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Indian Journal of Chemistry

Sect. A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical

 

 

 

VOLUME 43A

NUMBER 7

July 2004

 CONTENTS

Papers

 1369

 

QSPR with TAU indices: Boiling points of sulfides and thiols

 

 

 

 

 

 

 

 

 

 

 

Kunal Roy* & Achintya Saha

 

 

The boiling points  of 26 thiols and 45 sulfides with different TAU indices, (T, TR, F, B, NV, NP, NI, NX, NY)  have been correlated in order to explore the utility of the TAU indices in modeling studies. Statistical quality of the relations has been judged by  parameters such as predicted variance, explained variance, correlation coefficient, variance ratio, etc. The study shows that the TAU indices can explain up to 99.7% and predict up to 99.6% of the variance of boiling points of the combined data set. The TAU indices can decode specific contributions of molecular bulk, functionality, branching and shape parameters to the boiling points of thiols and sulfides.

 

 1377

Electron spin resonance spectroscopy and electrical conductivity studies on some polyaniline salts and their bases

 

 

 

 

 

Palle Swapna Rao & D N Sathyanarayana*

 

 Four different polyaniline salts have been prepared by chemical oxidative polymerization of aniline with benzoyl peroxide as oxidant employing inverse emulsion method at ambient temperature using HCl, H2SO4, H3PO4 and sulphosalicylic acid. Their corresponding bases have been obtained by dedoping the salts with aqueous ammonium hydroxide.. Temperature dependent EPR studies reveal Curie - Weiss and thermally activated paramagnetism for the polyaniline salts.

 1385

 Diatomic potential energy function for helium

  

 

 

 

 

 

 

Elaheh K Goharshadi* & Mohsen Abbaspour

 

 

The diatomic potential energy function for helium has been determined via the inversion of reduced viscosity collision integrals at corresponding states and zero pressure. The viscosity, self-diffusion and thermal conductivity coefficients of helium at different temperatures and pressures have been calculated and compared with experimental data. The second virial coefficient of helium has also been calculated using the potential at different temperatures.

 1393

 

 Thermal decomposition kinetics of some aniline complexes of zinc group metals

 

 

 

 

 

 

 

T S Sikha & P Indrasenan*

 

 The kinetics and mechanism of thermal decomposition of aniline complexes of zinc group metals have been studied using non-isothermal thermogravimetry. Kinetic parameters have been calculated for each of the decomposition stages using the Coats-Redfern equation. The rate controlling processes are found to be either random nucleation with the formation of one nucleus on each or phase boundary reaction with cylindrical symmetry or spherical symmetry.

 1403

 Synthesis, crystal structure and magnetic properties of cyanide bridged 2D coordination polymers [Mn(salen)]2[Fe(CN)5NO] and [Mn(salen)]2[Ni(CN)4]

 Nizamuddin Shaikh, Anangamohan Panja, Sanchita Goswami, Pradyot Banerjee*,
Maria Kubiak, Zbigniew Ciunik,
Malgorzata Puchalska & Janina Legendziewicz

 

 

 1409

 pH dependent axial ligation of alkyl(aquo)- cobaloximes by amines: Synthesis, isolation and characterization of alkyl(ligand)cobaloximes

 

 

 

 

 

M Bhoopal & S Satyanarayana*

 

 

 Equilibria of the axial ligation of methyl and ethyl(aquo)cobaloximes by methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, cyclopentylamine, cyclohexylamine, cycloheptylamine, N,N-dimethylamine and N,N-diethylamine have been measured spectrophotometrically in aqueous solutions of ionic strength 1.0 M (KCl) at 25°C as a function of pH. The order of equilibrium constants is discussed based on the basicity and steric factors.

 1417

Determination of carbamate pesticides using micellar liquid chromatography

Maria-Elisa Capella-Peiró, Devasish Bose, Abhilasha Durgbanshi, Mayte Gil-Agustí, Samuel Carda-Broch & Josep Esteve-Romero*

 

Carbaryl, methiocarb and propoxur have been rapidly determined by micellar liquid chromatography, using a C18 (250´4.0 mm) column, UV-detection (230 nm) and direct injection of the samples. The developed method has been applied to the determination of carbamates in spiked water samples (domestic tap, agricultural and waste water) at 50 ng mL-1 concentration levels.

Notes

 1423

Electrical, electronic and thermal studies on poly[(aniline)co(p-methoxyaniline)] and
poly[(o-toluidine)co(p-methoxyaniline)]

 

 

 

 

A I Yahya*, A Ahmad & F Mohammad

 

 

It has been revealed that p-methoxyaniline units could be incorporated in the polyaniline as well as in the poly
(o-toluidine) backbones. Copolymers show lower electrical conductivities than polyaniline due to the presence of –OCH3 and –CH3 groups attached to the phenyl units affecting the planarity of systems. Poly[(aniline)co(p-methoxyaniline)] has been observed to be thermally more stable whereas poly[(o-toluidine)co(p-methoxyaniline)] is less stable than polyaniline.

 1428

Alkylation of benzene with isopropanol on mixed oxides

 

Sujit R Jadhav, Nivedita S Chaubal & Manohar R Sawant*

 

 

 1431

 Ultrasonic studies on dye stain removal by surfactants

 

 

 

 

 

 V Kannappan* & R Jaya Santhi

 

 

 The ultrasonic velocities and densities have been measured for sodium lauryl sulphate, cetyl trimethyl ammonium bromide, and TritonX-100 with methyl orange in aqueous solutions in the absence and in the presence of lipase at different time intervals at 308 K and at pH 5.5.  The ultrasonic studies reveal that lipase can enhance the detergent action of surfactants.

 1434

Kinetics and mechanism of the oxidation of formic and oxalic acids by benzyltriethyl-ammonium chlorochromate

 

 

Kavita Chouhan & Pradeep K Sharma*

 

 

 

 1439

 One- and two-dimensional complexes of bismuth(III) complexes using dithiocarbamate: Synthesis and crystal structure of Bi[S2CN(C2H4)2O]2·NO3 and {Bi[S2CN(C2H4OH)2]3}2

Handong Yin*, Chuanhua Wang & Yong Wang

 

 

 1444

 Synthesis and crystal structure of bis(O,O′-diethyl dithiophosphato-S,S′) (1,10-phenanthroline-N,N′)-Iron(II): Fe(Phen)[(C2H5O)2PS2]2

 

Shusheng Zhang*, Xuemei Li, Jinli Wang &Yonghong Wen

 

 1447

 Exchange coupled dicopper(II) complexes of thiosemicarbazones

  

Anil D Naik & Vidyanand K Revankar*

 

 1454

 Synthesis, characterization and electrical conductivities of the complexes of oxovanadium(IV), iron(III), copper(II), zinc(II) and cadmium(II) with N-isonicotinoyl-N¢-
p-hydroxythiobenzhydrazine

 

N K Singh*, S K Kushawaha & M J K Thomas

 

 

 

1459

Studies on lanthanide(III) complexes with 2-(3-coumarinyl)imidazo[1,2-a] pyridine

  

 

 

 

 

 

K B Gudasi*, T R Goudar & M V Kulkarni

 

1464

 Synthesis and characterization of Mn(II), Co(II), Ni(II), Cu(II) and Zn (II) azo coumarin complexes

P P Hankare*, S R Naravane, V M Bhuse, S D Delekar & A H Jagtap

 

1468

Trace analysis of toxic heavy metals in airborne particulate matter

 

 

 

 

 

 

P K Tamrakar & K S Pitre*

 

 Toxic heavy metals at trace levels in airborne particulate matter, have been determined by direct current polarography, differential pulse polarography and differential pulse anodic stripping voltammetry. The study shows the presence of Pb2+, Cd2+, Zn2+, Fe3+ and Cu2+ metal ions in airborne particulate matter. The observed voltammetric results are compared with those obtained using AAS, and are found to be in good agreement.

 

 1472

Removal of heavy metal ions from aqueous solutions using cellulosetetraethylenepentamine [CTEPA] resin

 

A V Singh*, R. S Sindal  & Pradeep Sharma

 

 Cellulosetetraethylenepentamine [CTEPA] resin is synthesized and the distribution coefficient of Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, and Pb2+ on the  resin at different pHs has been systematically  studied.

 

Authors for correspondence are indicated by (*)

 

 

Indian Journal of Chemistry

Vol. 43A, July 2004, pp. 1369-1376

 

QSPR with TAU indices: Boiling points of sulfides and thiols

Kunal Roy* & Achintya Saha

 

The present paper attempts to correlate the boiling points (BP) of 26 thiols and 45 sulfides with different, Topochemically Arrived Unique (TAU) indices (T, TR, F, B, NV, NP, NI, NX, NY) in order to explore the utility of the TAU indices in modeling studies. Statistical quality of the relations has been judged by the parameters such as predicted variance (Q2), explained variance (Ra2), correlation coefficient (R), variance ratio (F), etc. The study shows that the TAU indices can explain up to 99.7% and predict up to 99.6% of the variance of boiling points of the combined data set. Moreover, the TAU indices can decode specific contributions of molecular bulk (size), functionality, branching and shape parameters to the boiling points of thiols and sulfides. In general, the boiling point increases with increase in bulk and decreases with increase in branching. Further the thiol functionality contributes more to the boiling point than the sulfide functionality.

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1377-1384

 

Electron spin resonance spectroscopy and electrical conductivity studies
on some polyaniline salts and their bases

Palle Swapna Rao & D N Sathyanarayana*

 

Four different polyaniline salts have been prepared by chemical oxidative polymerization of aniline with benzoyl peroxide as a novel oxidant employing inverse emulsion method at ambient temperature using different protonic acids (HCl, H2SO4, H3PO4 and sulphosalicylic acid). Their corresponding bases have been obtained by dedoping the salts with aqueous ammonium hydroxide. The polyaniline HCl salt exhibits the highest room temperature conductivity (2.31 S cm-1). Temperature dependent EPR studies reveal Curie-Weiss and thermally activated paramagnetism for the polyaniline salts. No correlation between the magnetic properties and conductivity could be found.

IPC Code: Int. Cl.7 G01J 3/06; G01R

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1385-1392

 

Diatomic potential energy function for helium

Elaheh K Goharshadi* & Mohsen Abbaspour

 

The diatomic potential energy function for helium has been determined via the inversion of reduced viscosity collision integrals at corresponding states and zero pressure. The resulting potential has been fitted to obtain an analytical form. A comparison of newly determined potential with the previously determined potentials is also included. The transport properties of helium such as viscosity, self-diffusion, and thermal conductivity coefficients at different temperatures and pressures have been calculated and compared with experimental data and they are found to be in good agreement with each other. The second virial coefficient of helium has been also calculated using the potential at different temperatures.

 

IPC Code: Int.Cl.7 C01B 23/00

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1393-1402

 

Thermal decomposition kinetics of some aniline complexes of zinc group metals

T S Sikha & P Indrasenan*

 

The kinetics and mechanism of thermal decomposition of aniline complexes of zinc group metals have been studied using non-isothermal thermogravimetry. Kinetic parameters have been calculated for each of the decomposition stages using the Coats-Redfern equation. The mechanisms of the reactions have also been found out, and the rate controlling processes are found to be either random nucleation with the formation of one nucleus on each particle (Mampel equation) or phase boundary reaction with cylindrical symmetry or spherical symmetry.

 

IPC Code: Int. Cl7. C 08G 59/70

 

 

 

Indian Journal of Chemistry

 Vol 43A, July 2004, pp.1403-1408

 

Synthesis, crystal structure and magnetic properties of cyanide bridged 2D coordination polymers [Mn(salen)]2[Fe(CN)5NO] and [Mn(salen)]2[Ni(CN)4]

Nizamuddin Shaikh, Anangamohan Panja, Sanchita Goswami, Pradyot Banerjee*, Maria Kubiak, Zbigniew Ciunik, Malgorzata Puchalska & Janina Legendziewicz

 

The synthesis, crystal structure and magnetic properties of cyanide bridged 2D coordination complexes [Mn(salen)]2[Fe(CN)5NO] 1 and [Mn(salen)]2[Ni(CN)4] 2 are reported. Complex 1 crystallizes in the orthorhombic space group Ccca (a = 20.715 (4) Å, b = 20.718 (4) Å, c = 17.131 (3) Å, a = b = g = 90°, Z = 8). Its structure displays an extended 2D neutral network formed by cyclic tetrameric [-Mn-NC-Fe-CN-]4 units. Complex 2 also crystallizes in the orthorhombic space group Ccca (a = 20.390 (4) Å, b = 20.701 (4) Å, c = 16.779 (3) Å, a = b = g = 90°, Z = 8) and shows an extended 2D neutral network formed by cyclic tetrameric [-Mn-NC-Ni–CN-]4 units. The variable temperature magnetic susceptibility studies for both the complexes have been carried out in the temperature range 2-300 K which shows very weak antiferromagnetic interaction mediated by diamagnetic [Fe(CN)5NO]2- and Ni(CN)42- ions.

 

IPC Code: Int Cl.7. C 08G 59/70; C 07F 15/02; C 07F 15/04

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1409-1416

 

pH dependent axial ligation of alkyl(aquo)cobaloximes by amines: Synthesis, isolation and characterization of alkyl(ligand)cobaloximes

M Bhoopal & S Satyanarayana*

 

Equilibria of the axial ligation of methyl and ethyl(aquo)cobaloximes by various aliphatic amines (methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, cyclopentylamine, cyclohexylamine, cycloheptylamine, N,N-dimethylamine and N,N-diethylamine) have been measured spectrophotometrically in aqueous solutions of ionic strength 1.0 M (KCl) at 25°C as a function of pH. The order of equilibrium constants is discussed based on the basicity and steric factors. In addition to above, some of the methyl and ethyl (ligand)cobaloximes have been synthesized and characterized by elemental analysis, UV, IR and 1H NMR spectra.

 

IPC Code: Int. Cl7. C 08G 59/70; C 01B 21/00

 

 

 

Indian Journal of Chemistry

 Vol. 42A, July 2004, pp. 1417-1422

 

Determination of carbamate pesticides using micellar liquid chromatography

Maria-Elisa Capella-Peiró, Devasish Bose, Abhilasha Durgbanshi,

Mayte Gil-Agustí, Samuel Carda-Broch  & Josep Esteve-Romero*

 

Carbaryl, methiocarb and propoxur, have been rapidly determined by micellar liquid chromatography, using a C18 (250´4.0 mm) column, UV-detection (230 nm) and direct injection of the samples. Sodium dodecyl sulphate (SDS), due to its shorter retention times compared to that of Brij-35, and pentanol have been chosen as surfactant and organic modifier respectively in the optimisation procedure. An interpretative optimization strategy has been used to select the optimum mobile phase, SDS 150 mM-6% (v/v) pentanol-pH 3. The analysis time is lower than 10 min. Intra and inter-day precisions are lower than 1.9% in terms of relative standard deviation. Limits of detection (3s criterion) are 0.1 ng mL-1 for carbaryl and 0.6 ng/mL for methiocarb and propoxur. Calibration is linear between the LOD and 100 mg mL-1. The developed method has been applied to the determination of carbamates in spiked water samples (domestic tap, agricultural and waste water) at 50 ng mL-1 concentration levels. The results are similar to those obtained by the Environmental Protection Agency (EPA) reference method.

 

IPC code: Int. Cl7. C07C 271/06; BOID 15/08

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1423-1427

 

Electrical, electronic and thermal studies on poly[(aniline)co(p-methoxyaniline)]
and poly[(o-toluidine)co(p-methoxyaniline)]

A I Yahya* , A Ahmad & F Mohammad

 

It has been revealed that p-methoxyaniline units could be incorporated in the polyaniline as well as in the poly(o-toluidine) backbones. Copolymers show lower electrical conductivities than polyaniline due to the presence of –OCH3 and –CH3 groups attached to the phenyl units affecting the planarity of systems. Electronic and ESR spectra are in agreement with the electrical properties of the copolymers. ESR spectra reveal that the electrical conductivity of copolymers increase with increase in DHpp, decrease in a/b ratio and decrease in ‘g’ value. Poly[(aniline)co(p-methoxyaniline)] has been observed to be thermally more stable whereas poly[(o-toluidine)co(p-methoxyaniline)] less stable than polyaniline.

 

IPC Code: Int Cl7. G01R; G01N 25/18

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1428-1430

 

Alkylation of benzene with isopropanol on mixed oxides

Sujit R Jadhav, Nivedita S Chaubal & Manohar R Sawant*

 

A comparative study of the reaction involving the vapour phase isopropylation of benzene with isopropanol over mixed oxide catalysts with spinel structure is taken up to evaluate the performance of these potential catalysts for the industrially important cumene synthesis. Their activity is compared in the temperature range 473-553 K and with two different mole ratios of benzene to isopropanol. The major product is cumene but it has been observed that at high temperature dialkylation occurs. A laboratory scale fixed bed flow reactor has been used at atmospheric pressure for the experiments.

IPC Code: Int Cl7. C07B 37/04, B01J 8/02

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1431-1433

 

Ultrasonic studies on dye stain removal by surfactants

V Kannappan* & R Jaya Santhi

 

The ultrasonic velocities (U) and densities (ρ) have been measured for three surfactants, viz sodium lauryl sulphate, cetyl trimethyl ammonium bromide, and TritonX-100 with methyl orange in aqueous solutions in the absence and in the presence of lipase at different time intervals at 308K and at pH 5.5. The dye concentration has been maintained constant (5.0´10-6m) and the concentration of the surfactant maintained to critical micelle concentration. Acoustical parameters such as adiabatic compressibility, intermolecular free length and acoustic impedance have been computed. The ultrasonic studies reveal that lipase can enhance the detergent action of surfactant.

 

IPC Code: Int. Cl7. B01J 19/10

 

 

 

Indian Journal of Chemistry

Vol 43A, July 2004, pp.1434-1438

 

Kinetics and mechanism of the oxidation of formic and oxalic acids
by benzyltriethyl ammonium chlorochromate

Kavita Chouhan & Pradeep K Sharma*

 

Kinetics and mechanism of oxidation of formic and oxalic acids by benzyltriethylammonium chlorochromate (BTEACC) have been studied in dimethyl sulphoxide. The main product of oxidation is carbon dioxide. The reaction is first order with respect to BTEACC. The reaction is acid catalysed and the acid dependence has the form: kobs = a + b[H+]. The oxidation of a‑deuterioformic acid exhibits a substantial primary kinetic isotope effect (kH/kD = 5. 36 at 298 K). The reaction has been studied in nineteen different organic solvents and solvent effect analysed using Taft's and Swain's multiparametric equations. The temperature dependence of the kinetic isotope effect indicates the presence of a symmetrical cyclic transition state in the rate determining step.

 

IPC Code: Int Cl7. C07B 37/06

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1439-1443

 

One- and two-dimensional complexes of bismuth(III) complexes using dithiocarbamate: Synthesis and crystal structure of Bi[S2CN(C2H4)2O]2·NO3 and {Bi[S2CN(C2H4OH)2]3}2

Handong Yin*, Chuanhua Wang & Yong Wang

 

Two novel bismuth(III) complexes with dithiocarbamate, Bi[S2CN(C2H4)2O]2·NO3 (1) and {Bi[S2CN(C2H4OH)2]3}2 (2) have been synthesized. Their crystal structures have been determined using X-ray single crystal diffraction. The crystal 1 belongs to triclinic with space group Pī, a=0.9083(6), b=1.0023(7), c=1.1325(8) nm, α=69.469(9)o, β=76.003(10)o, γ=66.717(10)o, Z=2, V=0.8805(10) nm3, Dc=2.246 kg/cm3, μ=10.510 mm-1, F(000)=568, R=0.0390, wR=0.0683. The crystal 2 belongs to monoclinic with space group P2(1)/c, a=1.1149(4), b=2.1274(8), c=2.2107(8) nm,β=98.325(8)o, Z=4, V=5.188(3) nm3, Dc=1.920 kg/m3, μ=7.315 mm-1, F(000)=2944, R=0.0565, wR=0.0772. In complex 1, the structure shows a distorted monocapped octahedron configuration with seven-coordination for the central Bi atom. In crystal, molecules are packed in the unit cell in one-dimensional chain structure through a Bi­O interaction between adjacent molecule. In complex 2, the Bi atoms are eight-coordinate in a coordination polyhedron that can be described as a distorted square antiprism. In crystal, the two-dimensional network structure is formed by the intermolecular H-bonding action involving the alkyl chain.

 

IPC Code: Int. Cl7. C08G 59/70; C07F 9/94

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1444-1446

 

Synthesis and crystal structure of bis(O,O¢-diethyl dithiophosphato-S,S¢) (1,10-phenanthroline-N,N¢)-Iron(II): Fe(Phen)[(C2H5O)2PS2]2

Shusheng Zhang*, Xuemei Li, Jinli Wang & Yonghong Wen

 

A new ternary complex of bis(O,O¢- diethyl dithiophosphato-S,S¢) (1,10-phenanthroline-N,N¢)-Iron(II), Fe(Phen)[(C2H5O)2PS2]2, has been synthesized and its structure is determined by X-ray crystallography. It crystallizes in the monoclinic system, space group C2/c, with cell dimensions of a = 1.5599(3), b = 1.7454(3), c = 1.0532(2) nm, β = 102.00(3)°, V = 2.8048(9) nm3, Z = 1, μ = 9.78 cm-1. The crystal structure of the title compound is composed of discrete monomeric molecules of Fe(Phen)[(C2H5O)2PS2]2. The compound has a crystallographic two-fold axis of symmetry through the metal atom and the 1,10-phenanthroline ligand. The central metal Fe(II) is six-coordinated by four S atoms from the two dtp groups and two N atoms from the 1,10-phenanthroline ligand. The iron(II) ion has a distorted octahedral geometry, with bond angles ranging from 75.58 to 172.41°. In the complex, all fourteen atoms in a phenanthroline molecule are in the same plane and two dtp groups lie above and down this plane, respectively

 

IPC Code: Inr. Cl7. C08G 59/70; C07F 15/02

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1447-1453

 

Exchange coupled dicopper(II) complexes of thiosemicarbazones

Anil D Naik & Vidyanand K Revankar*

 

A series of new binuclear coordination complexes of copper(II) with the Schiff bases derived from 2,6-diformyl-p-cresol and 4-(X-phenyl) thiosemicarbazide (where X=-H, o-CH3, m-CH3, p-CH3 , o-OCH3, m-OCH3, p-OCH3, o-Cl, m-Cl and p-Cl have been synthesized and characterized on the basis of spectral, magnetic, thermal and electrochemical studies. In line with their magnetic properties, all the complexes are EPR silent. 1H NMR spectra of metal complexes exhibit signals within a relatively narrow spectral range. Cryomagnetic investigations (77-296K) reveal a strong antiferromagnetic spin-exchange between the copper (II) ions (J based on ). The cyclic voltammogram of copper complex in the positive potential range exhibits one metal-centered reversible one-electron oxidation step.

 

IPC Code: Int. Cl.7 C07F 1/08; C07C 251/02

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1454-1458

 

Synthesis, characterization and electrical conductivities of the complexes
of oxovanadium(IV), iron(III), copper(II), zinc(II) and cadmium(II) with
N-isonicotinoyl-N¢-p-hydroxythiobenzhydrazine

N K Singh*, S K Kushawaha & M J K Thomas

 

A new potential tetradentate ligand, N-isonicotinoyl-N¢-p-hydroxy thiobenzhydrazine (H2INptbh) has been found to form complexes [M(INptbh)] (M = OVIV, CuII, ZnII), [Fe(INptbh)(acac)] by loss of two protons from the ligand whereas, [Cd(HINptbh)2] is formed by loss of one proton. The complexes have been characterized by elemental analyses, magnetic susceptibility measurements UV-Vis, IR, ESR, 1H and 13C NMR, Mössbauer and FAB mass spectral data. The room temperature ESR spectra of OVIV, FeIII and CuII complexes yield <g> values characteristic of square pyramidal, octahedral and square planar complexes, respectively. The Mössbauer spectra of [Fe(INptbh)(acac)] at room temperature and 78 K suggest the presence of high spin FeIII. The solid state electrical conductivity of the complexes are found to be low with srt in the range of 10-1-10-9 S cm-1, however the conductivities of [Fe-(INptbh)(acac)], [Cu(INptbh)], [Zn(INptbh)] and [Cd(HINptbh)2] increase as the temperature increases from 307-397 K, with a band gap of 0.12 – 0.95 eV indicating their semiconducting behaviour. Other complexes are insulators.

 

IPC Code: Int.Cl7. C08G 59/70; C07F 3/08, C07F 1/08; C07F 3/06

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1459-1463

 

Studies on lanthanide(III) complexes with 2-(3-coumarinyl)imidazo[1,2-a] pyridine

K B Gudasi*, T R Goudar & M V Kulkarni

 

New lanthanide(III) complexes with 2-(3-couma­rinyl)imidazo[1,2-a]pyridine (CIP) having the general formula [Ln(CIP)2X2]X.nH2O, (Ln = La, Ce, Nd, Sm, Gd, Dy and Y; X = NO3-1, Cl-1 and n = 3,6) have been prepared and characterized by elemental analyses, conductance measurements, magnetic susceptibilities, spectroscopic (electronic, IR, and 1H NMR) studies and thermal methods. Molar conductance studies indicate 1:1 electrolytic behaviour for these complexes. IR spectra indicate that CIP acts as a neutral bidentate ligand. TG and DTA studies of Nd(III) and Y(III) complexes indicate that they are stable up to 70°C and contain lattice held water molecules. The activation energy (Ea), pre-exponential factor (A) and entropy of activation (∆S) for the thermal decomposition of the Nd(III) complex have been computed by the Coats-Redfern equations using the least-square method for each step of decomposition. The activation energy of the thermal degradation process of Nd(III) is in the range of 4-53 kJ mol-1, which indicates that the metal-ligand bond is very weak. This indicates that the ligands are loosely bound to the metal ion through electrostatic forces, because 4f electrons shielded by the 5S2P6 octet are not available for covalent bonding. The negative values of the entropy of activation indicate that the activated complex has a more ordered structure than the reactants which might be possible through chemisorption of oxygen and other decomposition products.

 

IPC Code : Int Cl7. C08G 59/70

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp.  1464-1467

 

Synthesis and characterization of Mn(II), Co(II), Ni(II), Cu(II)
and Zn (II) azo coumarin complexes

P P Hankare*, S R Naravane, V M Bhuse, S D Delekar & A H Jagtap

 

Complexes of the composition [M(L)2 (H2O)2]. x H2O where L is deprotonated ligands like HL1 = 8-(-2-azothiazolyl-)-7-hydroxy 4-methyl coumarin and HL2 = 8-(-2-azobenzothiazolyl-)-7-hydroxy 4-methyl coumarin; M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II); x = 1 to 4 have been synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance, TGA, X-ray diffraction and spectral studies. HL1 and HL2 act as neutral bidenate ligands and the complexes appear to be octahedral. Antibacterial activities of ligands and their metal complexes have been determined against Escherichia coli, Bacillus substilis, Klebsiella pheumoniae, Pseudomonas aerogens, Salmonalla paratyphi B, Staphylococcus aureus and Proteus vulgaris.

 

IPC Code: Int Cl7.C08G 59/70

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp.  1468-1471

 

Trace analysis of toxic heavy metals in airborne particulate matter

P K Tamrakar & K S Pitre*

Toxic heavy metals at trace levels in airborne particulate matter, have been determined by electroanalytical techniques, viz., direct current polarography, differential pulse polarography and differential pulse anodic stripping voltammetry. The study shows the presence of Pb2+, Cd2+, Zn2+, Fe3+ and Cu2+ metal ions in airborne particulate matter. The observed voltammetric results are compared with those obtained using AAS, and are found to be in good agreement.

 

IPC Code: Int Cl.7.G 01N 27/48

 

 

 

Indian Journal of Chemistry

 Vol. 43A, July 2004, pp. 1472-1474

 

Removal of heavy metal ions from aqueous solutions using
cellulosetetraethylene-pentamine [CTEPA] resin

A V Singh*, R S Sindal  & Pradeep Sharma 

 

Cellulosetetraethylenepentamine [CTEPA] resin is synthesized. The distribution coefficient of Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, and Pb2+ on CTEPA resin at different pHs have been systematically studied.

 

IPC Code: Int. Cl7. C08L 1/08; B01D 15/04