Copper (II) complexes of pyridine and picoline were characterized by infrared spectroscopy, ultraviolet spectroscopy, conductivity measurement, solubility test and melting points. The molar conductivity of the complexes in nitromethane revealed that none of the complexes was an electrolyte. The solubility test also showed that all the complexes were insoluble in petroleum ether but sparingly or soluble to some extent in methanol, ethanol methylenedichloride nitromethane and distilled water.

A study was carried out on Nature and Levels of Ambient Air Quality (AAQ) Pollution in and around a chemical fertilizer plant (NFL) at Vijaipur Distt. Guna (M.P.) India. The parameter's selected for analysing ambient air quality (AAQ) status were suspended particulate matter (SPM), sulphurdioxide (SOx), Nitrogen oxide (NOx) and NH₃ emission. The results revealed that in the industrial plant, the urea plant produced the highest ammonia emission and suspended particulates matter (SPM). Other section in the plant emitted relatively low levels of Ammonia and SPM. 

The metal-ligand and protonligand stability constant of Ce(III) and Dy(III) with substituted heterocyclic drug (Acarbose) were determined at various ionic strength by pH metric titration .NaClO₄ was used to maintain ionic strength of solution. The results obtained were, extrapolated to the zero ionic strength using an equation with one individual parameter. The thermodynamic stability constant of the complexes were also calculated.

 4-{4-(2-phenyl-4-benzylidene-5-oxo-imidazol-1-yl) phenyl}-6-(substituted phenyl)-1,2,5,6-tetrahydropyrimidin-2-thione have been prepared by the refluxation for 3 hours of 4-benzylidene-1-{4-[3-(substituted phenyl)prop-2-enoyl]phenyl}-2- phenyl -imidazol-5-one with thiourea and potassium hydroxide in presence of ethanol . The intermediate 4-benzylidene-1-{4-[3-(substituted phenyl)prop-2-enoyl]phenyl}-2- phenyl -imidazol-5-one synthesized by the condensation of 1-(4-acetylphenyl)-4-benzylidene-2- phenyl- imidazol-5-one with various aldehydes. The product is characterized by spectral and analytical data. Most of the tested compounds show promising antibacterial and antifungal activity.

Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes of the type [ML₂(NO₃)₂] and [PdL₂]Cl₂, where L is the Schiff base {2-(3-iodo-4-methyl-phenylimino)-2H-napthalene-1-one} formed by condensation of 1,2-napthadione and 3-iodo-4-methylaniline, have been prepared and characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared and electronic spectral measurements. Elemental analysis suggests the stoichiometry to be 1:2 (metal : ligand). Magnetic data coupled with electronic spectra corroborate a six coordinate octahedral structure for all the complexes, with exception of [PdL₂]Cl₂ which adopts a 4-coordinate square-planar geometry. Infrared data indicate coordination of the central metal atom through the imine N, keto O and nitrate N atoms. They are all magnetically dilute and non-electrolyte in DMF with exception of [PdL₂]Cl₂ which is a 1:2 electrolyte.

Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes of the type [ML₂(NO₃)₂] and [PdL₂]Cl₂, where L is the Schiff base {2-(3-iodo-4-methyl-phenylimino)-2H-napthalene-1-one} formed by condensation of 1,2-napthadione and 3-iodo-4-methylaniline, have been prepared and characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared and electronic spectral measurements. Elemental analysis suggests the stoichiometry to be 1:2 (metal : ligand). Magnetic data coupled with electronic spectra corroborate a six coordinate octahedral structure for all the complexes, with exception of [PdL₂]Cl₂ which adopts a 4-coordinate square-planar geometry. Infrared data indicate coordination of the central metal atom through the imine N, keto O and nitrate N atoms. They are all magnetically dilute and non-electrolyte in DMF with exception of [PdL₂]Cl₂ which is a 1:2 electrolyte.

Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes of the type [ML₂(NO₃)₂] and [PdL₂]Cl₂, where L is the Schiff base {2-(3-iodo-4-methyl-phenylimino)-2H-napthalene-1-one} formed by condensation of 1,2-napthadione and 3-iodo-4-methylaniline, have been prepared and characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared and electronic spectral measurements. Elemental analysis suggests the stoichiometry to be 1:2 (metal : ligand). Magnetic data coupled with electronic spectra corroborate a six coordinate octahedral structure for all the complexes, with exception of [PdL₂]Cl₂ which adopts a 4-coordinate square-planar geometry. Infrared data indicate coordination of the central metal atom through the imine N, keto O and nitrate N atoms. They are all magnetically dilute and non-electrolyte in DMF with exception of [PdL₂]Cl₂ which is a 1:2 electrolyte.

 Adsorption kinetics which describes the solute adsorption rate is an important characteristic in evaluating the efficiency of adsorption. The present study is aimed at studying the potential of activated carbon from the pods of wood apple in the removal of Cr (VI) from aqueous solution from its kinetic standpoint. The adsorption kinetics of Cr (VI) on both the adsorbents was found to follow first order kinetics. The values of initial rate and desorption constants (á and â) from Elovich equation shows a higher initial adsorption of Cr (VI) with increase in initial concentration and thus adsorption is found to be concentration dependent. The results of the study show that the activated carbon adsorbent prepared from pod of wood apple can be certainly used as an efficient adsorbent for Cr (VI) removal from aqueous solution.

Key word : , Chromium (VI), , , Elovich equation and Lagergren's kinetic equation.

Electrochemistry of H₂Q/Q redox species in different medium is studied by cyclic voltammetric technique. The voltammograms show single anodic and cathodic peaks except in lithium medium. The peak separation shows that it undergoes quasi reversible diffusion controlled with slow electron transfer which is the rate determining step. The reaction takes place at the pH range of 5.3 to 4.9 in chosen cationic medium. Kinetic parameter such as the rate constant and diffusion coefficients are presented. The adsorption on the electrode surface made stable modification. The cathodic peak currents is varies in the order K⁺>Li⁺ >Na⁺ and anodic peak current Li⁺>K⁺ >Na⁺ and anodic peak potential vary in the following Li⁺ >Na⁺ >K⁺ . Analytically Li⁺ is the best medium among the cationic medium chosen for the present study.

1-benzoyl-5-(substituted phenyl)-{3-[4-(2-methyl-4-benzylidene-5-oxo-imidazol-1-yl)] phenyl}-4,5-dihydropyrazol have been prepared by the reaction between 5-(substituted phenyl)-{3-[4-(2-methyl-4-benzylidene-5-oxo-imidazol-1-yl)]phenyl}-4,5 -dihydropyrazol and benzoyl chloride in presence of dry pyridine at room temperature the intermediate P-3 have been prepared by the refluxation for three hours of 4-benzylidene-1-{4-[3-(substituted phenyl)prop-2-enoyl]phenyl}-2-methyl-imidazol-5-one with hydrazine hydrate in presence of ethanol the intermediate P-2 have been synthesized by the condensation of 1-(4-acetylphenyl)-4-benzylidene-2-methyl-imidazol-5-one with various aldehydes.