JJC Information

Author Index

Reviewer Index

Editorial Index

 
     JJC Issues 
 
 
Home
Contact Address  
Download  
JJC Issues  
Subscriptions  
Feedback
 

Common Links

Leaflet In English
Leaflet In Arabic 
Contact Address 
Customer Service 
Technical Support

 

Volume 7, No. 2, June 2012, Rajab 1433 H

Articles

 

 

Synthesis of Some New Chalcone and 4,5-Dihydro-1H-Pyrazole Derivatives as Potential Antimicrobial Agents

 

Mohammad M. Ibrahim*, Mahmoud Al-Refai, Rajab Abu-El-Halawa, Hasan Tashtoush,  Sohail Alsohaili, Mohanad Masad

JJC, 2012, 7(2), 115-123

Nicotine-Based Ionic Liquid as a Green and Recyclable Catalyst for Morita Baylis-Hillman Reaction

 

Ahmed Ali Hullio*, G.M Mastoi

JJC, 2012, 7(2), 125-139

Synthesis and Characterization of Hydroxyproline Ferrocene‑Conjugated Derivatives

 

Loay Al-Momani

JJC, 2012, 7(2), 141-155

Synthesis and Crystal Structure of a Polymeric Cobalt (II) Complex with 1,1'-(1,4-Butanediyl)bis(imidazole)

A novel self-assembled coordination polymer [Co(bbi)2(NCS)2]n (bbi = 1,1'-(1,4-butanediyl)bis(imidazole))was synthesized, and its crystal structure was determined by X-ray diffraction. Single crystal X-ray analysis reveals that the complex crystallizes in the monoclinic space group of P21/c with a = 8.9697(7) , b = 9.6720(10) , c = 14.4880(13) , and β = 90.9280(10) . The Co(II) atom lies in a slightly distorted octahedral geometry defined by six N atoms. Adjacent Co(II) atom are linked by pairs of bbi molecules, resulting in a one-dimensional polymeric structure with a double-strand chain.

链状图

 

 

Yong-Hong Zhou

JJC, 2012, 7(2), 157-162

Hydrolysis of Thallium Phthalimide. The Crystal Structure of Dimorph Polymeric Thallium(I) Complex, {Tl[(Hphthalate)]}n

Single crystals of [Tl(Hphthalate)]n, were grown by hydrolysis of thallium phthalimide during slow evaporation of an aqueous solution at room temperature, and the structure was determined by X-ray diffraction analysis. It has been characterized also by elemental analysis, NMR, and IR spectroscopy. The crystals belong to the monoclinic crystal system space group P21/c. Its crystal structure analysis reveals that there is (TlO6) six coordinate Tl atoms. The polymer {Tl[(Hphthalate]}n complex linked by Tl...O contacts shown as dashed lines. Connected atoms are presented as balls and hydrogen atoms omitted for clarity. In addition, the coordination geometry of Tl+ may be influenced by its stereochemically active lone pair. The complex is linked via intermolecular O-HO hydrogen bonding.

 

Qutaiba Abu-Salem*, Eyad Mallah, Farouq F. Said, Basem F. Ali, Manfred Steinmann, Wolfgang Voelter

JJC, 2012, 7(2), 163-172

Ab Initio Investigations of the Rearrangements of Some
Sodium β-Halo alkoxides via G3 Calculations

G3 conformational analysis of anhydrous and hydrated sodium β-haloalkoxides reveals that the g+ and g- conformers are more stable than the anti one by about 6-7 kcal/mol. The transition State, TS g+, g- requires less activation energy than those necessary for the formation of TS g+, anti and TS g-, anti. The possible rearrangement for the anti conformers is the formation of the epoxides with an intra-molecular SN2 mechanism. These rearrangements are not feasible as those for the free alkoxides because the oxygen of the free alkoxides has almost a complete negative charge. The rearrangements of g+ and g- conformers to carbonyl compounds are feasible via SN1 mechanism through the formation of either Me- or H-bridged carbocations depending on the structure of the substrate. Me-bridged TS requires higher activation energy. The presence of water in the hydrated alkoxides has approximately no effect on the conformational Eact values. However, the presence of water increases the Eact values for the rearrangement processes by about 2-3 kcal/mol.  The obtained results lead to a conclusion that the preferred conformers are g+ and g- ones and their rearrangements  to carbonyl compounds are the most likely to take place either in anhydrous or hydrated sodium β-haloalkoxides.

                                          g+                        g-                          anti

 

 

Mustafa R. Helal, Khamis A. Abbas, Tahani A. Al-Qudah

JJC, 2012, 7(2), 173-190

Electrochemical Behaviour of Antioxidants: Part 2. Electrochemical Oxidation Mechanism of Quercetin at Glassy Carbon Electrode Modified with Multi-Wall Carbon Nanotubes; a Voltammetric and Chronocoulometric Study

The electrochemical oxidation mechanism of quercetin at glassy carbon electrode modified with multi-wall carbon nanotubes in aqueous 0.2 M phosphate solutions with different pH values was studied using cyclic voltammetry and the double potential step chronocoulometric method. It was found that the oxidation proceeds in sequential steps, related to the five hydroxyl groups in the three aromatic rings. The oxidation mechanism was deduced by matching the experimental chronocoulometric charge ratio versus the logarithm of duration time plots to the theoretical working curves for  different electrode mechanisms. It was concluded that the electrode reaction follows an "ECEC, first-order" mechanism. The proposed mechanism was confirmed by digital simulation using DigSim 3 software. The simulation was performed by comparing the simulated responses with the experimental ones. The homogeneous and heterogeneous kinetic parameters of the electrode reaction are estimated from the simulated data. Furthermore, it was found that, quercetin is strongly adsorbed on the electrode surface.

 

 

Refat Abdel-Hamid*, Mostafa K. Rabia, Emad F. Newair

 JJC, 2012, 7(2), 191-201

Simultaneous Preconcentration of Oxyfluorfen and Chlorpyrifos in Environmental Water Samples Using Spent Coffee Grounds as SPE Sorbents

A new procedure for the simultaneous determination of Oxyfluorfen and Chlorpyrifos pesticides in environmental aqueous samples was developed. It was based on solid-phase extraction (SPE) using spent coffee grounds (a residue from soluble coffee industry and/or coffee shops) as sorbents and high-performance liquid chromatography-ultraviolet detector for the enrichment and determination of the two pesticides at trace level. Some parameters that influence the enrichment efficiency of spent coffee grounds towards those pesticides, such as eluent type and its volume, pH of the water sample, volume of the water sample,  mass of the sorbent, and column regeneration were investigated and optimized in detail.

 

Ismail I. Fasfous*, Suha E. Rehan, Jamal N. Dawoud

JJC, 2012, 7(2), 203-220

Understanding Complexation and Desorption of Copper Ion in Three Contaminated Soil Types in Palestine Using Series of Different Surfactants and Ligands

In this study we have investigated the efficiency of surfactants and ligands on cleaning artificially contaminated red, sandy and white chalk soil samples from copper ion. Various concentrations of four different surfactants: Triton, X-100, SDS, Tergitol and Tween 80 were used as washing solution for remediation of contaminated soils. Different concentrations of three different ligands (I- , SCN- and EDTA) along with nonionic surfactant, Triton X-100, were applied as soil washing agents to desorb copper from artificially contaminated soils.

 

 

Shehdeh Jodeh*, Ahmad A.Abu-Obaid, Radi Salim

JJC, 2012, 7(2), 221-229