Search Results

You are looking at 1 - 10 of 91 items

  • Author: R. Ali x
Clear All Modify Search

Abstract

2,6,15,19-Tetrathia[7,7]paracyclophane reacts with salts of the soft acids Hg2+ , Ag+, Pt2+ and Pd2+ to give polymeric complexes which are insoluble in all common solvents. As expected, no products are obtained with hard acids like Li+, Na+, K+, Rb+ and Cs+.

Abstract

The oxidation of organic compounds by Fe(II)/H2O2 (known as Fenton’s reagent) has been known for nearly a century. Recently, this reagent has been used in wastewater treatment technology. The scope and the range of applicability of Fenton and Fenton like [Fe(M)/H202] reagents in advanced oxidation technology is reviewed and selected examples of their application are presented. The rate of oxidation and the extent of mineralization of organic pollutants with these reagents is improved significantly by irradiation with UV-visible light. The usefulness of UV-visible/ Fe(II)/H2O2 and UV-visible/Fe(III)/H202 processes are exemplified through specific applications. Still, much higher improvement in the rate of destruction of organic pollutants is achieved by replacement of Fe(II)/Fe(III) with ferrioxalate. Examples are provided indicating the superiority of the UV-visible/ferrioxalate/H202 process compared to the UV- visible/Fe(II)/H202 and UV-visible/Fe(III)/H202 processes. Finally, the ferrioxalate/H202 reagent is shown to be suitable for solar detoxification of contaminated water. Again, selected examples indicate the role that this reagent can play in the solar detoxification process.

Revolutionary Satire from Iran, 1907-1909

Two new ZnII(phen)2 complexes with trichloroacetate and acetate anions, [Zn(phen)2(CCl3COO)- (H2O)](ClO4) and [Zn(phen)2(CH3COO)](ClO4), have been synthesized and characterized by elemental analysis, IR, 1H NMR, 13C NMR spectroscopy. The single crystal X-ray data of these compounds show the Zn atoms to have six-coordinate geometry. From IR spectra and X-ray crystallography it is established that the coordination of the COO group is different for trichloroacetate and acetate. The former acts as a monodentate whereas the latter acts as a bidentate ligand.

Abstract

Already published data for the optical band gap (Eg) of thin films and nanostructured copper zinc tin sulphide (CZTS) have been reviewed and combined. The vacuum (physical) and non-vacuum (chemical) processes are focused in the study for band gap comparison. The results are accumulated for thin films and nanostructured in different tables. It is inferred from the re- view that the nanostructured material has plenty of worth by engineering the band gap for capturing the maximum photons from solar spectrum.

Lead(II) complexes with 2,2′-bipyridine (bpy) containing two different anions, [Pb(bpy)(CH3- COO)X] (X = I-, NO3 -, and ClO4 -), have been synthesized and characterized by CHN elemental analysis, IR-, 1H NMR- and 13C NMR spectroscopy. The structure of [Pb(bpy)(ClO4)(CH3COO)]n was confirmed by X-ray crystallography. The complex is a one-dimensional polymer as a result of perchlorate ligand bridging. The Pb atom has an unsymmetrical eight-coordinate geometry. The arrangement of the bpy, acetate and nitrate ligands leaves a coordination gap at the Pb(II) ion, occupied probably by a stereo-active lone pair of electrons. There is a π- π stacking interaction between the parallel aromatic rings that may be formed by influence lone pair activity

During the course of synthetic studies on gibberellins, three new derivatives (5, 6 , 10) of C19-gibberellin series have been prepared. These derivatives will be used as precursors for the biochemical preparations of plant growth regulating inhibitors.