Vol. 2 & Issue 2 ; Section A : Chemical Sciences

Date : Feb. to Apr.2012


Induced Electron Transfer in Pentaamminecobalt (III) Complexes of α-Amino Acids by Mn(III)perchlorate in Micellar Medium

Subramanian Udhayavani

  • Abstract

    Oxidation of pentaamminecobalt (III) complexes of α-amino acids by Mn(III)perchlorate in micellar medium yielding nearly 100% of carbonyl compounds are ultimate products. The decrease in UV-Visible absorbance at λ=502nm for Co(III) complex corresponds to nearly 100% of the initial absorbance. The synchronous C-C bond fission and electron transfer of Co(III) centre. In addition, we have determined the micelle concentration of the surfactant-cobalt (III) complex and studied the kinetics of the complex with Mn(III)perchlorate. It has been found the rate of oxidation of Co(III) complexes of unbound and bound moieties are enhanced more in the presence of CTAB when compare to the NaLS.

Kinetic Study of the Catalytic Effect of CTAB on the Oxidative Degradation of Methyl Alcohol by N-chlorosaccharin

Sanjay K Singh, H.D.Gupta, S.S.Baghel, Saras Tiwari

  • Abstract

    The kinetic studies of the cetyltrimethylammonium bromide (CTAB) catalyzed oxidation of methyl alcohol,by N-chlorosaccharin (NCSA) has been carried out in aqueous acetic acid medium. The reaction is of the first order with respect to N-chlorosaccharin and fractional order with methyl alcohol. The rate of oxidation in the presence of CTAB is faster than in the absence of surfactant. The rate of oxidation increases with decrease in dielectric constant of the medium. The reactions are acid catalyzed and retarded by addition of saccharin. The value of rate constants observed at four different temperature were utilized to calculate the activation parameter. The oxidation product is confirmed and a possible reaction path for their formation is proposed in CTAB layer. The applicability of the Menger-Portnoy model was tested to explain the observed micellar effects.

Inhibitive action of polyvinyl alcohol – Zn (II) system in corrosion inhibition of carbon steel in Ground water

Manimaran N, Rajendran S, , Manivannan M and R. Saranya

  • Abstract

    The inhibition efficiency (IE) of Polyvinyl alcohol (PVA) in controlling corrosion of carbon steel in ground water in the absence and presence of Zn2+ has been evaluated by weight loss study. 98 % IE is obtained from the formulation consisting of 250 ppm PVA and 50 ppm Zn2+. It is found that the IE of PVA increases by the addition of Zn2+ ion. A synergistic effect exists between PVA and Zn2+. The mechanistic aspects of corrosion inhibition have been studied using polarization study. Also FTIR spectra reveal that the protective film consists of Fe2+ – PVA complex and Zn (OH)2. The scanning electron microscopy (SEM) study confirms the protection of carbon steel surface by strong adsorption of PVA. From the results of above studies a suitable mechanism for corrosion inhibition is proposed

Eigen vector analysis of copper (ii) halides

Vahidul Hasan Chaudhary, R. N. Verma, P. P. Singh

  • Abstract

    Eigen vector analysis of copper (II) halides has been made with the help of CAChe software. The analysis shows that the involvement of d orbitals in the formation of copper (II) iodide is 2.90 where as in copper (II) chloride and bromide, the contributions are 8.14 and 8.31 respectively. The order is CuI2 > CuCl2 > CuBr2. The reactivity of d orbitals of CuCl2 will accordingly be more.

Kinetics and mechanism of phosphotungstic acid catalyzed oxidation of citric acid by N-chlorosaccharin

Sanjay K. Singh, Harjeet Gujral, Raman Deep Kaur, Monika Arora, Gurpreet Kaur and H. D. Gupta

  • Abstract

    The kinetics of oxidation of citric acid (CA) with N-chlorosaccharin (NCSA) in the presence of phosphotungstic acid (PTA) has been measured at 293, 298, 303 and 308 K. The order with respect to NCSA was found to be unity while with CA and PTA was fractional. The effects of temperature, composition of solvent medium and concentration of added mineral acid on the rate of reaction were also studied. The mechanism for the catalysed oxidation is likely to proceed through the formation of a ternary complex between PTA

Study on Color Removal of Basic Dye by Potato Husk as an Adsorbent

Pooja V Shrivastava

  • Abstract

    Water pollution due to release of industrial wastewater has already become a serious problem in almost every industry using dyes to color their product. The study describes degradation ability of Potato husk powder on basic dye (Methylene blue). Experimental investigations have been made for color removal of textile waste water containing dye using batch adsorption technique and potato husk as an adsorbent . The effect of pH, temperature and amount of salt added in solution was investigated

Phase transfer catalysis: kinetics of acrylonitrile polymerization initiated by potassium peroxomonosulfate - cetylpyridinium chloride system

K. Mohammed Mustaque, S. Jayakumar and T.K. Shabee

  • Abstract

    Kinetics of phase transfer catalyst (PTC) assisted polymerization of acrylonitrile (AN) initiated by potassium peroxomonosulfate (KHSO5) – cetylpyridinium chloride (CPC) system was investigated in ethyl acetate/water system at 60ºC under N2 atmosphere and unstirred condition. The effect of varying the concentrations of AN, KHSO5, CPC, H+, and ionic strength on Rp were studied. From the study, reaction orders with respect to AN, KHSO5 and CPC were found to be 1.5, 0.5 and 1. Thermodynamic parameters such as overall activation energy (Ea), entropy of activation (ΔS#), enthalpy of activation (ΔH#) and free energy of activation (ΔG#) were calculated by conducting the reaction at different temperatures in the range 50-60ºC. Rate of the reaction was found to be unaffected by a change in the acid strength and ionic strength of the reaction medium. To account for the experimental observations, the most probable mechanism has been proposed and the rate expression was derived from it.

Peptide alkaoloids of Zizyphusjoazeiro

SwetaSingh, A.K. Pandey, Abhimnaya Yadava, Pratiksha Singh  And Jagdish P. Singh

  • Abstract

    Two cyclopeptide alkaloids, nummularine-k and Joazerine have been isolated from the root bark of Zizyphusjoazeiro and their structures were established by spectral evidences. This is the first report of these two compounds in Z. Joazeiro.Zoazerine, is a new 13- membered ring cyclopeptide alkaloid

QSAR study on non-benzodiazepine GABA receptor compounds using energy and topological Descriptors

Prabhat Kumar, Rajesh Kumar Pathak, P. P. Singh

  • Abstract

    QSAR models of 29 derivatives of 7,12‐dihydropyrido[3,2‐b][5,4b] diindoles as non‐BDZS compounds binding to GABA receptors have been developed using energy and topological descriptors heat of formation, valence connectivity index order 0, shape index order 1, solvent accessibility surface area, molar refractivity, Log P and molecular weight in different combinations. Best QSAR model possesses the value correlation coefficient 0.968504 and the value of cross‐validation coefficient 0.936827. Descriptors used in the best QSAR model are heat of formation, valence connectivity index order 0, solvent accessibility surface area and Log P. Prediction of activity of non‐benzodiazepine compounds can also be done with the help of single descriptor heat of formation because the QSAR model developed using heat of formation has the value of correlation coefficient 0.957198 and the crossvalidation coefficient 0.944832.

A facile Microwave Induced synthesis of some novel 3- [4’-(4’’-nitrophenoxy)-phenyl]-5-(substituted aryl)-2- pyrazoline-1-carboxaldehydes as potential antimicrobial agents

Priya Gothwal and Y. K. Srivastava

  • Abstract

    In the present communication, a series of some novel 3-[4’-(4’’-nitrophenoxy)-phenyl]-5-(substituted aryl)-2-pyrazoline-1-carboxaldehydes have been synthesized by the treatment of substituted 4’-(4”- nitrophenoxy) chalcones (1a-f) with hydrazine hydrate in hot formic acid under microwave irradiation in 80-85% yield with high purity. The newly synthesized compounds were confirmed by the spectral analysis and elemental data. These compounds were evaluated for their antimicrobial activities

A kinetic study on the oxidation of glycine by hexacyanoferrate(III) ions in presence of iridium nanoparticles.

Anjali Goel and Sonia Sharma

  • Abstract

    Well dispersed colloidal iridium nanoparticles stabilized with polyvinylpyrrolidone have been prepared successfully by reduction of the hexachloroiridic acid precursor. The synthesized iridium nanoparticles were characterized by XRD, TEM and XPS analysis. The catalysis by colloidal iridium nanoparticles was studied kinetically using the oxidation of glycine - hexacyanoferrate(III) reaction in alkaline medium. The colloidal iridium nanoparticles were found to be more active catalyst for oxidation of glycine. The catalytic system could be recycled and reused.

Quantum Mechanical Based Study of Coordinating Ability of Methylthioacetamide

 P. Singh, Priyanka Mishra and Jitendra Pratap Singh

  • Abstract

    It is well known fact that the bonding occurs at sulphur atom in thioamides. In order to prove this fact we have considered methylthioacetamide and calculated eigen values and eigen vectors using Cache software. With the help of eigen vectors, the concentrations of electrons on sulphur and nitrogen atoms of methylthioacetamide have been calculated. The sum of contributions of dorbitals of sulphur atom in the formation of molecular orbitals is smaller as compared to p-orbitals of nitrogen atom. This indicates that the bonding takes place at sulphur atom.

Pyrazoline-Piperazine merged Compounds: Synthesis, spectral analysis and antibacterial evaluation

Kokila Parmar, Jayendra Singh Vihol, Yogesh Dabhi, and Viral Modi

  • Abstract

    Ten new flurine-containing 2-[4-(4-flourophenyl) piparazine-1-yl-methyl]-3,5-substituted phenylpyrazoline (3a-j) have been synthesized in 80-85% yield by a condensation of various chalcones with hydrazine hydrate. The structures of the synthesized compounds were confirmed by UV, IR, 1H NMR and Mass spectral data. The Compounds were evaluated for in vitro antibacterial activity.

Density, viscosity, surface tension, and refractive indices of ternary liquid mixtures

S. D. Deosarkar, H. G. Jahagirdar, S. D. Wagh and P. P. Patil

  • Abstract

    In present paper density (r), viscosity (h), surface tension (g) and refractive index (nD) of ternary liquid mixtures, viz. ethanol-water-acetone and acetone-dichloromethane-ethyl acetate have been determined for varying mole fractions of solvent components at 304 K. Molar refraction of these solutions was calculated from measured refractive indices. The results have been discussed in terms of intermolecular interactions and structural properties of ternary liquid mixtures.

The Comparative study in kinetic, thermodynamic and ionic strength: On the adsorption of Copper (II) by different low cost materials

Abdo Taher, Mazahar Farooqui and Maqdoom Farooqui

  • Abstract

    The low cost adsorbent namely, a Cassia Siamea (CS), Albizia Labbeck (AL), Nerium Indicum (NI), Durauta Erecta (DE), and Potato Husk (PH) have been tested for the effectiveness on removal of copper (Cu (II)) by an adsorption technique. The various parameters such as contact time and temperature were applied for the study. The equilibrium was attained within 50 min, the adsorption was studied in the pH 5, adsorbate concentration 150 ppm and amount of adsorbent 0.2 gm. Adsorption was carried out at different temperature in the range of 293 to 333.  . It was observed that the adsorption increase with increasing in time. The kinetic data was fitted using both Pseudo –first order model and second order model, Langmuir and Freundlich models were often used to describe equilibrium adsorption isotherms and the thermodynamic parameters, change in enthalpy (ΔH) (KJ/mol) and change in entropy (ΔS) (J/mol) which related to the Gibbs free energy (ΔG).

Induced electron transfer reaction of Cobalt (III) complexes by imidazolinium dichromate in the presence of surfactant medium

B.Mohammed Nawaz K.Subramani and A.Nazim Ahmed

  • Abstract

    The kinetics of one electron transfer route seems to be unavailable for IDC with Cobalt (III) bound and unbound complexes of α-hydroxyacid in micellar medium, IDC oxidizes Cobalt(III) bound and unbound α-hydroxyacids. It rules out the synchronousC-C bond fission and electron transfer to Cobalt (III) centre. Oxidation of above complexes increases with increase of temperature. With increase in micellar concentration an increase in the rate is observed. The added TTAB enhances the rate of oxidation of a reaction much more than NaLS. Similar trends has been observed in lactato and glycolato Co (III) complexes

Synthesis and spectral investigations of binuclear Schiff base metal complexes derived from 1, 5-diaminonaphthalene

Markandan Usharani, Ekamparam Akila and Rangappan Rajavel

  • Abstract

    A series of binuclear Schiff base metal complexes of Cu(II), Co(II) and Ni(II) have been synthesized with Schiff base derived from 1,5-diaminonaphthalene, glyoxal/ biacetyl and 2-aminophenol.The structure of the ligands and its complexes were characterized through physico-chemical studies. The molar conductance value of bivalent metal complexes in DMF indicates the non-electrolytic in nature. In IR spectra, the comparison of shift in frequency of the complexes with the ligand reveals the coordination of donor atoms to the metal atom. The d-d transition of the metal complex provides information about the geometry of the complexes and the transitions are in good agreement for the proposed square pyramidal geometry for all the binuclear complexes. The ESR spectra provide further information to confirm the binuclear structure and the presence of magnetic interactions. The Schiff bases and their complexes have been screened for their in vitro antibacterial (staphylococcus aureus, bacillus subtilis, Eschericia coli and Klebsilla pneumonia) activity by paper disc method, it result confirms the binuclear complexes are more potent than free ligands

Synthesis and characterization of some substituted pentachloroethanesulfenamide

Ahcène BOUREGHDA, Ferhat BOUCHOUL and Abdelkader BOUCHOUL

  • Abstract

    In the present study substituted pentachloroethanesulfenamidewereprepared from pentachloroethanesulfenyle chloride and appropriate amines. As well the condensation of N-sulfenylpentachloroethanesulfenamideand N-thiosulfenylpentachloroethanesulfenamide afford thiobispentachloroethanesulfenamide. The synthesized compounds were analyzed and identified by the usual spectrometric methods: IR, UV-visible, NMR, MS and elemental analysis. The sterereo chemical characteristics were discussed and interpreted

Synthesis of fluorine containing 1, 3, 4-oxadiazole derivatives as potential antifungal agents

Anil Kumar Mittal, Dharm Veer Singh, Satyaprakash Tripathi

  • Abstract

    The synthesis of a number of 1, 3, 4-oxadiazole derivatives have been described 2, 4-Dichloro-sfluorobenzoyl hydrazine (1) on reacting with aromatic acids in presence of phosphorus oxychloride affords 5,2-Disubstituted-1, 3, 4-oxadiazoles or 2-Aroyl-5-(2,4-dichloro-5-fluorophenyl)-1,3,4-adiazoles (2 a-i). Aroyl hydrazine on reacting with carbon disulphide under basic condition gives 5-(2, 4-Dichloro- 5-fluorophenyl)-1, 3, 4-oxadiazol-2-thione (3). Oxadiazol-2-thiones (3) are regioselectively aminomethylated to give 3-(substituted methylamino)-5-(2, 4-dichloro-5-fluorphenyl)-1, 3, 4- oxadiazol-2-thiones (4 a-i). Further, compounds (3) undergoes regioselective alkylation on treating with alkyl / aroyl halides to give 2-Thioaryl-5-(2, 4-dichloro-5-fluorophenyl)-1, 3, 4-oxadiazoles (5 a-i). Antifungal activity has been compared with Dithane M-45. A commercial fungicide, for their fungitoxic action against Phytopthora infestance and Collectotricum falcatum, and the result correlated with their structural features

Antimicrobial activity, Spectral studies and CMCndetermination of some Surfactant-Copper (II) complexes

K. Sasikala and S. Arunachalam

  • Abstract

    Some novel surfactant-copper(II) coordination complexes, [Cu(phen)2(C16H33NH2)](ClO4)2 (A) and [Cu(phen)2(C12H25NH2)](ClO4)2 (B (phen = 1,10-phenanthroline) were synthesized from the corresponding halogeno complex by ligand substitution method. The critical micelle concentration (CMC) values of these surfactant metal complexes in aqueous solution were obtained using conductivity method. The surfactant–copper (II) complexes were screened for their antibacterial and antifungal activities against various microorganisms. The results were compared with the standard drugs, Ciprofloxacin and Nystatin respectively

Synthesis and characterization studies of a bivalent metal chelate

Suman Malik and Jaishree Morey

  • Abstract

    The synthesis of a hetero-chelate of the type ML2.2H2O has been reported here. The metal complex of Co(II) Complex has been synthesized with 6-(difluoromethoxy)-2-[(3,4-dimethoxypyridin-2-nyl)methylsulfinyl]-1H-benzo[d]imidazole(Pantoprazole). Pantoprazole is a proton pump inhibitor (PPI) drug that inhibits gastric acid secretion. Proton pump inhibitors (or PPI) are a group of drugs whose main action is a pronounced and long-lasting reduction of gastric acid production. Conductometric titrations have suggested metal-ligand ratio of 1:2 for Co(II) complex. The ligand behaves as a bidentate with N, O donor atoms. Complexes have been synthesized and characterized by elemental analysis, UV-visible and IR spectral studies.

  • Abstract