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Volume 8, No. 4, December 2013, Safar 1435 H

Articles

 

 

Calculated Energies, Reaction Paths and Transition States of C-H Bond Cleavage in the Aromatic Molecules

 

 

 

Muthana Shanshal*, Mustafa M. Muala and  Muntadhar A. Alyassiri

JJC, 2013, 8(4), 213-224

Synthesis, Characterization and Antibacterial Activity of New Cu(II) and Zn(II) Complexes of Schiff Bases Derived from 9-H-Fluoren-9-one

Five Schiff base ligands bearing a 9-fluorenylidene unit, and their [Zn(L)Cl2] and  [Cu(L)Cl2] complexes have been synthesized and  characterized  by elemental analyses, spectral analyses (1H NMR, FTIR), molar conductivity measurements and thermo-gravimetric studies. Most of the free ligands and their complexes exhibit antibacterial activities against a number of pathogenic bacteria. The activities of metal complexes are found to be higher than those of the free ligands.

               

 

Abdulaziz M. Ajlouni*, Ibrahim Mhaidat, Waleed Al Momani, Ahmed. K. Hijazi, Ziyad A. Taha, Muaz Al Zouby

JJC, 2013, 8(4), 225-236

Conductometric Determination of the Stability Constants of the Quinolone Antibacterial Agents Levofloxacin and Sparfloxacin with Divalent Metal Ions

The stability of the metal ion complexes of the fluoroquinolone antibiotics sparfloxacin and levofloxacin with the divalent magnesium, calcium, barium and nickel perchlorates has been investigated by electrical conductivity in methanol at 25oC. Under the experimental conditions used, it was found that the metal ions interact with ligands in the zwitterionic state leading to the formation of positively charged complexes. The complexes of levofloxacin with the four metal ions are slightly more stable than those of sparfloxacin due to the differences in the substitution pattern between the two ligands. The stability of the complexes formed decreases in the order Mg2+ > Ca2+ > Ni2+ > Ba2+. The observed order of decrease of the complex stability is attributed to the variation in ionic radii between metal ions and to the nature of the interaction between the ligands and the metal ions.

 

 

 

Jamil Al-Mustafa* and Abeer Shinar

JJC, 2013, 8(4), 237-246

Cellulose Sulfuric Acid-Mediated Conversion of Aldehydes
to gem-Diacetates under Solvent-Free Conditions

An efficient and highly selective method for the conversion of aldehydes to gem-diacetates is described using cellulose sulfuric acid as a bio-supported catalyst at room temperature under solvent-free conditions. Mild reaction conditions, high yields of the products, easy procedure, short reaction time, insensitivity to air and moisture, stability, reusability and eco-friendly of the catalyst and selective acetylation of aldehydes in the presence of ketones are the main advantages of this procedure. The catalyst could be recycled at least five times.

 

 

Mehdi Fallah-Mehrjardi*, Kamal Ghanemi

JJC, 2013, 8(4), 247-252

A Simple and Sensitive Approach for Determination of Iron Impurity in Military Grade Ammonium Perchlorate

 In this work, we developed a simple and sensitive method for spectrophotometric determination of trace amounts of iron in ammonium perchlorate. The procedure is based on the reaction of Fe (II) with O-phenanthroline (O-Phen) to form colored  complex ion, followed by extraction of the complex using cloud point extraction technique (CPE) in the presence of anionic surfactants sodium dodecyl sulfate (SDS) and nonionic surfactant Triton X-114 as mixed micelle-mediated.

 

 

Ali Reza Zarei

JJC, 2013, 8(4), 253-261

Facile Route for the Synthesis and Characterization of [(-H)(-Ph2PCH2PPh2)Mo2(CO)8]and [(-H)(-Ph2PCH2PPh2)2Mo2(CO)6] -Anions, and the Crystal Structure of [Et4N][(-H)(-Ph2PCH2PPh2)2Mo2(CO)6]

 

 

R.M. El-mehdawi*, N.M. AL-Gozze, M.M. Ben Younes, F.A. Treish, S.G. Alsabri, Jrg Daniels and Johannes Beck

JJC, 2013, 8(4), 262-272