. Helal* and Akef T. Afaneh

JJC, 2008, 3(1), 39-55

The Effect of Applied Potential on Plasmon Resonance Bands of Nanoscopic Silver Particles Adsorbed on Transparent Electrodes

The plasmon resonance spectra of nanoscopic silver particles adsorbed on transparent semiconductor electrodes in contact with eight aqueous electrolytes (KCl, KBr, KI, NaCl, NaBr, NaI, NaClO4, and KPF6) have been examined. In all electrolytes, the plasmon resonance bands are red-shifted and decreased in intensity as the applied potential is made more positive. The degree of the potential-induced spectral changes depends on the electrolyte type and concentration.

 

Nathir A. F. Al-Rawashdeh*, Abbas I. El-Akhras, Mohammed Abbo, Mohammed O. Al-Mubarak

JJC, 2008, 3(1), 57-68

Determination of Nitrite and Nitrate in Cell Culture Medium by Reversed-Phase High-Performance Liquid Chromatography with Simultaneous UV-VIS and Fluorescence Detection

A reliable method for determination of nitrite and nitrate in cell culture medium has been developed. The method is sensitive enough to measure 0.03 M nitrite or nitrate by fluorometric detection and has a large dynamic range to measure concentrations up to 50 M nitrite or nitrate by UV-VIS detection.

Typical HPLC chromatograms for: A) nitrite analysis (20.0 M) in cell culture medium, UV-VIS multi-wavelength detection (300-400 nm); B) chromatogram A processed at 369 nm. Retention times: DAN (11.1 min) and NAT (12.4 min).

 

 

Yahya R. Tahboub*

JJC, 2008, 3(1), 69-75

Micelle Mediated Methodology for the Determination of Heavy Metals in Real Samples by Flame Atomic Absorption Spectrometry

2-amino-5-mercapto-1, 3, 5-thiadiazole (AMTD) and TritonX-114 were used as hydrophobic ligand and non-ionic surfactant    for determination Heavy metals.

 

Farshid Ahmadi*, Azadeh Khanmohammadi, Shahin Heydari, Mehdi  Mirzazadeh and Ezatallah  Malekpour

JJC, 2008, 3(1), 77-86

Sorption of Trace Metals on Fish Scales and Application for Lead and Cadmium Pre-concentration with Flame Atomic Absorption Determination

Ground fish scales were characterized as a solid phase extraction medium for pre-concentration of first row transition elements prior to their flame atomic absorption spectroscopic determination. The proposed method is capable of 47 fold enrichment of Pb and Cd from wastewaters with a detection limits of 1.2 μg l-1 and 0.6μg l-1, respectively.

 

 

Amjad H. El-Sheikh and Jamal A. Sweileh*

JJC, 2008, 3(1), 87-97

 

Overview

 

 

AL-KMIY’: From Baghdad to Al-Andalus

The Arab Contribution to the Development of Chemistry in Europe

An Overview of a Research Project

The golden age of the Ancient Arab Scientific tradition is 13-15th century. Their translations from Greek, Persian and Syrian manuscripts were enriched with   innovative research. Their innovation in Chemistry was experimental leading to the design and use of instruments and techniques. This was also important for the development of industries like perfumes, cosmetics, metallurgy, dyes, pigments and pharmacopeia. In this research Project the main goals are to seek and study documents like manuscripts of that period in the Arab Civilization related to Chemistry and Industries, their impact in Europe and to interpret them in the light of modern chemical theories.

 

 

Jardim, Maria Estela, Lagowski, J.J* and  Maia, Maria Elisa

JJC, 2008, 3(1), 99-102