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 56A

NUMBER 12

DECEMBER 2017

 

CONTENTS

 

 

1285

 

Rapid synthesis of Tb3+-doped gadolinium oxyhydroxide and oxide green phosphors and their biological behaviour

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Saima Wani, Shafquat Majeed & S A Shivashankar*

 

 

 

Green phosphors based on terbium doped GdOOH and Gd2O3 powders are prepared without using any surfactants, by a rapid microwave-assisted method with ethanol as a solvent. The
as-prepared Tb3+:GdOOH powders are crystalline with a flower-like morphology comprising many two-dimensional flake-like structures. These powders show good luminescence properties under UV excitation and conversion to Tb3+:Gd2O3 takes place at modest temperatures by annealing. The annealed powders show increase in luminescence intensity due to phase change from oxyhydroxide to oxide as well as increase in crystallinity as a result of annealing. The as-prepared powders show considerable toxicity towards cells, whereas the annealed powders do not hamper the cell growth.

 

Fig-ga.tif

 

 

 

1293

 

Photocatalytic decolourisation of toxic dye, Acid Blue 25, with graphene based N-doped titania

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Susmita Sen Gupta* & Dhruba Chakrabortty

 

 

 

 

The photocatalytic decolourisation of Acid Blue 25 has been carried out using graphene based N-doped TiO2. Acidic pH favours the decolourisation of dye as compared to neutral and alkaline pH. The mineralisation of the dye was 90.7% within 7 h.

 

 

 

 

1302

 

Thionine-functionalized graphene oxide nanosheet as an efficient electrocatalyst for NADH oxidation and H2O2 reduction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ali A Ensafi*, Navid Zandi-Atashbar,
Zeynab Ahmadi Sarsahra & Behzad Rezaei

 

 

 

 

Thionine-functionalized graphene oxide has been used as an efficient electrocatalyst in the detection of hydrogen peroxide and nicotinamide adenine dinucleotide under the optimum conditions of pH 3.0 (PBS, 0.1 mol L–1), 20 wt% of the modifier, and working potential of 0.24 V for oxidation of NADH and 0.00 V for reduction of H2O2. Two linear ranges of 2.0–200 µmol L–1 and 200–500 µmol L–1 and a detection limit of 0.43 µmol L–1 are obtained for NADH analysis. For H2O2 these are respectively
2.0–3500 µmol L–1 and 1.3 µmol L–1.

 

 

 

Notes

 

1310

 

Novel acrylate polymer nanocomposites with nano CdS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nirmal N Patel, Kaushal P Patel * & Rajnikant M Patel

 

 

 

Polymeric nanocomposites of CDMPA and PCPMA with
nano CdS are synthesized by in-situ technique. XRD studies show
cubic structured nanocrystalline polymer nanocomposites with crystalline size in the range of 2.41–3.16 nm. Activation energy for thermal decomposition of polymer nanocomposites is less than that of the virgin polymers. The polymer nanocomposites are thermally less stable than the virgin polymers.

 

 

 

 

1317

 

A green polymeric zinc(II) complex: Synthesis, structural characterization, and theoretical studies

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abhijit Pal, Sarat Chandra Kumar, Partha Mitra, Shubhamoy Chowdhury* & Rajarshi Ghosh*

 

 

 

Synthesis and X-ray structural characterization of a Zn(II) polymer [Zn(NCS)2(L)]n [L = 4,4˘-bipyridine] is reported. The compound, having Zn(II) with d10 electronic configuration at the centre of each monomeric unit, shows green colour at λmax = 648 nm. MO energy calculations show that the HOMO-LUMO energy difference gradually decreases from monomeric to tetrameric units. These calculations show that ~13 molecular units are responsible for the experimentally observed green colour of the Zn(II) polymer.

 

 

 

 

 

1321

 

Preparation and catalytic property of carbon nanotubes supported Pt and Ru nanoparticles for hydrogenation of aldehyde and substituted acetophenone in water

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Zhiwang Yang*, Cheng Lei, Wenlong Chen,
Ruxue Liu, Hong Wei, Yali Ma, Shuangyan Meng,

Shaoping Hu & Yuli Wei

 

 

 

Pt and Ru nanoparticles are deposited on carbon nanotubes by a simple wet impregnation method using aqueous solutions of platinum and ruthenium salts to prepare the supported catalysts, Pt/CNTs (5 wt%) and Ru/CNTs (10 wt%). Pt/CNTs and Ru/CNTs are highly active and chemoselective catalysts for the aqueous-phase hydrogenation of aldehydes and substituted acetophenones. The use of water as the reaction medium makes these catalytic systems environmentally friendly.

 

 

 

1283

 

Authors for correspondence are indicated by (*)

 

 

 

 

 

 

 

 


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Indian Journal of Chemistry

Vol. 56A, December 2017, pp. 1285-1292

 

Rapid synthesis of Tb3+-doped gadolinium oxyhydroxide and
oxide green phosphors and their biological behaviour

Saima Wania, Shafquat Majeedb,c & S A Shivashankarb,d,*

aDepartment of Biochemistry, Indian Institute of Science, Bangalore 560 012, India

bMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India

cDepartment of Nanotechnology, University of Kashmir, Hazratbal, Srinagar 190 006

dCentre for Nano Science and Engineering, Indian Institute of Science, Bangalore 560 012, India

Email: shivu@cense.iisc.ernet.in

Received 13 August 2017; revised and accepted 17 November 2017

 

Green phosphors based on terbium doped GdOOH and Gd2O3 powders are prepared through a rapid microwave-assisted solution based method using ethanol as a solvent and without using any surfactants. The as-prepared Tb3+:GdOOH powders are crystalline and show a flower-like morphology comprising many two-dimensional flake-like structures. The as-prepared powders show good luminescence properties under UV excitation and their conversion to Tb3+:Gd2O3 by annealing takes place at modest temperatures. A considerable increase in luminescence intensity is observed for the annealed powders, which is ascribed to phase change from oxyhydroxide to oxide as well as an increase in crystallinity as a result of annealing. Cytotoxicity studies reveal that the as-prepared powders show considerable toxicity towards the cells, whereas the annealed powders do not hamper the cell growth.

Keywords: Rare earths, Self-assembly, Nanomaterials, Optical materials, Photoluminescence, Phosphors, Green phosphors, Terbium doping, Gadolinium, Oxyhydroxides, Oxides

 

 

Indian Journal of Chemistry

Vol. 56A, December 2017, pp. 1293-1301

 

Photocatalytic decolourisation of a toxic dye, Acid Blue 25,
with graphene based N-doped titania

Susmita Sen Gupta* & Dhruba Chakrabortty

Department of Chemistry, B N College, Dhubri, Assam, India

Email: susmitasengupta21@gmail.com

Received 20 December 2016; revised and accepted 22 November 2017

This study investigates adsorption of Acid Blue 25 dye and photocatalytic decolourisation with graphene based nitrogen doped TiO2. The prepared material has been characterised by XRD, BET, DRS, PL, TEM and XPS study. The photocatalytic reaction was carried out after the attainment of adsorption equilibrium between graphene based nitrogen doped TiO2 and dye. The photocatalyst dose, initial dye concentration and solution pH are found to influence both the processes. The percentage decolourisation increases on increase of amount of catalyst from 95.57% (load: 0.125 g L-1) to 99.91% (load: 0.75 g L-1). However, further increase of the catalyst dose to 1.25 g L-1 leads to decrease in the extent of decolourisation. The decolourisation is favoured by lower dye concentration. The solution pH influences the reaction process and at pH 3.0, the material can decolourise almost 99% of the dye within 180 min of irradiation time. COD results reveal ~99% mineralisation of the dye on 420 min of irradiation. The percentage decolourisation of the dye is higher with graphene based nitrogen doped TiO2 as compared to NTiO2 or TiO2 P25. The adsorption interaction follows the Lagergren first order model and modified Langmuir-Hinselwood model is preferably followed by dye decolourisation.

Keywords: Degradation, Dye degradation, Photocatalytic decolourisation, Graphene based N-TiO2, Titania

 

 

 

 

Indian Journal of Chemistry

Vol. 56A, December 2017, pp. 1302-1309

 

Thionine-functionalized graphene oxide nanosheet as an efficient electrocatalyst for NADH oxidation and H2O2 reduction

Ali A Ensafi*, Navid Zandi-Atashbar, Zeynab Ahmadi Sarsahra & Behzad Rezaei

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

Email: ensafi@cc.iut.ac.ir/ensafi@yahoo.com/aaensafi@gmail.com

Received 24 September 2017; revised and accepted 29 November 2017

Thionine-functionalized graphene oxide (Th-GO) has been successfully prepared for use as an efficient electrocatalyst in the electrochemical detection of hydrogen peroxide and nicotinamide adenine dinucleotide (NADH), and subsequently characterized by FT-IR spectroscopy, X-ray diffraction, transmission and scanning electron microscopy, and electrochemical methods. Electrochemical studies reveal that the carbon paste electrode modified with Th-GO decreases the working potentials to 0.24 V and 0.00 V towards oxidation of NADH and reduction of H2O2, respectively. Two linear ranges of 2.0–200 µmol L–1 and 200–500 µmol L–1 and a detection limit of 0.43 µmol L–1 have been obtained for NADH analysis. These quantitative data for H2O2 determination are 2.0–3500 µmol L–1 and 1.3 µmol L–1 respectively. Th-GO/CPE shows satisfactory results in terms of repeatability, reproducibility, and selectivity towards NADH and H2O2 analysis in both buffer and real sample.

Keywords: Electrocatalysts, Electrodes, Modified electrodes, Functionalised electrodes, Thionine-functionalized graphene oxide, Graphene oxide, Hydrogen peroxide, Nicotinamide adenine dinucleotide, Chronoamperometry

 

 

Indian Journal of Chemistry

Vol. 56A, December 2017, pp. 1310-1316

 

Novel acrylate polymer nanocomposites with nano CdS

Nirmal N Patel, Kaushal P Patel* & Rajnikant M Patel

Department of Advanced Organic Chemistry, P. D. Patel Institute of Applied Science,
Charotar University of Science and Technology, Changa 388 421, Gujarat, India

Email: kaus_chem@yahoo.com

Homopolymer of 4-chloro-3,5-dimethylphenylacrylate (CDMPA) and p-chlorophenylmethacrylate (PCPMA) and their copolymers with different compositions are synthesized by free radical polymerization technique using 2,2-azo-bis-isobutyronitrile as initiator in N,N-dimethylformamide as solvent at 70 °C. Their polymeric nanocomposites with nano CdS have then been synthesized by in-situ technique. Characterisation of the monomers, polymers and their polymeric nanocomposites with nano CdS have been done by spectroscopic methods. X-ray diffraction studies show cubic structured nanocrystalline CdS with 2.41-3.16 nm diameter. Compositions of the copolymers are determined by 1H-NMR. Linear methods, namely, Finemann-Ross, inverted Finemann-Ross, Kelen-Tudos and extended Kelen-Tudos have been used for the determination of reactivity ratio of the monomers. Thermal analyses of the virgin polymers and their polymeric nanocomposites with nano CdS have been carried out by thermogravimetric studies. The kinetic parameters of virgin polymers and polymeric nanocomposites with nano CdS are determined by Broido method and Coats-Redfern method. Antimicrobial screening of homo and copolymers and one of the polymer nanocomposite with nano CdS has been studied against different microorganisms.

Keywords: Polymer nanocomposites, Acrylate polymer nanocomposites, Nanocomposites, Cadmium sulphide, Thermal analysis

 

 

 

 

 

 

 

Indian Journal of Chemistry

Vol. 56A, December 2017, pp. 1317-1320

 

A green polymeric zinc(II) complex: Synthesis, structural
characterization, and theoretical studies

Abhijit Pala, Sarat Chandra Kumara, Partha Mitrab, Shubhamoy Chowdhuryc, * & Rajarshi Ghosha, *

aDepartment of Chemistry, The University of Burdwan, Burdwan 713 104, West Bengal, India

Email: rghosh@chem.buruniv.ac.in

bDepartment of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Kolkata 700 032,West Bengal, India

cDepartment of Chemistry, University of Gour Banga, Malda 732 103, West Bengal, India

Email: shubha103@yahoo.com

Synthesis and X-ray structural characterization of a Zn(II) polymer [Zn(NCS)2(L)]n (1) [L = 4,4˘-bipyridine] have been reported. The compound, having a metal [Zn(II)] with d10 electronic configuration at the centre of each monomeric unit, shows green colour (absorption band at 648 nm). Molecular orbital energy calculations (and the theoretical spectra obtained therefrom) using GAUSSIAN-09 program package show that HOMO-LUMO energy difference gradually decreases from monomeric to tetrameric units. On considering λmax to be 648 nm in the non-linear fit equation (λmax versus molecular units), it is found that 13 molecular units are responsible for the experimentally observed green color of 1.

Keywords: Coordination chemistry, Coordination polymers, Polymeric complexes, Molecular orbital energy calculations, Density functional calculations, Zinc, 4,4˘-Bipyridine

 

 

Indian Journal of Chemistry

Vol. 56A, December 2017, pp. 1321-1326

 

Preparation and catalytic property of carbon nanotubes supported
Pt and Ru nanoparticles for hydrogenation of aldehyde and
substituted
acetophenone in water

Zhiwang Yang*, Cheng Lei, Wenlong Chen, Ruxue Liu, Hong Wei,
Yali Ma, Shuangyan Meng, Shaoping Hu &
Yuli Wei

Key Laboratory of Polymer Materials of Gansu Province, Key Laboratory of
Eco-Environment-Related Polymer Materials, Ministry of Education
,
College of Chemistry and Chemical Engineering,
Northwest Normal University
Lanzhou 730070, China

Email: yangzw_nwnu@163.com

Received 16 September 2017; revised and accepted 30 November 2017

Pt and Ru nanoparticles are deposited on carbon nanotubes via a simple wet impregnation method using aqueous solutions of platinum and ruthenium salts to prepare the supported catalysts of Pt/CNTs (nominal load 5 wt%) and Ru/CNTs (nominal load 10 wt%). The catalysts are characterized by XRD, XPS, BET and TEM data and tested for the hydrogenation of aldehyde and substituted acetophenone using pure water as the sole solvent. The reaction conditions are well optimized through the hydrogenation of p-methoxybenzaldehyde and acetophenone. These catalysts exhibit high activity for the hydrogenation of aldehydes and ketones. Many aldehydes and ketones can be efficiently converted to the corresponding alcohols in the presence of Pt/CNTs and Ru/CNTs. The use of water as solvent makes this catalytic system environmental-friendly.

Keywords: Catalytic hydrogenation, Hydrogenation, Carbon nanotubes, Nanoparticles, Platinum, Ruthenium, Aldehydes, Ketones, Wet impregnation method