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Volume 5, No. 4, December 2010, Muharram  1432 H

Articles

 

 

Synthesis and Supramolecularity of Non-Centrosymmetric Proton Transfer Compound 2-Aminopyridinum Picolinoate

The proton-transfer compound 1 was prepared by mixing equimolar amounts of picolinic acid with 2-aminopyridine. Its crystal structure was determined by single-crystal X-ray diffraction. Compound 1 was ionic, with proton transfer occurring to the aromatic nitrogen of the 2-aminopyridine moiety. Supramolecular synthons including different motifs of hydrogen bonding, ion-pairing interactions, and non-centrosymmetric heteromer existed in the crystal structure were carefully investigated and presented in term of crystal engineering and host-guest chemistry.

 

 

Solhe F. Alshahateet

JJC, 2010, 5(4), 317-324

Synthesis, Study and Characterization of some 1,2,3-Triazolo-1,3,4-Oxadiazole Derivatives via Dehydration Reactions of Carbohydrazides

Tetrakis carbohydrazides 3a-c and 4a-b result from reaction of hydrazinocarbonyls 1 and 2 with four equivalents of aroyl chlorides. Compounds 3a-c and 4a-b were treated with phosphorus oxychloride to induce cyclisation and dehydration to the desired 1,3,4-oxadiazoles 5a-c and 6a-b

 

 

Sultan T. Abu-Orabi*, Nuha A. Abu-Naaj and Lo’ay Al-Momani

JJC, 2010, 5(4), 325-330

Synthesis and Antibacterial Activity of 3-Chloro-1-[(2-hydroxynaphthalen-1-yl) (substituted phenyl)methyl]-4-substituted Phenylazetidin-2-ones Under Microwave Irradiation

A series of 3-chloro-1-[(2-hydroxynaphthalen-1-yl)(phenyl)methyl]-4-phenylazetidin-2-ones were synthesized under microwave as well as by conventional method and evaluated for in vitro  antibacterial efficacy against : Staphylococcus aureus, Pseudomonas vulgaris, B. Subtilis, Pseudomonas Aeruginosa, and Escherichia coli,  respectively.

 

 

Vandana Tiwari, Parvez Ali, Jyotsna Meshram*

JJC, 2010, 5(4), 331-341

Chemical Compositions of the Essential Oil from the Jordanian Medicinal Plant Dittrichia Viscosa

The chemical composition of the essential oil obtained from the aerial parts at the flowering stage of Dittrichia viscosa (L.) growing in Jordan was analyzed by gas chromatography and gas chromatography-mass spectrometry. The analysis of the essential oil led to the identification of 47 components. The main constituents were fokienol (20.87%), (E)-nerolidol (19.75%), β–Eudesm-6-en-4α-ol (5.64%), α-Vetivone (3.60%), α-Eudesmol (2.68%) and Caryophyllene oxide (2.57%).

 

 

Mahmoud A. Al-Qudah*, Hala I. Al-Jaber, Abdulraouf S. Mayyas, Sultan T. Abu-Orabi and Musa H. Abu Zarga

JJC, 2010, 5(4), 343-348

Transimination; a Synthetic Route to Mixed Ligand Schiff Base Complexes

Copper and nickel Schiff base complexes have been prepared and reacted with aqueous ammonia and some alkyl amines. Some of the reacted complexes undergo transimination reaction with a complete loss of the exchanged amine from the coordination sphere. However complexes of some tridentate Schiff bases undergo amine exchange where the eliminated amine got bonded to the metal producing new mixed Schiff base complexes.

 

 

 

Fatima Esmadi*, Tareq Irshaidat and Osama Hamadneh

JJC, 2010, 5(4), 349-361

FRAGMENT: A Collection of Scripts to Obtain Magnetic Exchange, Electron Transfer and Orbital Energy on Polyoxometalates

A new computer program called FRAGMENT has been designed to help MOLCAS users in the task of preparing the input files for spectroscopic calculations on embedded fragments of magnetic molecules. FRAGMENT is built as a collection of bash shell scripts (FRAGMENTador and FRAGMENTazor) and can execute the following operations: (a) read atomic coordinate files of complex molecules and largely automate the preparation of a large variety of molecular fragments; (b) perform Bond Valence Sum calculations, (c) prepare POV-Ray files for raytracing representations of said fragments and (d) extract all in-fragment angles and distances of possible magnetostructural meaning; (e) manage different programs (seward, scf, rasscf) of the MOLCAS chain, including (f) preparing the input for the seward program, (g) checking the convergence of scf and rasscf programs, (h) automatically preparing inputs with different spin multiplicity for calculating magnetic exchange, electron transfer and orbital energy differences and (i) calculate said parameters from the results. FRAGMENT has already been applied for the investigation of a mixed-valence polyoxometalate with interest in molecular magnetism and quantum computing.

 

Murad A. AlDamen

JJC, 2010, 5(4), 363-370

Chemical and Electrochemical Techniques for Evaluation of Performance of some Amino Acids as Corrosion Inhibitors for Low Alloy ASTM A213 Grade T22 Boiler Steel in HCl Solutions

In this work, chemical (weight loss) and electrochemical (Tafel extrapolation and EFM) methods were employed for investigation of the corrosion inhibition of low alloy ASTM A213 grade T22 boiler steel in aerated stagnant 0.50 M HCl solutions at different temperatures (283-333 K) by some amino acids. The investigated amino acids were serine (Ser), therionine (Thr) and glutamine (Glu). Tafel plots showed that the three tested amino acids function mainly as cathodic-type inhibitors. The inhibition efficiency increased with increase in inhibitor concentration but decreased with temperature, suggesting the occurrence of physical adsorption. Among the tested inhibitors, Glu presented the highest inhibition performance. The inhibition process was attributed to the formation of an adsorbed film on the metal surface that protects the metal against corrosive agents. XPS examinations of the electrode surface confirmed the existence of such adsorbed film. Activation energies (Eoa) have been calculated in the absence and presence of various concentrations of these amino acids by measuring the temperature dependence of the corrosion rate obtained from weight-loss and Tafel extrapolation methods. It was found that the activation energy in the presence of the tested inhibitor is higher than that in bare HCl solution. The adsorptive behaviour of the three tested amino acids followed Temkin-type isotherm. Values of the standard free energy of adsorption (ΔGoads) of the tested inhibitors were found to be lower than -40 kJ mol-1. These results confirmed the occurrence of physical adsorption.

 

 

 

Mohammed A. Amin*

JJC, 2010, 5(4), 371-388

Determination of Ubiquinone,10 in Ten Different Sorts of Iraqi dates "Phoenix dactylefra" at Different Stages of Fruit Maturation

The saponification extraction method was applied for the isolation and identification of CoQ10 in 10 different sorts and at 4 different maturation stages of Iraqi dates. The purification of the extract was done applying column chromatography (CC) and thin layer chromatography (TLC) as well as final recrystallization from ethanol. The identification was done applying HPLC, HPLC/MS, NMR and UV spectroscopy. It was found that, for different sorts different CoQ10 concentrations exist. The highest concentration was found for the Zahdi (most common and cheapest) sort. The relative CoQ10 content increases from the initial “hababuk- kermi” stage to the final and ripe date fruit.

 

 

Ghadah Al-Faraji and Muthana Shanshal*

JJC, 2010, 5(4), 389-400

Determination of the Optimum Conditions for the Electrocoagulation of Olive Oil Mills Wastewater (OMW) Using Aluminum Electrodes

 The effective performance of electrocoagulation (EC) technique in the treatment of olive mill wastewater (OMW) has been investigated using aluminum electrodes. The electrocoagulation progress was followed by the measurement of COD, turbidity, color, suspended solids, pH, height of liquor, TDS, electric conductivity, electrode and energy consumption, temperature and the quantity of electricity used. The effects of operating parameters such as current density, initial pH, electrolysis time, and distance between electrodes (D), on COD removal efficiency have been investigated. It has been shown that the removal efficiency of COD increased with the increasing applied current density and coagulation time. The obtained results of treatment of OMW, showed that the effectiveness of the reduction of COD and color by electrocoagulation increased with time and D at a constant current density (i=23.55 mA/cm2), the effectiveness of treatment was also increased with decreasing D at a constant voltage (U=15 Volt). It was Found during the evaluation of results obtained in both cases that the optimal distance between the electrodes is D=1.5 cm, and the optimal time of treatment is t=30 min, and the best current intensity is I=4 A, equivalent to a current density i=31.25 mA/cm2 when STotal electrode=128 cm2. Under these conditions the removal efficiency of COD, dark color, TSS, turbidity, TOC, Phenol, Tannin and lignin, Volatile acids, TIC, and TNb are 22.67, 56.1, 80, 91.31, 28.5, 11.5, 24.32, 26.7, 100 and 100 % from olive mill wastewater respectively. The BOD5 treated/BOD5 raw ratio of the electrocoagulated OMW increased to 2. The electrodes consumption was 0.168 kg Al/kg CODremoved and the specific energy consumed was 3.59 kWh/kg CODremoved.

 

 

Nofa Jomaa and Yasser Hourieh*

JJC, 2010, 5(4), 401-412