Wyniki wyszukiwania - BazTech

1

Synthesis, Characterization and Catalytic Activity of Salen-type Schiff Base Polychelates

Bansod A., Aswar A.

Polish Journal of Chemistry

|

2006

|

Vol. 80, nr 10

1615-1622

EN

Polymeric complexes of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with Schiff base derived from 4,4-bis-[(salicylaldehyde-5)azo]biphenyl and 1,3-diaminopropane have been synthesized and characterized by microanalysis, IR, and electronic spectra and magnetic moment data. All these complexes are dark coloured and insoluble in water and most of the common organic solvents. Thermogravimetric analysis indicated the presence of coordinated water in complexes. The solid-state conductivity of the ligand and its polychelates was studied in the temperature range 313–413 K and chelates were found to show semiconducting behaviour. The Mn(II), Fe(II), Co(II) and Ni(II) polychelates have also been assessed for the catalytic epoxidation of styrene.

2

Schiff Base Metal Complexes of Chromium(III), Manganese(III), Iron(III), Oxovanadium(IV), Zirconium(IV) and Dioxouranium(VI)

Mandlik P., Aswar A.

Polish Journal of Chemistry

|

2003

|

Vol. 77 / nr 2

129-135

EN

The Schiff base 2,5-dihydroxyacetophenone isonicotinoyl hydrazone (H2L) has been synthesized by condensation of 2,5-dihydroxyacetophenone with isonicotinoyl hydrazide in ethanol. Metal complexes of the Schiff base were prepared from salts of Cr(III), Mn(III), Fe(III), VO(IV), Zr(IV) and UO2(VI). Characterization of the ligand and its metal complexes were carried out by elemental analysis, molar conductivity, magnetic susceptibility measurements, IR, 1H NMR, electronic and thermogravimetric analysis in air. The Schiff base behaves as flexidentate ligand and commonly coordinates through the oxygen atom of the deprotonated phenolic group and the nitrogen atom of azomethine group. The thermal data have been analyzed for the kinetic parameters by Broido and Horowitz-Metzger methods. All the compounds were also screened for their antimicrobial activity by agar cup-plate method against various organisms and the results have been compared.

3

Synthesis and physico-Chemical Characterization of Chelates Derived from 2-Hydroxy-5-methylacetophenone-S-benzyldithiocarbazate

Aswar A., Mahale R., Makode J.

Polish Journal of Chemistry

|

2000

|

Vol. 74, nr 4

469-475

EN

Chelates of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), VO(IV) and UO2)VI= with Schiff base ligand. The thermogravimetric data have been analyzed for kinetic parameters using Freeman-Carroll and Sharp-Wentworth methods.

4

Synthesis and characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) polychelates of the Schiff base derived from dihydroxydibenzoyl biphenyl and butanedionedihydrazone

Mohod R., Aswar A.

Polish Journal of Chemistry

|

1999

|

vol. 73 nr 4

599-605

EN

New coordination polychelates of manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) with the Schiff base derived from 4,4'-dihydroxydibenzoyl biphenyl and 2,3-butanedionedihydrazone have been synthesized and characterized by elemental analysis, electronic and IR spectra, magnetic susceptibility, thermal analysis and C.D. electrical conductivity. The Schiff base behaves as a dibasic, tetradentate ligand coordinating through an ONNO system and form chelates with general formula of [MLxh2O]n (where x=1 or 2). The thermogravimetric studies indicate a two stage decomposition and the presence of water molecules. Using thermal decomposition data, different kinetic and thermonynamic parameters have also been evaluated. D.C. electrical conductivity was measured over a wide range of temperature over a wide range of temperature in a pellet form. The Schiff base and its polychelates have also been tested for their antimicrobial activities.