Indian Journal of Chemistry

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

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CODEN: ICACEC; ISSN: 0376-4710 (Print), 0975-0975 (Online)

 

 

 

VOLUME 55A

NUMBER 6

JUNE 2016

 

CONTENTS

 

 

649

 

Phosphorous-doped porous carbon derived from paste of newly growing Ficus benghalensis as hydrogen storage material

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arjunan Ariharan, Balasubramanian Viswanathan* & Vaiyapuri Nandhakumar

 

 

 

Synthesis of heteroatom (P) doped porous carbon (PDPC) derived from the paste of newly growing Indian banyan tree (Ficus benghalensis), involving activation, carbonization and phosphorous-doping processes using H3PO4 as activating agent and as phosphorous source, is reported. PDPC shows a wafer-like morphology with specific surface area of 1406 m/g and hydrogen storage capacity of ~1.2 wt% at 298 K and 100 bar.

 

 

 

 

657

 

Computational studies on chemically engineered carbon nanotubes as HCl sensor

 

 

 

 

 

 

 

 

 

 

 

 

Taghi Haghtalab & Hamed Soleymanabadi*

 

 

 

The effect of functionalization on sensing properties of SWNT on work function and HOMO-LUMO gap changes is studied by DFT calculations. Protonation of the basic group induces electron transfer from the semiconducting SWNTs, thereby altering the HOMO and LUMO levels and significantly changing the electronic properties and work function.

 

 

 

 

664

 

Temperature dependent study of thermophysical and optical properties of binary mixtures of imidazolium based ionic liquids

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T S Krishna, M G Sankar, A K Nain* & B Munibhadrayya

 

 

 

The excess thermodynamic parameters and deviations in refractive index of [Bmim][PF4]+α,ω-propanediol binary mixtures indicate significant interactions in these mixtures, which follows the
order: 1,2-propanedio l> 1,3-propanediol. The results indicate the applicability of various mixing rules of refractive index in theoretically estimating refractive indices of these mixtures.

 

 

 

Notes

 

676

 

Sodium paramolybdate revisited

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bikshandarkoil R Srinivasan* & Sudesh M Morajkar

 

 

 

A rational synthesis of Na6[Mo7O24]14H2O and its spectral, thermal and electrochemical characterization is reported. Cyclic voltammetric and conductivity studies of an aqueous solution of Na6[Mo7O24]14H2O reveal the presence of hydrated Na+ ions and heptamolybdate anions in solution, unlike a sodium coordinated heptamolybdate in the solid state.

 

 

 

 

 

681

 

Phenoxazinone synthase activity of a mononuclear cobalt(III) complex

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Merry Mitra & Rajarshi Ghosh*

 

 

 

The trivalent cobalt complex, [Co(HL)2](OAc).H2O (1) [H2L =
N-(2-hydroxyethyl)-3-methoxysalicylaldimine], is as an effective model for phenoxazinone synthase to oxidize o-aminophenol to
2-aminophenoxazine-3-one in methanol in presence of aerial oxygen. The reaction follows Michaelis-Menten enzymatic reaction kinetics with high turnover number (Kcat = 2.83104 h-1).

 

 

 

 

686

 

One-step synthesis of ZnO nanowires on zinc foils and their photocatalytic properties

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mohamad Mohsen Momeni*

 

 

 

ZnO nanostructures with different morphologies have been grown on zinc foil substrate by a novel and facile hydrothermal method, without the assistance of any catalyst or template. The resulting ZnO nanorods have diameter of ~ 70-90 nm and average length in the range of 0.5-2.0 μm. The as-grown ZnO samples have very good crystallinity. A comparison of the photocatalytic degradation of methyl orange with different ZnO shows that the photocatalytic properties of the ZnO nanostructures depend on the morphology of ZnO. The growth process of the ZnO nanorods is proposed based on the solid-liquid-solid mechanism.

 

 

 

 

692

 

Naphthalimide based hybrid nanoparticles for selective recognition of Hg(II)

 

 

 

 

 

 

 

 

 

 

 

Anu Saini & Navneet Kaur*

 

 

 

IJCA-439_Fig-5.tif

 

 

 

698

 

Corrigendum

 

 

 

 

Authors for correspondence are indicated by (*)

 

 

 

 

 


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Indian Journal of Chemistry

Vol. 55A, June 2016, pp. 649-656

 

 

Phosphorous-doped porous carbon derived from paste of newly growing
Ficus benghalensis as hydrogen storage material

Arjunan Ariharan, Balasubramanian Viswanathan* & Vaiyapuri Nandhakumar

National Centre for Catalysis Research, Indian Institute of Technology Madras,
Chennai 600 036, India

Email: bvnathan@iitm.ac.in

Received 28 February 2016; revised and accepted 26 May 2016

The synthesis of heteroatom (P)-doped porous carbon derived from the paste of newly growing
Indian banyan tree (Ficus benghalensis) is described. The synthesis involves activation, carbonization and phosphorous-doping processes using H3PO4 as activating agent and as phosphorous source. The phosphorous-doped porous carbon material shows a wafer-like morphology with specific surface area of 1406 m/g. This material exhibits hydrogen storage capacity of ~1.2 wt% at 298 K and 100 bar. This easily prepared carbon material is promising for realistic hydrogen storage.

Keywords: Hydrogen storage, Carbon materials, Porous carbon, Activation, Biomass, Heteroatom doped carbon, Phosphorous doped carbon, Ficus benghalensis

 

Indian Journal of Chemistry

Vol. 55A, June 2016, pp. 657-663

 

 

Computational studies on chemically engineered carbon
nanotubes as HCl sensor

Taghi Haghtalaba & Hamed Soleymanabadib, *

aDepartment of Chemistry, Payame Noor University, 19395-4697, Tehran, Iran

bYoung Researchers and Elite club, Shahr-e Rey Branch, Islamic Azad University, Tehran, Iran

Email: soleymanabadi.h@gmail.com

Received 13 September 2015; revised and accepted 16 May 2016

The effect of functionalization on the sensing properties of a single-walled carbon nanotube in terms of work function and HOMO-LUMO gap changes has been studied by using density functional calculations. Our findings explain the experimental data on the electrical behavior of the SWNTs upon HCl adsorption. Protonation of the basic group induces an electron transfer from the semiconducting SWNTs, there by altering the HOMO and LUMO levels and significantly changing the electronic properties and work function. The performance of the pyridinol functionalized SWNT as an HCl gas sensor is shown to be superior to the other studied materials, in terms of both response signal and reversibility time. These results are in good agreement with the experimental reports.

Keywords: Theoretical chemistry, Electronic properties, Sensors, Hydrogen chloride sensors, Nanostructures, Carbon nanotubes, Functionalised carbon nanotubes

 

 

 

 

 

 

 

 

Indian Journal of Chemistry

Vol. 55A, June 2016, pp. 664-675

 

 

Temperature dependent study of thermophysical and optical properties of binary mixtures of imidazolium based ionic liquids

T S Krishnaa, M G Sankarb, A K Nainc, * & B Munibhadrayyad

aDepartment of Physics, Vignan Institute of Technology & Science, Hyderabad 508 284, Telangana, India

bDepartment of Chemistry, J. K. C. College, Guntur 5220 06, Andhra Pradesh, India

cDepartment of Chemistry, Dyal Singh College, University of Delhi, New Delhi 110 003, India

Email: ak_nain@yahoo.co.in

dDepartment of Physics, Sri Venkateswara College of Engineering, Bangalore 562 157, Karnataka, India

Received 12 February 2016; revised and accepted 30 May 2016

The experimental values of densities (r) and speeds of sound (u) of the binary mixtures of ionic liquid
1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4
] with α,ω-propanediols have been used to calculate the internal pressure (), free volume (Vf), excess internal pressure (), excess free volume (), excess free energy (), excess enthalpy () and excess entropy () covering the entire composition range expressed by mole fractions of ionic liquid at temperatures (298.15, 303.15, 308.15, 313,15, 318.15 and 323.15 K). The refractive indices (nD) of these mixtures have been measured at above-mentioned temperatures and the deviations in refractive index () have been calculated. The results have been interpreted in terms of intermolecular interactions between the component molecules in the mixture. The variations of these excess properties with composition indicate that the interactions between [Bmim][BF4] and
α,ω-propanediols in these mixtures follows the order: 1,2-propanediol > 1,3-propanediol.

Keywords: Thermodynamic properties, Excess thermodynamic properties, Refractive index,
Molecular interactions, Alkanediols, 1-Butyl-3-methylimidazolium tetrafluoroborate

 

Indian Journal of Chemistry

Vol. 55A, June 2016, pp. 676-680

 

 

Sodium paramolybdate revisited

Bikshandarkoil R Srinivasan* & Sudesh M Morajkar

Department of Chemistry, Goa University, Goa 403206, India

Email: srini@unigoa.ac.in

Received 02 March 2016; accepted 26 May 2016

The term paramolybdate refers to the species of formula [Mo7O24]6-. A convenient method for the rational synthesis of a sodium paramolybdate namely hexasodium heptamolybdate(VI) 14-hydrate Na6[Mo7O24]14H2O and its spectral and thermal characterization are reported. Cyclic voltammetric and conductivity studies of an aqueous solution of Na6[Mo7O24]14H2O reveal the presence of hydrated Na+ ions and heptamolybdate anions in solution unlike a sodium coordinated heptamolybdate in the solid state.

Keywords: Paramolybdate, Sodium, Hexasodium heptamolybdate 14-hydrate, Cyclic voltammetry

 

 

 

 

 

 

 

 

Indian Journal of Chemistry

Vol. 55A, June 2016, pp. 681-685

 

 

Phenoxazinone synthase activity of a mononuclear
cobalt(III) complex

Merry Mitra & Rajarshi Ghosh*

Department of Chemistry, The University of Burdwan, Burdwan 713 104, India

Email: rghosh@chem.buruniv.ac.in

Received 19 October 2015; revised and accepted 17 May 2016

The trivalent cobalt complex, [Co(HL)2](OAc).H2O (1) [H2L = N-(2-hydroxyethyl)-3-methoxysalicylaldimine], behaves as an effective catalyst towards oxidative dehydrogenation of o-aminophenol to 2-aminophenoxazine-3-one in aerial oxygen. The reaction follows Michaelis-Menten enzymatic reaction kinetics in methanol with turnover number (Kcat) = 2.83104 h-1.

Keywords: Coordination chemistry, Metalloenzymes, Dehydrogenation, Oxidative dehydrogenation, Phenoxazinone synthase activity, Cobalt, Michaelis-Menten kinetics

 

Indian Journal of Chemistry

Vol. 55A, June 2016, pp. 686-691

One-step synthesis of ZnO nanowires on zinc foils and
their photocatalytic properties

Mohamad Mohsen Momeni*

Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran

Email: mm.momeni@cc.iut.ac.ir

Received 01 June 2015; revised and accepted 23 May 2016

ZnO nanostructures with different morphologies have been grown on zinc foil substrate by a novel and facile hydrothermal method, without the assistance of any catalyst or template. The obtained ZnO samples are characterized by SEM, EDX, XRD, UV-visible and photoluminescence techniques. The resulting ZnO nanorod has a diameter of about 70-90 nm and the average length is estimated to be in the range of 0.5-2.0 μm. It is shown that the as-grown ZnO samples have a very good crystallinity. A comparison of the photocatalytic degradation of methyl orange with different ZnO shows that the photocatalytic properties of the ZnO nanostructures depend on the morphology of ZnO. The growth process of the ZnO nanorods is proposed based on the solid-liquid-solid mechanism.

Keywords: Oxides, Zinc oxide, Nanostructures, Nanorods, Morphology, Hydrothermal synthesis, Photocatalytic activity.

 

Indian Journal of Chemistry

Vol. 55A, June 2016, pp. 692-697

 

Naphthalimide based hybrid nanoparticles for selective
recognition of Hg(II)

Anu Sainia & Navneet Kaura,b*

aCentre for Nanoscience and Nanotechnology (UIEAST)
bDepartment of Chemistry, Panjab University Chandigarh 160 014, India

Email: navneetkaur@pu.ac.in

Received 10 August 2015; revised and accepted 26 May 2016

1,8-Naphthalic anhydride and cystamine dihydrochloride have been used as precursors for the synthesis of a dipodal compound (1) which has been further processed into fluorescent organic nanoparticles (N1) by re-precipitation technique. This has resulted in the formation of spherical nanoparticles which have been characterized by TEM and DLS studies. These hybrid nanomaterials composed of organic and inorganic nanoparticles have been used as a sensing platform for determination of mercury(II). The sensing phenomenon shows a ratiometric response for the selective determination with Hg2+ ion among other heavy metal ions with enhancement in fluorescence emission at 340 nm and decrease in emission intensity at 469 nm. Other heavy metal show no interference towards recognition of Hg2+ ion.

Keywords: Nanomaterials, Hybrid nanomaterials, Selective recognition, Fluorescence, Mercury