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Volume 9, No. 1, March 2014, Jumada 1  1435 H

Articles

 

 

Facile Three-Component Synthesis of 7-Arylbenzo[f]chromeno[4,3-b]chromen-6(7H)-ones Catalyzed by Potassium Phthalimide in Aqueous Media

 

 

 

Hamzeh Kiyani and Fatemeh Ghorbani

JJC, 2014, 9(1), 1-6

Synthesis, Characterization and Antimicrobial Evaluation of Bisphosphates with Bis-3-chloro-4-oxoazetidin System Derived from Optically Active Tartaric Acid

Bisphosphates of bis-3-chloro-4-oxoazetidin system were designed, synthesised and characterised by elemental analysis and IR, 1H NMR, 13C NMR, 31P NMR and mass spectral data. The novel compounds synthesised were screened against the certain bacteria and fungi. The results revealed that the title compounds with chloro, fluoro and nitro substituents (8c, 8e, 8f and 8g) have demonstrated significant antimicrobial activity. The synthesis scheme has given a potential scope for the design of promising bioactive molecules.

  

 

Bhavani Aishwarya. K. S, Jagadeeswara Rao. P, Spoorthy. Y. N, Ishrath Begum. D, Ravindranath. L. K.

JJC, 2014, 9(1), 7-23

Photodegradation of a-Tocopheryl Acetate Using Nanosecond Laser Pulses Obtained from the 4th Harmonic Output of Nd-YAG Laser

UV laser pulses, (1), of 266nm and 15nsec duration were generated by pumping KDP crystal, (2), with 1064nm output from Nd-YAG laser, (3) and used to irradiate a-tocopheryl acetate (VEA), (4). Photodegradation of VEA produced α-Tocopheryl hydroperoxide (5) as a photoproduct.

 

 

Yaser A. Yousef, Ahmed A. Alomary and Samah I. Matalka

JJC, 2014, 9(1), 24-33

Transition Metal Complexes of Allylated α-Diimines as Self-Immobilizing Catalysts for the Polymerization of Ethylene

 

A series of allylated α-diimine complexes of Ti, Zr, V, Cr, Fe, Ni, and Pd was prepared and characterized. These complexes were activated with methylaluminoxane (MAO) and tested for catalytic ethylene polymerization. The allyl groups of the ligands can self-immobilize the catalysts and prevent reactor fouling. The catalyst activities and the properties of the obtained polyethylenes are influenced by the metal center and the structure of the corresponding catalyst. The allylated α-diimine nickel catalysts showed the highest activities in the series and produced polyethylenes with higher molecular weights compared to the analogous catalysts without allyl groups. The allylated α-diimine palladium catalysts showed no activities for ethylene polymerization.

 

Complex 6g

 

 

Haif Alshammari, Helmut G. Alt

JJC, 2014, 9(1), 34-49

The Effect of Alkyl Substitution on the Extraction Properties of BTPhen Ligands for the Partitioning of Trivalent Minor Actinides and Lanthanides in Spent Nuclear Fuels

Bis-triazinylphenanthroline ligands (BTPhens), which contain additional alkyl (n-butyl and sec-butyl) groups attached to the triazine rings, have been synthesized, and the effects of this alkyl substitution on their extraction properties with Ln(III) and An(III) cations in simulated nuclear waste solutions have been studied. The speciation of n-butyl-substituted ligand (C4-BTPhen) with some trivalent lanthanide nitrates was elucidated by 1H-NMR spectroscopic titrations. These experiments have shown that the dominant species in solution were the 1:2 complexes [Ln(III)(BTPhen)2], even at higher Ln(III) concentrations, and the relative stability of 2:1 to 1:1 BTPhen-Ln(III) complexes varied with different lanthanides. As expected, sec-butyl-substituted ligand (sec-C4 BTPhen) showed higher solubility than C4-BTPhen in certain diluents. A greater separation factor (SFAm/Eu = ca. 210) was observed for sec-C4-BTPhen compared to C4-BTPhen (SFAm/Eu = ca. 125) in 1-octanol at 4 M HNO3 solutions. The greater separation factor may be due to the higher solubility of the 2:1 complex for sec-C4-BTPhen at the interface than the 1:1 complex of C4-BTPhen.

 

 

 

Ashfaq Afsar, James Westwood, Laurence M. Harwood, Michael J. Hudson, Dominic M. Laventine, Andreas Geist

JJC, 2014, 9(1), 50-58

Selective Solvent-Free Friedländer Synthesis

and Supramolecular Chemistry

of 13,14-Diphenyl-6,7-dihydrodibenzo[b,j][4,7]phenanthroline

 

 

 

 

Solhe F. Alshahateet

JJC, 2014, 9(1), 59-68