Vol. 1 & Issue 2 ; Section A : Chemical Sciences

Date : Aug. to Oct.2011

 

Viscometric Intermolecular Interaction studies in binary liquid mixture of carbon tetrachloride with benzene and its substituted products.

K. Yadav, Anita Kumari and Santosh Kumar   

  • Abstract

    Viscosities (η ) of binary liquid mixtures of carbon tetrachloride with benzene and its substituted products viz. toluene, m‐xylene, ethyl benzene and chlorobenzene have been measured at two different temperatures 293.15 k and 303.15k. Excess volume of mixing (VE) and deviation of viscosities ( Δη ) of mixtures from ideal mole fraction law and parameter (d) as a measure of strength of intermolecular interaction between components of binary mixtures have been calculated from data of viscosities. Excess volumes have been found to be negative and positive in sign for binary mixtures of carbon tetrachloride with toluene and chlorobenzene and carbon tetrachloride with benzene, ethyl benzene and m‐xylene respectively at entire mole fraction range and at both temperatures i.e. 293.15 k and 303.15 k. On the other hand, Δη were found to be negative for binary mixtures of carbon tetrachloride with toluene, m‐xylene and chlorobenzene, except the binary mixture of carbon tetrachloride with benzene at entire mole fraction range and temperature metntioned. Positive value of excess volumes for three mixtures (carbon tetrachloride with benzene, m‐xylene and ethyl benzene) show weak intermolecular interactions between components. However, the negative value of Δη for binary mixtures of carbon tetrachloride with toluene, m‐xylene and chlorobenzene show weak interaction between components. The different average value of parameter d (dav) for different binary systems show different extent of molecularinteractions present there in. The experimental values of VE have been analyzed in the light of Flory`s theory

Synthesis and antifungal activity of some new fluorinated 1-[2-hydroxyethyl] -3-ethoxycarbonyl-5 – oxadiazolyl/triazolyl/ pyrrolylaminocarbonylmethoxy-2- methylbenz [g] indoles

Anil KumarMittal , Dharamveer Singh, SatyaprakashTripathi.

  • Abstract

    The exclusive formation of 1-[2- aryl]-3-ethoxycarbonyl-7-halo-2-methylbenz [g] indol-5- yloxyacetic acid hydrazides (5a-c) from 1-[2-aryl]-3-ethoxycarbonyl – 5- hydroxy-7-halo-2-methylbenz [g] indoles (3a-c) revealed the chemo selectivity of the C5 - ester over C3-ester towards nucleophillic attack of hydrazine hydrate. This monocarbohydrazide (5a-c) is reacted separately with CS2/KOH , acetonyl acetone and isothiocyanates to secure the desired 1-[2-aryl]-3- ethoxycarbonyl-5-(5-mercapto-1,3,4-oxadiazol-2-yl) methoxy-7-halo-2-methylbenz [g] indoles (8ac), 1-[2-aryl]-3-ethoxycarbonyl-5-(2,5-dimethylpyrrol-1-yl) aminocarbonylmethoxy-7- halo-2- methylbenz [g] indoles (9a-c) and 1-[2-aryl]-3-ethoxycarbonyl-5-(aryl1substituted thiosemicarbazinocarbonyl) methoxy-7-halo -2- methylbenz [g] indoles (6a-i). These thiosemicarbazides (6a-i) are reacted with 4% NaOH to produce the 1-[2-aryl] 5-(4-aryl1subsituted-5-mercapto-1, 2, 4-triazol-3-yl) methoxy-7-halo -2- methylbenz [g] indole-3-carboxylic acid (7a-i).Antifungal activity has been compared with Dithane M-45, a commercial fungicide for their fungi toxic action against Phytopthora infestans and Collectotricum falcatum, and the results correlated with their features.

Molecular Interaction Study of Lactose, DMF-H2O and NaCl System Using Acoustic, Viscometric and Volumetric Methods at different Temperatures

Rita Mehra and Brij Bihari Malav

  • Abstract

    Acoustic, viscometric and volumetric studies are useful for characterization of molecular interactions and to understand the effect of temperature of lactose in mixed solvent of N,Ndimethylformamide (DMF)-H2O+NaCl. Physical properties viz density (r), viscosity (η), sound speed (u) and refractive index (nD) at varying concentrations from 0.0105-0.1045 m at 298, 308 and 318 K have been determined using precalibrated bicapillary pycnometer, Ostwald’s viscometer, Abbe’s refractometer and single frequency ultrasonic interferometer at 2 MHz frequency respectively. The derived parameters like adiabatic compressibility (β), acoustic impedance (Z), absorption coefficient (α/f2), apparent molal volume (фv), apparent molal compressibility (фK), free volume (Vf), intermolecular free length (Lf), acoustical relaxation time (t ), Gibbs free energy (ΔG), internal pressure (πi), Rao’s constant (Rm), Wada’s constant (W) and molar refractivity (RD) have been determined from experimental data. All the measurements have been carried out in a thermostatically controlled water bath with circulating medium having accuracy of ±0.1ºC

Phenylboronic acid: an efficient catalyst for synthesis of 2-aryl-benzimidazole derivatives

Santosh V. Goswami, Prashant B. Thorat, Vijay N. Kadam and Sudhakar R. Bhusare

  • Abstract

    A simple and efficient method has been described for the synthesis of 2-aryl- benzimidazole derivatives from o-phenylenediamine and aromatic aldehydes using a mild phenylboronic acid as a catalyst at ambient temperature condition.

Synthesis and antibacterial activity of some synthetic compounds derived from sulphanilamide and 6 ethyl benzene- 1, 3 diol

Shipra Baluja, Ashish Patel and Sumitra Chanda

  • Abstract

    Schiff bases derived from sulphanilamide, and 6 ethyl benzene-1,3 diol were screened for antibacterial activity against various bacterial strains. Extracts of these compounds were evaluated on 5 strains i.e. E.coli, Pseudomonas aeruginosa, Proteus vulgaris, Klebsiella pneumoniae and Staphylococcus aureus. The antibacterial activity was evaluated using the Agar Ditch method. The Schiff bases synthesized were 1) 4-(1-aza-2-phenylvinyl)benzene sulphanilamide [UC1] (2) 4-[1- aza-2- (4-methoxyphenyl) vinyl] benzene sulphanilamide [UC2] (3) 4 [1-aza-2-(4- methylthiophenyl)vinyl] benzene sulfonamide [UC3] (4) 4-[1-aza-2- (4-hydroxy-3-methoxy phenyl)vinyl] benzene sulphanilamide [UC4] (5) 4-[2-aza-1-methyl-2-(4nitro phenyl)vinyl]-6- ethylbenzene-1,3-diol [UV1] (6) 4-[2-aza-2-(3,4-dimethyl phenyl) methylvinyl]-6-ethylbenzene-1,3- diol [UV2] (7) 4-[2-aza-1-methyl-2- (3-nitro phenyl) vinyl]-6-ethylbenzene-1,3-diol [UV3] (8) 4-[2- aza-1-methyl-2- (3-mehtyl phenyl)vinyl]-6-ethylbenzene-1,3-diol [UV4]. The BIOASSAYS were evaluated in one polar and one non polar (i.e., DMF and 1,4 dioxan) solvents. It is found that among UC and UV compounds, UV compounds are better than UC and UV1 and UV3 are the best while 1,4 dioxan solvent proved to be more effective than DMF. It appears that the Schiff base with 6 ethyl benzene-1,3diol as central moiety with nitro aniline as side chain both in meta and para position could be lead antibacterial templates.

Equilibrium studies of calcium (II) complexes with drug Furosemide and some amino acids

Bhimrao C. Khade, Pragati M. Deore and Sudhakar R. Ujagare

  • Abstract

    The equilibrium studies of the mixed ligands complexes of calcium (II) ion with drug Furosemide as primary ligand and the amino acids viz. leucine and phenylalanine as secondary ligand were determined pH metrically at 270C and an ionic strength of 0.1 M NaClO4 in 80% (v/v) ethanol-water medium. The calculations have been made using the stability constant of generalized species computer programmed.

Study on the atomic term symbols for f4 (M+3 free ion) configuration

P.L.Meena, 1P.K.Jain, N.Kumar and K.S.Meena and R.Goyal

  • Abstract

    The term is a particular energy state and term symbol is a label to energy state .The importance of these term symbols has been emphasized in connection with the spectral and magnetic properties of complexes and metal free ions and also provide information about the energy of atomic electrons in orbital’s and Total spin, Total orbital and grand total momenta of whole atom and electronic,configuration.Ressel-saunders (L-S) coupling and j-j coupling schemes are important schemes for determination of terms and term symbols of the atoms and ions of inner transition elements in which e lectrons are filled in a f sub-shell with azimuthal quantum number 3.In this proposed work computation is done for calculating all possible terms for f4 configurations without any long tabulation with mental exercise. In recent years a great interest is increased in the field of lanthanide and actinide. The determination of terms and term symbols for fn configuration is very difficult work since there are seven orbital’s in f-sub shell which give large number of microstates. The possible microstates and spectroscopic terms calculated for f4 configuration (ions M+3) are 1001and 47. These terms are quintets (5), triplets (9) and singlets (9).

Kinetic study on oxidation of cobalt (III) complexes of α- hydroxy acids by imidazolinium dichromate in the presence of micellar medium

B.Mohammed Nawaz, K.Subramani and Mansur Ahamed

  • 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 synchronous C‐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 CTAB enhances the rate of oxidation of a reaction much more than NaLS. Similar trends has been observed in lactato and glycolato Co(III) complexes.

Behavior of chloride and sodium contaminations in ground water

K.K. Sivakumar, M.S. Dheenadayalan, Leena Hebsibhai, T.R. Kalaivani and S. Mahalakshmi

  • Abstract

    Ground water analysis of 14 locations in Karur Taluk was carried out during 2010 to 2011 to evaluate the physicochemical characteristics of water. Water sampling was made on four seasons in the above mentioned year and analysis of water samples done by using standard methods. The result and thrust problem of high TDS results in this taluk shows that chloride concentration ranged from 36 to 2525 mg/L and sodium 25 to 900 mg/L. High sodium and chloride concentration makes the ground water unsuitable for drinking purpose. Permissible limit of chloride concentrations in excess of about 250 mg/L can give rise to detectable taste in water, but the threshold depends upon the associated cations. Consumers can, however, become accustomed to concentrations in excess of 250 mg/L. Until now no major health‐based guideline value (Indian Standard) is proposed for chloride and sodium in drinking‐water but prolong consumption is to be sensitive issue in the environment.

Electro oxidation of ethanol on to Pt loaded carbon felt surface modified by polyaniline

Abhik Chatterjee

  • Abstract

    Present paper describes the application of polyaniline ( PANI) in modification of catalytic activity of Pt loaded C‐felt electrode towards ethanol (EtOH) electro oxidation. Electro catalytic activities have been studied by cyclic voltammetry(CV) and amperometry. Electrocatalytic activity of electrodeposited platinum onto a carbon felt support was measured. The electrode surface was further modified with a very thin film of polyaniline. Electrocatalytic activity of the modified electrode is better than Pt deposited electrode. This improvement has been explained by the presence of nano pores over the thin film of polyaniline and good ethanol adsorption onto modified electrode.

Build resources against future uncertainty - A review on alternative resources in Oman

Feroz Shaik and L Nageswara Rao

  • Abstract

    Energy demand is expected to grow in the twenty‐first century as more countries seek a better quality of life for their citizens. The energy demand will be met by a global energy mix that is undergoing a transition from an energy portfolio dominated by fossil fuels to an energy portfolio that includes a range of fuel types. Fossil fuels such as coal, oil, and gas were the fuel of choice during the last half of the twentieth century. Forecasts of the twenty‐first century energy mix show a gradual transition from the current dominance of fossil fuels to a more balanced distribution of energy sources. Oman’s major source of revenue i.e. oil reserves are declining as years gone by and efforts are being implemented to diversify the Oman’s economy away from the oil sector. Technical advancement will play a major role to the mobilization of new reserves and the increase in the life time of present reserves. This paper presents a review of Oman’s fossil fuel reserves and the scope of alternative resources for Oman’s sustainable development of energy.

Thiourea - Zn2+ system as corrosion inhibitor for Carbon Steel in Marine media

M. Manivannan  and S. Rajendran

  • Abstract

    The inhibition efficiency (IE) of thiourea (TU) in controlling corrosion of carbon steel in marine media in the absence and presence of Zn2+ has been evaluated by weight loss study. 95 % IE is obtained from the formulation consisting of 200 ppm TU and 50 ppm Zn2+. It is found that the IE of TU increases by the addition of Zn2+ ion. A synergistic effect exists between TU 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+ – TU complex and Zn (OH)2. The scanning electron microscopy (SEM) study confirms the protection of carbon steel surface by strong adsorption of TU. From the results of above studies a suitable mechanism for corrosion inhibition is proposed.

  • Abstract