Indian Journal of Chemistry  

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


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VOLUME 44A

NUMBER 12

DECEMBER 2005

CONTENTS

Papers

 

2427


 

Synthesis, structure and luminescence behaviour of zinc(II) complexes containing hexadentate N-donor Schiff bases

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sk Hafijur Rahaman*, Rajarshi Ghosh,Tian-Huey Lu & Barindra Kumar Ghosh*

 

 

 

Six hexacoordinated zinc(II) complexes of the type [Zn(L)](Y)2 have been synthesised and characterized. Structural analysis of 3a reveals that zinc(II) adopts a distorted octahedral environment with a ZnN6 chromophore ligated by two pyridine N atoms (N1, N1*), two imine N atoms (N2, N2*) and two amine N atoms (N3, N3*) in cis-trans-cis orientation.

 

 

 

2433

 

Study of some biorelevant complexes of manganese(II) with active imines

 

 

 

 

 

 

 

 

 

 

 

Rekha Garg, Mahesh Kumar Saini,Nighat Fahmi & R V Singh*

 

 

Some new manganese(II) complexes of biologically relevant ligands, hydrazinecarboxamide and hydrazinecarbo­thioamide of 5-nitro-indol-2,3-dione and 6-nitro-indol-2,3-dione of the composition [MnCl(NÇX)H2O] and [Mn(NÇX)2] have been isolated, where NÇX = donor system of the ligand and X is oxygen or sulphur.

 

 

2439

 

Synthesis and characterisation of heterobimetallic N-substituted diethanolaminate-alkoxides of niobium(V)

 

 

 

 

 

 

Rajendra S Ghadwal & Anirudh Singh*

 

 

 

 


2445

 

Surface tension and fluorescence studies of polysaccharide-surfactant solutions: Agar-CTAB

 

 

 

 

 

 

Kamalesh Prasad*, Keyur P Trivedi,A K Siddhanta & A Bhattacharya

 

 

The interaction of CTAB (cetyl trimethyl ammonium bromide) with the agar has been investigated by surface tension and fluorescence measurements. The binding capacities of CTAB are found to be dependent on the polysaccharide concentrations. The interactions between the neutral agar and cationic CTAB leads to formation of pre-micelles at surfactant concentration lower than CMC (0.9585 mM/L) of CTAB. The aggregation process is caused by the electrostatic attraction. It has been proved, using pyrene fluorescence measurements methods, that CTAB forms induced micelles at concentrations smaller than those needed to form micelles in aqueous solution.

 

2450


 

Synthesis, characterization, electrochemistry, catalytic and biological activities of ruthenium(III) complexes containing dibasic tridentate Schiff bases

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K P Balasubramanian, R Karvembu,V Chinnusamy & K Natarajan*

 

 

 

The synthesis and characterisation of several ruthenium(III) Schiff base complexes of the type [RuX(L)(EPh3)2] (X= Cl or Br; E = P or As; L = dibasic anion of the Schiff bases derived by the condensation of thiosemicarbazide with acetoacetanilide, acetoacet-o-toluidide and o-chloro acetoacetanilide) are reported.

 

 

 

2455

 

 

Oxidation of DL-tartaric acid by water soluble colloidal MnO2 in the absence and presence of surfactants

 

 

 

 

 

Kabir-ud-Din*, S M Shakeel Iqubal & Zaheer Khan

 

 

 

Conventional spectrophotometry has been employed to study the oxidation of DL-tartaric acid by water soluble colloidal MnO2. The reaction is autocatalytic and follows first-order kinetics in [tartaric acid] in both the media. The reaction has acid-dependent and acid-independent paths and, in the former case, the order is fractional in [H+]. On the basis of observed kinetic results, a probable mechanism for the reaction has been proposed and discussed. The catalytic effect of TX-100 has been explained in terms of the mathematical model proposed by Tuncay, et al.

 

 

 

2462


 

Oxidation of L(+)arabinose by cerium (IV) in presence of anionic and cationic micelles

 

 

 

 

 

 

 

Kabir-ud-Din*, Mohd. Sajid Ali & Zaheer Khan

 

 

The kinetics of oxidation of L(+)arabinose by cerium(IV) have been followed by monitoring the disappearance of absorbance of cerium(IV) at 385 nm in absence and presence of surfactants. Whereas anionic micelles of sodium dodecyl sulphate (SDS) have no effect on the oxidation rate, a two-fold increase has been observed in the presence of cationic micelles of cetyltrimethylammonium bromide (CTAB). The reaction obeys first-order kinetics with respect to [L(+)arabinose] in both the media. The observed catalytic role has been analyzed in terms of Menger-Portnoy model. Various kinetic parameters (association constant of cerium(IV) species with CTAB (Ks), rate constant in micellar media (km) and activation parameters Ea, DH# and  DS#) have also been determined.

 

 

Notes

 

2470

 

Synthesis of lanthanide oxides nanotubes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Le Zhi-Ping*, Dai Li-Li , Huang Yan-Qiu  &Zou Yan-Hong

 

 

 

A hydrothermal process has been utilized to synthesize and characterize La2O3 nanotubes. The TEM results indicate that nanotubes, bamboo-shaped nanotubes, nanorods, nanowires, and nanochains of La2O3 are successfully obtained under the reported reaction conditions. The results also suggest that ethanol concentration influences the formation of one-dimensional nanostructures of La2O3.

 

 

 

 

2474

 

 

 

 

Synthesis, characterisation and properties of nickel(II)pseudohalide complexes of types [Ni(pap)2(X)2], [Ni(pap)2(X)]2(Y)2 and [Ni(pap)(N3)2]n [pap=2-(phenylazo)pyridine; X=N3-, NCS-, NCO-; Y=ClO4-, PF6-]

 

 

 

 

 

 

 

 

 

 

 

Sk. Hafijur Rahaman, Rajarshi Ghosh,
Sajal Kumar Sarkar & Barindra Kumar Ghosh*

 

 

 

Three different types of nickel(II)pseudohalide compounds, viz. red-brown [Ni(pap)2(X)2] [pap=2-(phenylazo)pyridine; X=N3-, 1; X=NCS-, 2; X=NCO-, 3], greenish-brown [Ni(pap)2 (X)]2(Y)2 (X=N3-, Y=ClO4-, 4; X=N3-, Y=PF6-, 5; X=NCO-, Y=ClO4-, 6; X=NCO-, Y=PF6-, 7) and brownish-green [Ni(pap)(N3)2]n (8) have been prepared and characterised on the basis of microanalytical, spectroscopic, magnetic, electrochemical and other physicochemical properties. In IR, n(N=N) stretching frequency is observed at considerably lower frequencies (~1370 cm-1) than the free ligand value (1425 cm-1) indicating substantial Ni(II)®pap p-back bonding. Electrochemical electron transfer study reveals nearly-reversible responses corresponding to NiIII/NiII couple in acetonitrile solutions. On the negative side of SCE, multiple ligand reductions pertaining to azo reductions are observable.

2480

 

 

Preparation and characterization of ternary cation hydrotalcite-like compounds and their adsorption of NOx

 

 

 

 

 

 

Z M Ni*, W H Yu, L G Wang, Z Q Guo &Z H Ge

 

 

Hydrotalcite-like compounds with different molar ratios of Mg :Cu:Al have been prepared by co-precipitation method and characterized by XRD, IR, TG-DTA. The results show that the samples possess feitknecht structure when Mg:Cu:Al molar ratios are 2.5:0.5:1, 2:1:1 and 1:2:1. W-Si-heteropolyacid pillared hydrotalcite-like compounds have been obtained by ion exchange method. The heteropolyacid pillared hydrotalcite is a crystalloid with highly regular layers. The maximum height of interlayer spacing is
1.4786 nm. The adsorption capacity of these materials for nitric oxides has also been measured.

 

2483

 

Kinetics and mechanism of solid state reaction between CuWO4 –Li2CO3

 

 

Huma Naseer & Rafiuddin*

 

 

The kinetics and mechanism of CuWO4-Li2CO3 solid state reaction have been studied, by the capillary method. The reaction follows the parabolic rate law, xn=kt, where x is the thickness of the product layer at time ‘t’ and ‘k’ is parabolic rate constant. Mechanism of the reaction has been suggested on the basis of X-ray powder diffraction, chemical analysis, electrical conductivity and thermal measurements. The reaction is found to be diffusion controlled.

2486



 

Kinetics and mechanism of the reaction of
di-
m-hydroxobis(bipyridyl) dipalladium(II) ion with l-cysteine at physiological pH in aqueous medium

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S C Moi & A K Ghosh*

 

 

 

2490


 

Thermodynamic and ultrasonic studies of adenosine in the presence of metal ions

 

 

 

 

 

 

P R Malasane & A S Aswar*

 

 

Volumetric, viscometric and ultrasonic studies of adenosine in aqueous solution of zinc chloride and cobaltous chloride have been carried out at 303.15 K. The experimental data have been used to evaluate some important and useful thermodynamic and acoustic parameters, viz. apparent molar volume (фv), apparent molar compressibility (фk), viscosity A and B coefficient of Jones-Dole equation, relative association and intermolecular free length. These parameters have been further used to interpret the results in terms of solute-solvent interactions.

 

2495


 

Studies on acoustic properties of some substituted pyrazole, isoxazole and pyrazoline in dioxane at
303 K

 

 

 

 

 

 

 

 

 

Shashikant A Ikhe*, P R Rajput & M L Narwade

 

 

Ultrasonic velocities and densities of 3-(2-hydroxy-3-bromo-5-methylphenyl)-5-phenyl isoxazole,1-phenyl-3-(2-hydroxy-3-bromo-5-methylphenyl)-5-(4-methoxyphenyl) pyrazole, 1-phenyl-3-(2-hydroxy-3-bromo-5-methyl­phenyl)-5-phenyl przazoline & 1-phenyl-3-(2-hydroxy-3-bromo-5-methylphenyl)- 5-(4 - metnoxy-phenyl) pyrazoline at different concentration in dioxane have been carried out at 303 K. Different acoustic properties like partial molal volume, adiabatic compressibility, apparent molal compressibility, intermolecular free length, specific acoustic impedance and relative association, etc., have been determined. The obtained parameters have been interpreted in terms of solute -solvent and solute-solute interactions.

 

 

2499

 

Annual Index

 

 

 

 

Authors for correspondence are indicated by (*)

 

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2427--2432

 

Synthesis, structure and luminescence behaviour of zinc(II) complexes
containing hexadentate N-donor Schiff bases

Sk Hafijur Rahaman*, Rajarshi Ghosh, Tian-Huey Lu & Barindra Kumar Ghosh*

Received 29 June 2005; accepted 19 October 2005

Six hexacoordinated zinc(II) complexes of the type [Zn(L)](Y)2 [L = N-(1-pyridin-2-yl-formylidene)-N'-[2-({2-[(1-pyridin-2-ylformylidene)amino]ethyl}amino)ethyl]ethane-1,2-diamine (pfad), Y = ClO4 (1a), Y = PF6 (1b); L = N-(1-pyridin-2-ylmethylidene)-N'-[2-({2-[(1-pyridin-2-ylmethylidene)amino]ethyl}amino)ethyl]ethane-1,2-diamine (pmad), Y = ClO4- (2a), Y = PF6- (2b); L = N-(1-pyridin-2-ylbenzylidene)-N'-[2-({2-[(1-pyridin-2-ylbenzylidene)amino]-ethyl}amino)ethyl]ethane-1,2-diamine (pbad), Y = ClO4- (3a), Y = PF6- (3b)] have been synthesised and characterized on the basis of microanalytical, spectroscopic and other physicochemical properties. Structural analysis of 3a reveals that zinc(II) adopts a distorted octahedral environment with a ZnN6 chromophore ligated by two pyridine N atoms (N1, N1*), two imine N atoms (N2, N2*) and two amine N atoms (N3, N3*) in cis-trans-cis orientation. Spectral properties show that the other complex ions are iso-structural with the dication in 3a.

IPC Code: Int. Cl.7 C07C 251/02; C07F 3/06

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2433-2438

 

Study of some biorelevant complexes of manganese(II) with active imines

 

Rekha Garg, Mahesh Kumar Saini, Nighat Fahmi & R V Singh*

Received 14 July 2005; accepted 10 October 2005

Some new manganese(II) complexes of biologically relevant ligands, hydrazinecarboxamide and hydrazinecarbo­thioamide of 5-nitro-indol-2,3-dione and 6-nitro-indol-2,3-dione of the composition [MnCl(NÇX)H2O] and [Mn(NÇX)2] have been isolated, where NÇX = donor system of the ligand and X is oxygen or sulphur. The complexes have been characterized by the elemental analysis, molar conductance, magnetic measurements, molecular weight determinations, IR and ESR spectral studies. On the basis of spectroscopic studies, it has been inferred that the manganese(II) complexes are consistent with the tetrahedral geometry. The magnetic measurements reveal that the manganese(II) complexes are high spin in nature. All the ligands and their corresponding complexes have been screened for their antifungal and antibacterial activities.

IPC Code: Int. Cl.7 C07F13/00

 

Indian Journal of Chemistry

Vol. 44A, December 2005, pp. 2439-2444

 

Synthesis and characterisation of heterobimetallic N-substituted
diethanolaminate-alkoxides of niobium(V)

Rajendra S Ghadwal & Anirudh Singh*

Received 2 May 2005; accepted 25 October 2005

Heterobimetallic N-substituted diethanolaminate-alkoxide complexes of niobium(V) of the type: Nb(RDEA)3{M(OR1)n-1} (where RDEA = RN(CH2CH2O-)2 and R = Ph(2), Me(3) or Bu(4) (M = Al, n = 3, R1 = Pri); Ph(M = Ga, n = 3, R1 = Pri)(5); Ph(M = Sb, n = 3, R1 = Pri)(6); Ph(M = Ti, n = 4, R1 = Pri)(7); Ph(M = Ge, n = 4, R1 = Et)(8); Ph(M = Zr, n = 4, R1 = Pri)(9); Ph(M = Ta, n = 5, R1 = Pri)(10)) have been prepared by the equimolar reactions of homoleptic N-substituted diethanolaminate complexes (i.e., metalloligands) of the formulation; Nb(RDEA)2(RDEAH)(R = Ph (1a); Me (1b); Bu (1c)) with different metal alkoxides. All of these heterobimetallic complexes have been characterised by analytical, molecular weight, and spectral (IR, 1H and 27Al NMR) data. On the basis of these results, plausible structures for the new complexes have been suggested. The synthesis and characterisation of a new series of heterobimetallic complexes reported in this paper greatly expands the horizon of heterometal alkoxide chemistry. Furthermore, these fascinating compounds have obvious importance as precursors in ceramics.

IPC Code: Int. Cl.7 C07F9/00

 

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2445-2449

 

Surface tension and fluorescence studies of polysaccharide-surfactant solutions: Agar-CTAB

Kamalesh Prasad*, Keyur P Trivedi, A K Siddhanta & A Bhattacharya

Received 14 June 2005; accepted 12 October 2005

The interaction of CTAB (cetyl trimethyl ammonium bromide) with the agar has been investigated by surface tension and fluorescence measurements. The plots of the surface tension versus concentration of the surfactants for different polymer concentrations show interesting features of the polymer surfactant binding. The binding capacities of CTAB are found to be dependent on the polysaccharide concentrations. These results are interpreted in terms of a polymer surfactant complex or micelle formed by binding between the surfactant ions and the polymer. The surface tension studies show that the 218 mmol CTAB could be bound to the galactose-anhydrogalactose unit of agar. Fluorescence measurements using pyrene as a photophysical probe have been carried out for agar and CTAB mixtures. The interactions between the neutral agar and cationic CTAB leads to formation of pre-micelles at surfactant concentration lower than CMC (0.9585 mM/L) of CTAB. The aggregation process is caused by the electrostatic attraction. It has been proved, using pyrene fluorescence measurements methods, that CTAB forms induced micelles at concentrations smaller than those needed to form micelles in aqueous solution.

IPC Code: Int Cl,7 C11D; G01N13/00; G01N21/64

 

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2450-2454

 

Synthesis, characterization, electrochemistry, catalytic and biological activities of ruthenium(III) complexes containing dibasic tridentate Schiff bases

 

K P Balasubramanian, R Karvembu, V Chinnusamy & K Natarajan*

Received 24 June 2005; accepted 14 October 2005

The synthesis and characterisation of several ruthenium(III) Schiff base complexes of the type [RuX(L)(EPh3)2] (X= Cl or Br; E = P or As; L = dibasic anion of the Schiff bases derived by the condensation of thiosemicarbazide with acetoacetanilide, acetoacet-o-toluidide and o-chloro acetoacetanilide) are reported. IR, EPR, electronic spectra, electrochemistry and catalytic activity of the complexes are discussed. An octahedral structure has been tentatively assigned to all of the new complexes. The complexes have been subjected to antibacterial study.

IPC Code: Int. Cl.7 C07F15/00; C07C251/02

 

Indian Journal of Chemistry

Vol. 44A, December 2005, pp. 2455-2461

Oxidation of DL-tartaric acid by water soluble colloidal MnO2 in the absence and presence of surfactants

Kabir-ud-Din*, S M Shakeel Iqubal & Zaheer Khan

Received 23 February 2005; revised 16 October 2005

Conventional spectrophotometry has been employed to study the oxidation of DL-tartaric acid by water soluble colloidal MnO2 in the absence and presence of surfactants. Anionic sodium dodecyl sulfate has no effect, non-ionic Triton X-100 catalyzed the reaction and experiments were not possible in presence of cationic cetyltrimethylammonium bromide due to the precipitation of MnO2. The reaction is autocatalytic and follows first-order kinetics in [tartaric acid] in both the media. The reaction has acid-dependent and acid-independent paths and, in the former case, the order is fractional in [H+]. The effect of externally added manganese(II) is complex. Due to its involvement in a series of reactions, it is not possible to predict exact dependence of rate constants on [Mn(II)]. On the basis of observed kinetic results, a probable mechanism for the reaction has been proposed and discussed. The catalytic effect of TX-100 has been explained in terms of the mathematical model proposed by Tuncay, et al.

IPC Code: Int. Cl7 C07B33/00; C11D

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2462-2469

 

Oxidation of L(+)arabinose by cerium(IV) in presence of anionic and cationic micelles

Kabir-ud-Din*, Mohd. Sajid Ali & Zaheer Khan

Received 23 February 2005; revised 20 October 2005

The kinetics of oxidation of L(+)arabinose by cerium(IV) have been followed by monitoring the disappearance of absorbance of cerium(IV) at 385 nm in absence and presence of surfactants. Whereas anionic micelles of sodium dodecyl sulphate (SDS) have no effect on the oxidation rate, a two-fold increase has been observed in the presence of cationic micelles of cetyltrimethylammonium bromide (CTAB). The reaction obeys first-order kinetics with respect to [L(+)arabinose] in both the media. The observed catalytic role has been analyzed in terms of Menger-Portnoy model. Various kinetic parameters (association constant of cerium(IV) species with CTAB (Ks), rate constant in micellar media (km) and activation parameters Ea, DH# and  DS#) have also been determined.

IPC Code: Int. Cl.7 C07B33/00; C11D

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2470-2473

 

Synthesis of lanthanide oxides nanotubes

Le Zhi-Ping*, Dai Li-Li , Huang Yan-Qiu  &
Zou Yan-Hong

Received 27 July 2005; accepted 14 October 2005

A hydrothermal process has been utilized to synthesize and characterize La2O3 nanotubes. The TEM results indicate that nanotubes, bamboo-shaped nanotubes, nanorods, nanowires, and nanochains of La2O3 are successfully obtained under the reported reaction conditions. The results also suggest that ethanol concentration influences the formation of one-dimensional nanostructures of La2O3.

IPC Code: Int. Cl.7 B82B3/00

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2474-2479

 

Synthesis, characterization and properties of nickel(II)pseudohalide complexes of types [Ni(pap)2(X)2], [Ni(pap)2(X)]2(Y)2 and [Ni(pap)(N3)2]n [pap=2-(phenylazo)pyridine; X=N3-, NCS-, NCO-; Y=ClO4-, PF6-]

 

Sk. Hafijur Rahaman*, Rajarshi Ghosh,
Sajal Kumar Sarkar & Barindra Kumar Ghosh

Received 29 June 2005; accepted 31 October 2005

Three different types of nickel(II)pseudohalide compounds, viz. red-brown [Ni(pap)2(X)2] [pap=2-(phenylazo)pyridine; X=N3-, 1; X=NCS-, 2; X=NCO-, 3], greenish-brown [Ni(pap)2- (X)]2(Y)2 (X=N3-, Y=ClO4-, 4; X=N3-, Y=PF6-, 5; X=NCO-, Y=ClO4-, 6; X=NCO-, Y=PF6-, 7) and brownish-green [Ni(pap)(N3)2]n (8) have been prepared and characterised on the basis of microanalytical, spectroscopic, magnetic, electrochemical and other physicochemical properties. In IR, n(N=N) stretching frequency is observed at considerably lower frequencies (~1370 cm-1) than the free ligand value (1425 cm-1) indicating substantial Ni(II)®pap p-back bonding and in electronic spectra, the MLCT bands show characteristic lower energy shifts in going from mono- to polynuclear compounds via dinuclear ones. Room temperature magnetic measurements show uniformly two-electron paramagnetism for each nickel(II) ion in these complexes. Electrochemical electron transfer study reveals nearly-reversible responses corresponding to NiIII/NiII couple in acetonitrile solutions. On the negative side of SCE, multiple ligand reductions pertaining to azo reductions are observable.

IPC Code: Int. Cl.7 C07F15/04

 

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2480-2482

 

Preparation and characterization of ternary cation hydrotalcite-like compounds and their adsorption of NOx

Z M Ni*, W H Yu, L G Wang, Z Q Guo & Z H Ge

Received 5 January 2004; revised 13 October2005

Hydrotalcite-like compounds with different molar ratios of Mg: Cu:Al have been prepared by co-precipitation method and characterized by XRD, IR, TG-DTA. The results show that the samples possess feitknecht structure when Mg:Cu:Al molar ratios are 2.5:0.5:1, 2:1:1 and 1:2:1. W-Si-heteropolyacid pillared hydrotalcite-like compounds have been obtained by ion exchange method. The heteropolyacid pillared hydrotalcite is a crystalloid with highly regular layers. The maximum spacing of interlayer is 1.4786nm. The adsorption capacity of these materials for nitric oxides has also been measured.

IPC Code: Int. Cl.7 B01J21/00; G01N30/00

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2483-2485

 

Kinetics and mechanism of solid state reaction between CuWO4 -Li2CO3

Huma Naseer & Rafiuddin*

Received 20 January 2005; revised 28 September 2005

The kinetics and mechanism of CuWO4-Li2CO3 solid state reaction have been studied, by the capillary method. The reaction follows the parabolic rate law, xn=kt, where x is the thickness of the product layer at time ‘t’ and ‘k’ is parabolic rate constant. Mechanism of the reaction has been suggested on the basis of X-ray powder diffraction, chemical analysis, electrical conductivity and thermal measurements. The reaction is found to be diffusion controlled.

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2486-2489

 

Kinetics and mechanism of the reaction of
di-
m-hydroxobis(bipyridyl) dipalladium(II) ion with l-cysteine at physiological pH in aqueous medium

 

S C Moi & A K Ghosh*

Received 1 April 2005; revised 5 October 2005

Kinetics of interaction between l-cysteine with the title complex has been studied spectrophotometrically as a function of [Pd2(bipy)2(OH)22+], [l-cysteine], pH and temperature. The reaction has been monitored at lmax 278 nm. The reaction rate increases linearly with increase in [l-cysteine] in the studied concentration range. The second order rate constants have been calculated from the slope of the kobs versus [ligand] plot. From the experimental findings an associative mechanism for the substitution process is suggested. The activation parameters (DH¹ =33.6±1.5 kJ mol-1, DS¹ =-134±5 J K-1 mol-1) also support this proposition.


Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2490-2494

 

Thermodynamic and ultrasonic studies of adenosine in the presence of metal ions

P R Malasane & A S Aswar *

Received 8 April 2005; accepted 30 September 2005

 Volumetric, viscometric and ultrasonic studies of adenosine in aqueous solution of zinc chloride and cobaltous chloride have been carried out at 303.15 K. The experimental data have been used to evaluate some important and useful thermodynamic and acoustic parameters, viz. apparent molar volume (фv), apparent molar compressibility (фk), viscosity A and B coefficient of Jones-Dole equation, relative association and intermolecular free length. These parameters have been further used to interpret the results in terms of solute-solvent interactions. Attempts have also been made to explain changes in the water structure when a cosolvent is added.

IPC Code: Int. Cl.7: B01J19/00; G01N

Indian Journal of Chemistry
Vol. 44A, December 2005, pp. 2495-2497

 

Studies on acoustic properties of some substituted pyrazole, isoxazole and pyrazoline in dioxane at 303 K

 

Shashikant A Ikhe*, P R Rajput & M L Narwade

Received 19 October 2004; revised 27 September 2005

Ultrasonic velocities and densities of 3-(2-hydroxy-3-bromo-5-methylphenyl)-5-phenyl isoxazole, 1-phenyl-3-(2-hydroxy-3-bromo-5-methylphenyl)-5-(4-methoxyphenyl) pyrazole (L2), 1-phenyl-3-(2-hydroxy-3-bromo-5-methylphenyl)-5-phenyl pyra­zoline and 1-phenyl-3-(2-hydroxy-3-bromo-5-methylphenyl)-5-(4-methoxy-phenyl) pyrazoline at different concentration in dioxane have been carried out at 303 K. Different acoustic properties like partial molal volume, adiabatic compressibility, apparent molal compressibility, intermolecular free length, specific acoustic impedance and relative association, etc., have been determined. These parameters obtained have been interpreted in terms of solute-solvent and solute-solute interactions.

IPC Code: Int. Cl.7 G01N