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Volume 7, No. 1, March 2012, Rabia 2 1433 H

Articles

 

 

Synthesis and Crystal Structure of Thiocyanate Bridged One Dimensional Polymeric Complex of Cadmium(II)

The one-dimensional chain self-assembled coordination polymer [Cd(DMAB)2(SCN)2]n was synthesized and its crystal structure was determined by X-ray diffraction. It crystallizes in the monoclinic space group of P21/c with a = 5.8673(5) , b = 7.4615(8) , c = 25.411(2) , β = 91.9320(10), and Z = 2. Crystal structure shows that the one-dimensional chain is propagated through doubly bridging thiocyanate and DMAB acts as terminal ligand.

 

Yong-hong ZHOU*, Yu-peng TIAN

JJC, 2012, 7(1), 1-7

Microwave Assisted Synthesis, Spectroscopic, Thermal and Antimicrobial Studies of Some Transition Metal Complexes of Schiff Base Ligands Containing Thiazole Moiety

Microwave irradiation are used for carrying out chemical transformations, which are pollution free, eco-friendly, low cost and offer high yields together with simplicity in processing and handling. In the present paper, we have synthesized some new Schiff base metal complexes of Cr(III), Co(II), Ni(II) and Cu(II) derived from N-(4-chlorobenzylidene)-5-methyl-1,3-thiazol-2-amine (CBAM) and N-[4-(dimethylamino)benzylidene]-6-nitro-1,3-benzothiazol-2-amine (DBAT) by conventional as well as microwave methods. These compounds have been characterized by elemental analysis, FT-IR, FAB-mass, molar conductance, electronic spectra, ESR, magnetic susceptibility, thermal, electrical conductivity and XRD analysis. These compounds were also subjected to study their antimicrobial activity against Gram-positive bacteria; Staphylococcus aureus and Gram-negative bacteria; Escherichia coli and fungi Aspergillus niger and Candida albicans.

 

Rajendra Jain* and Anand P. Mishra

JJC, 2012, 7(1), 9-21

Synthesis of a Particular Ylide from Triethyl Phosphite along with Theoretical and Experimental Studies around its Carbon-Carbon Double Bond: Dynamic 1H NMR

Stable phosphorus ylide was obtained from a simple and efficient one-pot three-component reaction between triethyl phosphite and dimethyl acetylenedicarboxylate (DMAD) in the presence of 4,5-dihydrothiazole-2-thiol in a dry diethyl ether at ambient temperature in high yield. The 1H NMR spectrum of this compound exhibited dynamic effect that is attributed to restricted rotation around the carbon-carbon double bond. The experimental rotational energy barrier (ΔG) on the basis of 1H NMR study for the rotational interchangeable process of the two Z- and E-isomeres in ylide 4 equal to (63 2) kJ.mol-1. In addition, theoretical study was investigated on the basis of rotation around the carbon-carbon double bond using ab initio method at HF/6-31G level of theory. The theoretical rotational energy barrier (82 2) kJ.mol-1 for this interconversion was in agreement with the experimental data.

 

S. M. HabibiKhorassani*, M. Ansari Fard, M. Mohammadi, E. Aghdaei, M. Shahraki, M. Hadizadeh, N. Hazeri

JJC, 2012, 7(1), 23-31

Kinetics of Oxidation of L-Cysteine by Cobalt (III), Iron(III), and Chromium(III) Complexes of Salicylaldiminato Ligands

Kinetics of oxidation of L-cysteine by penta-coordinated Co (III), Fe(III), and Cr(III) complexes of salicylaldiminato ligands have been studied in aqueous solutions. Metal complexes of N-salicylidinecyclohexylamine, N-salicylidinisopropylaniline, N-salicylidinnaphthylamine, N-(4-sulfonitsalicylidine)cyclohexylamine, and N-(4-sulfonatesalicylidine)-2-isoprpylaniline were used in the studies. Measurements were run at constant temperature (25 C), constant ionic strength (0.20 M), and constant pH (7.0) under pseudo-first order conditions, in which the concentration of cysteine is around two orders of magnitude greater than that of metal complex. The observed rate constant was determined by following the change in absorbance of reaction mixture at a predetermined wavelength with time. Results show that the rate of oxidation depends on steric factor and the electron withdrawing / releasing ability of the ligand bound to the metal ion. It also depends on the metal center. The Co(III) complexes were found to have the highest rates due to higher reduction potential of Co(III).

 

Hamzeh  M. Abdel-Halim*, Adnan S. Abu-Surrah, Hutaf M. Baker

JJC, 2012, 7(1), 33-40

Effect of N,N,N-Tributyl-1-butanamaniuiodide on the Corrosion Inhibition of Mild Steel in Acidic Medium

                                 (a)                                 (b)                                    (c)

Highlights

     N,N,N- Tributyl-1-butanaminiuiodide has good inhibition effect for mild steel in 1M HCl

     The compound acts a mixed type inhibitor and obeys Langmuir adsorption isotherm.

     The best inhibition efficiency is 95.7% under studied conditions.

     The inhibition efficiency increases with increase in temperature.

 

Prathibha B.S*, P. Kotteeswaran, V. Bheema Raju

JJC, 2012, 7(1), 41-54

Vibration Frequencies of Perylene with Different Molecular Charges

  

                                                                        Cation                    Anion

 

 

Muthana Shanshal* and Rehab M. Kubba

JJC, 2012, 7(1), 55-71

Synthesis of New Macrocyclic Schiff Base Ligands and Investigation of their Ion Extraction Capability from Aqueous Media

 

Three new macrocyclic Schiff bases: (II) , ( IV) and (VI) containing nitrogen - oxygen donor atoms were synthesized by reaction of intermediate compounds: 1,4- bis(2-formylphenyl)-1,4-dioxabutane (I) 1,4-bis(2-formylphenyl)-1,4,7-trioxaheptane (III) and 1,10-bis(2-formylphenyl)-1,4,7,10- tetraoxadecane (V) with oxydianiline. Identification of these macrocyclic Schiff bases: 1,12-diaza-(3,4;9,10-dibenzo)-13, 21-oxydianiline-5,8-dioxacyclohenyacosine-1,11-diene(II),1,15-diaza-(3,4;12,13-dibenzo)-16,24-oxydianiline-5,8,11-trioxacyclo tetraacosine-1,14-diene(IV) and 1,18-diaza-(3,4;15,16-dibenzo)-19,27-oxydianiline-5,8,11,14-tetraoxacycloheptacosine-1,17-diene (VI) were determined by LC-MS, IR, 13C-NMR and 1H-NMR spectrometry. The liquid- liquid extraction of metal picrates such as Ag+, Cu2+ and Ni2+ from aqueous phase to organic phase was carried out using these ligands. The effect of chloroform and dichloromethane as organic solvents over the metal picrate extractions was investigated at 25 0.1OC by using atomic absorption spectrometer. The composition of extracted Ag+ complex was (2:1) (L:M) and Cu2+ complex was (1:1) (L:M) for the ligand (VI).

 

Souad Kedy*, Nadeem Almhna and Farouk Kandil*

 JJC, 2012, 7(1), 73-80

The Influence of Baking Fuel Types on the Residues of Some Heavy Metals in Jordanian Bread

The influence of different kinds of baking fuel on the residues of some heavy metals in Jordanian bread was investigated. An inductively coupled plasma-optical emission spectrometry (ICP-OES)-technique was used to determine the residues of lead, nickel, cadmium, and copper in bread samples obtained from the city of Irbid in Jordan. The samples which were from heavy oil, light oil (diesel), and electricity operated bakeries showed different levels of heavy metal residues. The bread from the electricity operated bakeries shows the lowest levels of contaminations. The average levels of residues of lead, nickel, cadmium, and copper in the bread from the electricity operated bakeries were 264.2 14.9 g/kg, 16.21 2.4 g/kg, 10.2 1.6 g/kg, and 5.3 0.8 mg/kg, respectively. It was noticed that the average of lead residue in heavy oil operated bakeries is higher than that recommended by the World Health Organization (WHO), while cadmium was found to be less than the recommended level.

 

Ahmed Alomary*, Fadel Wedian

JJC, 2012, 7(1), 81-85

Use of Charge Transfer Complex Formation Reaction in Spectrophotometric Microdetermination of Some Drugs

A spectrophotometric method is proposed for the determination of  isoniazid, mesalazine, salbutamol and thymol drugs in their pure forms and in pharmaceutical preparations, based on the charge-transfer (CT) complex formation reaction with o-chloranil as π-acceptor. Linear calibration graphs were obtained in the concentration range 1-16 and 2-20 μg ml-1 for isoniazid at 360 and 520 nm respectively, 1.25-30 μg ml-1 at 571.5 nm for mesalazine, 1.25-50 μg ml-1 for salbutamol and 2.5-80 μg ml-1 at 410 nm for thymol at room temperature. The molar absorptivity values are in the range 3460 and 14360 l.mol-1.cm-1 and the lower limit of detection limits are in the rang 0.1432-1.3164 μg ml-1 for all the studied drugs. The stoichiometry of the drug-o-chloranil complexes was found to be 1:1 except mesalazine which was found to be 1:2. No interference was observed from common pharmaceutical excipients. The procedure is characterized by its simplicity with accuracy and precision. The proposed method was applied successfully for the determination of the drugs in their pharmaceutical formulations.

 

Mohammed S.  Al-Enizzi, Theia'a N. Al-Sabha*, Thabit S. Al-Ghabsha

JJC, 2012, 7(1), 87-102

Elemental Analysis of Syrian Chamomile and Tea by Particle Induced X-ray Emission

Particle induced X-ray emission (PIXE) technique has been employed to perform elemental analysis of (Al, Br, Ca, Cu, Fe, K, Mg, Mn, P, Rb, S, Sr, and Zn). The results of analysis showed that Ca and K are the major elements in the samples. It is clear from the results that the content of Mn in tea samples (white tea and green tea) is 10 times higher than its content in chamomile samples. And the content of Fe and Zn in all samples ranged between 253 ppm and 1731 ppm and between 33 ppm and 138 ppm respectively, where the lowest content of both Fe and Zn found in tea samples. Cu has almost the same content in all samples. The contribution of some elements in these plants to the dietary recommended intake (DRI) has been evaluated.

 

Fairouz Youssef*, Hassan Ghanem, Nouman Salman, Elias Hanna Bakraji

JJC, 2012, 7(1), 103-113