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Volume 6, No. 3, September 2011, Shawwal 1432 H 

Review

 

 

New Materials and Chemistry: Small Molecules Great Progress

The chemical and physical properties of a series of metal carboxylates of type [LnMO2CR] and [LnMO2CCO2MLn] (M = Cu, Ag; L = 2-electron donor; R = single bonded organic group; n = 1, 2, 3) is discussed. Their use as precursors in metallization processes applying CVD, ALD, CCVD, spin-coating and ink-jet printing on different substrate materials is reported. In addition, the use of metal-organic [AgO2CCH2(OCH2CH2)nOCH3] and [(Ph3P)AuO2CCH2(OCH2CH2)nOCH3] (n = 1, 2, 3, ) for the generation and stabilization of silver and gold nanoparticles is envisaged. Colloids (Ag, Au, Fe3O4, ) are also available by using end-grafted ethylene glycol-functionalized polyamidoamine dendrimers. The usage of organometallic species including carbosilanes and silanes for the preparation of C/C- und C/C-SiC-based composite materials as well as Si-based ceramics is reported.

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Heinrich Lang

JJC, 2011, 6(3), 231-245

Articles

 

 

Indium-Mediated Allylation of N-tert-Butylsulfinylaldimines with
Dimethyl 2-[2-(Chloromethyl)allyl]malonate

The reaction of N-tert-butylsulfinylaldimines 5 with dimethyl 2-[2-(chloromethyl)allyl]malonate (10), in the presence of indium metal and sodium iodide, at room temperature for 72 hours, led to the corresponding amino ester derivative 11. The reaction preceeded in high yields in a total stereoselective fashion, a single diastereoisomer being always isolated.

 

 

 

Haythem K. Dema, Francisco Foubelo, Miguel Yus*

JJC, 2011, 6(3), 247-255

1,3-Dipolar Cycloaddition Reaction of Benzyl Azide with Cyclohex-2-en-1-one. Experimental and Computational Study

It has been found that 1,3-dipolar cycloaddition reaction of benzyl azide with cyclohex-2-en-1-one leads to the formation of 1,2,3-triazole in ethanol and at room temperature.  The isolated and purified product was characterized by spectral methods IR, 1H-NMR, 13C- NMR, Cosy, Dept-135 and MS. Ab initio calculations were carried out with the Complete Basis Set (CBS-4M) Model Chemistry of Petersson and coworkers in order to obtain very accurate energies. Geometry optimization and vibrational frequency calculations were performed on reactants, adducts, final products, and the transition states using CBS-4M model. CBS-4M begins with a HF/3-21G(d) geometry optimization. The zero point energy is computed at the same level. It then uses a large basis set SCF calculation as a base energy, and an MP2/6-31+G calculation with a CBS extrapolation to correct the energy through second order. An MP4(SDQ)/6-31+(d,p) calculation is used to approximate higher order contributions.

 

 

Thanaa Shriteh*, Sultan T. Abu-Orabi, Rushdi Madwar, Adnan Atfeh, Mohammad Abd-Al hakim Badawi

JJC, 2011, 6(3), 257-269

The Vibration Frequencies of [6] Cyclacenes (Linear, Angular and Angular-Chiral) Monoring Molecules

The (3N-6) vibration frequencies and IR-absorption intensities of [6] Cyclacene  (linear, angular and angular-chiral) monoring molecules were calculated applying Density Functional Theory (DFT) of the type (B3LYP) and a Gaussian basis (6-311G) method. Comparison of the results showed that, similar to the polyaromatic hydrocarbons, the following relations hold: nsymmetricCH str.  > nasymmetric CH str.   and, nsymmetric CC str.  > n asymmetric CC str.  i. e., the following relation hold too,nsymmetric. CC str.(axial.) > nasymmetric. CC str.(axial) > nasymmetric. CC str. (circumferential) in the linear molecule, where axial are the vertical C-Ca bonds (annular bonds) in the rings and circumferential C-Cc are the outer ring bonds.The relation for the C-Cstr. is reversed in the angular and the angular-chiral molecules, since the C-Ca bonds are converted to C-Cc bonds in the angular and angular-chiral cyclacenes. The results include the assignment of all puckering, breathing and clock-anticlockwise bending vibrations. They allow a comparative view of the charge density at the carbon atoms too

 

 

 

Rehab M. Kubba, Huda N. AL-Ani and Muthana Shanshal*

JJC, 2011, 6(3), 271-293

Synthesis and Physico-Chemical Study of Na0.5K0.65Mn3.43(AsO4)3 Compound

The title compound crystallizes in monoclinic system P21/c. The parameters of the unit cell are: a=6.856(5); b=13.070(5); c=11.370(2); β=98.63(3); V=1007.2(5)3 and Z=4. The anionic framework of the compound is built up from infinite layers linked together by Mn-As-O bridges and by edge-sharing MnO6 octahedra to form a three dimensional framework having two kinds of tunnels. The first one, containing K+ cations, is parallel to the a axis and the second one containing Na+ cations is parallel to [001] direction.

 

 

Wafa Frigui, Fatma Ben Amor, Mohamed F. Zid*, Adel Madani, Ahmed Driss

JJC, 2011, 6(3), 295-305

Removal of an Azo Dye (Orange G) By Various Methods in Homogenious Phase. Comparative Study

The best removal efficiency of orange G in homogeneous medium, was obtained by AOT's (Advanced Oxidation Technologies) methods rather than by photolysis or acetone/UV processes. The coupling of iron II with S2O82/UV led to a significant improvement of the decolourization rate.

 

 

 

 

 

     

 

 

 

 

H. Chenini , K. Djebbar*, S.M. Zendaoui, T. Sehili, B. Zouchoune

JJC, 2011, 6(3), 307-319

Some Organic Additives as Corrosion Inhibitors for
Zinc in Acetic Acid Media

Morphological investigation of zinc surface in 2M acetic acid

 

 

Hisham  J. El- Aila*, Hassan M. Tamouse,  Nabil H. Amin,  Mohamed A. El- Jboour

JJC, 2011, 6(3), 321-337

Chemical Constituents of Teucrium polium L. var. mollissimum Hand-Mazz

 A new neo-clerodane type diterpenoid, Syrapolin II (12,18-diacetoxy-15,16-diepoxy-6-oxo-neo-cleroda-13(16),14-diene-3β,7α-20β-trihydroxy-19-hemiacetal) 1, and tow known compounds 6'-O-Caffeoyl-8-O-acetylharpagide 2, clerosterol-3-O-glucoside 3, were isolated from the aerial parts of Teucrium polium L. var. mollissimum Hand-Mazz. The structure of compounds were proposed on the basis of spectroscopic methods (IR, MS, NMR), and comparison with closely related compounds.

 

Chahid Moustapha, Taher Hasen, M.Waleed, M.Sadaka

 JJC, 2011, 6(3), 339-345

The Study of Fate and Mobility of Oxytetracycline and Doxycycline in Soil Column Matrices

This figure shows concentrations (Conc.) of oxytetracycline and doxycycline solutions after addition of 50 ml of 0.005% w/v of each of prepared solutions, each with 5 grams of soil sample at different mixing times.  Equilibrium occurred after 24 hours of adsorption for both oxytetracycline HCl and doxycycline HCl.

 

 

Shehdeh Jodeh and Lama Awartani

JJC, 2011, 6(3), 347-360