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 57A

NUMBER 07

JULY 2018

CONTENTS

 

887

 

A novel electrochemical biosensor for the detection of ethambutol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rajasekhar Chokkareddy, Natesh Kumar Bhajanthri & Gan G Redhi*

 

 

 

Fabrication of glassy carbon electrode with ZnONPs-RGO nanocomposite, immobilized with HRP-enzyme, is reported for voltammetric determination of ethambutol. The HRP-ZnONPs-RGO-GCE exhibits high electrooxidation of ethambutol in phosphate buffer at pH 7.0, with a significantly enhanced electrochemical signal. The electrode shows an oxidation peak at
0.2 V with CV. Under the optimized conditions, the
DPV technique gives good limit of detection and limit of quantification values of 0.0214 μM and 0.6713 μM respectively.

 

 

 

896

 

Prussian blue/superactivated carbon composite-modified electrode for detection of p-phenylenediamine

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lin Hu*, Jin qing Li*, Xiao qin Zhou, Tong tong Bai, Qu jin Cui, Juan Tang & Wen yuan Xu

 

 

 

Prussian blue/superactivated carbon composite-modified electrode composite shows high electrocatalytic activity towards oxidation of p-phenylenediamine. DPV shows a linear increase in current with concentration of p-phenylenediamine in the range of 210-7 to 110-3 M, with a detection limit of 6.4710-8 M (S/N = 3). The relative standard deviation of the wastewater samples is <6% and the recovery rate is 97−104%.

 

 

Notes

 

905

 

Synthesis and structure characterization of two cadmium coordination polymers based on μ2-bridging bidentate hydrazine ligand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D Santhosh Shanthakumar, R Pradeep, B Subramani & B N Sivasankar*

 

 

 

Two cadmium coordination polymers, viz., [Cd(NO3)2(N2H4)2] (1) and [Cd(C3H2O4)(N2H4)] (C3H2O4: malonate) (2), exhibit bidentate bridging mode of unique hydrazine ligand, forming Cd2N4 six-membered ring motifs. Compound 1 crystallizes in the triclinic space group P-1, while compound 2 crystallizes in the monoclinic crystal system with P21/c space group.

 

 

 

910

 

Sol-gel synthesis of mesoporous hollow titania microspheres for photodegradation of 4-chlorophenol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ipsita Hazra Chowdhury & Milan Kanti Naskar*

 

 

 

Mesoporous titania hollow microspheres prepared by sol-gel method show ~90% photodegradation of the water pollutant
4-chlorophenol, within 1 h. The photocatalytic reaction shows
pseudo-first order reaction with a rate constant of 0.027 min-1. The material is reusable for another three cycles with no significant loss of activity.

 

 

 

 

915

 

Electron transfer fluorescence quenching of napthalenediols by metal ions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nachiappan Radha & Meenakshisundaram Swaminathan*

 

 

 

Fluorescence quenching of four naphthalenediols (1,5-; 1,7-; 2,7-, 2,3-NDs) by transition metal ions (Cu2+, Co2+, Ni2+, Mn2+, Zn2+, Pb2+) in 95% water-ethanol mixture reveals the electron transfer quenching mechanism via a non-emissive exciplex with electron transfer from excited fluorophore to the metal ions. Cu2+ is found to be an efficient quencher with all naphthalenediols, while the sensitivity of 1,7-ND fluorescence is much higher than that of other naphthalenediols.

 

 

 

 

 

920

 

Acoustical and optical properties of binary liquid mixtures: A comparative study

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ranjan Dey*, Praveen Rangnath P, Kartikeya Tiwari & Aditya P Pandey

 

 

 

A comparative study, employing a number of predictive approaches is carried out for evaluating ultrasonic velocity for 82 binary systems and refractive index for 76 binary systems, taking AAPD as the criterion for their predictive capability. AAPD values suggest that for ultrasonic velocity the Nomoto approach show the least deviation, i. e., values closest to experimental findings, while Van Deal approach gives the highest deviation. All the approaches are equally effective in predicting the refractive index.

 

 

 

 

 

927

 

Guide to Authors

 

 

 

 

 

 

 

Authors for correspondence are indicated by (*)

 

 

 

 

 

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Indian Journal of Chemistry

Vol. 57A, July 2018, pp. 887-895

 

A novel electrochemical biosensor for the detection of ethambutol

Rajasekhar Chokkareddy, Natesh Kumar Bhajanthri & Gan G Redhi*

Department of Chemistry, Durban University of Technology, Durban, South Africa 4000

Email: redhigg@dut.ac.za/ chokkareddys@gmail.com

A glassy carbon electrode (GCE) has been fabricated with zinc oxide nanoparticles (ZnONPs) and reduced graphene oxide (RGO) immobilized with horseradish peroxidase enzyme (HRP) for the voltammetric determination of ethambutol. Electrochemical behaviour of ethambutol has been studied with cyclic voltammetry and differential pulse voltammetry. The HRP-ZnONPs-RGO-GCE exhibits high electrooxidation of ethambutol in phosphate buffer solution at pH 7.0 and the electrochemical signal is significantly enhanced. In addition, the proposed biosensor has been characterized by transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The HRP-ZnONPs-RGO-GCE shows an oxidation peak at 0.2 V with CV. Under the optimized conditions, the DPV technique gave good limit of detection and limit of quantification values of 0.0214 μM and 0.6713 μM respectively. The HRP-ZnONPs-RGO-GCE shows excellent background current stability and gives reliable performance with pharmaceutical samples in the terms of sensitivity, reproducibility and repeatability.

Keywords: Electroanalytical chemistry, Biosensors, Ethambutol, Cyclic voltammetry, Different pulse voltammetry

 

Indian Journal of Chemistry

Vol. 57A, July 2018, pp. 896-904

 

Prussian blue/ superactivated carbon composite-modified electrode for detection of p-phenylenediamine

Lin Hu*, Jin qing Li*, Xiao qin Zhou, Tong tong Bai, Qu jin Cui, Juan Tang & Wen yuan Xu

School of Materials Science and Engineering, East China Jiao Tong University,
Nanchang, Jiangxi, 330013
, PR China

Email: 1604815540@qq.com/ hulin21@hotmail.com (LH)

Received 19 March 2018; revised and accepted 18 June 2018

A novel approach for the selective determination of p-phenylenediamine in aqueous solution using Prussian blue (PB)/ superactivated carbon (SAC) composite-modified glassy carbon electrodes is reported. The chemical constitution and microstructure of PB/SAC composites are studied by SEM, BET and IR data. Due to its unique structure and properties originating from Prussian blue in the superactivated carbon frame, PB/SAC composites show high electrocatalytic activity towards the oxidation of p-phenylenediamine. A special chemical reaction and electron transfer process on the surface of PB/SAC composite-modified GC electrode is proposed and evaluated by cyclic voltammetry and AC impedance in the presence of p-phenylenediamine. The current value of differential pulse voltammetry increases linearly with the p-phenylenediamine concentration in the range 210-7−110-3 M with a detection limit of 6.4710-8 M (S/N = 3). The relative standard deviation of the waste water samples is < 6% and the recovery rate is 97−104%. These results suggest that the modified electrode has high selection for p-phenylenediamine, good repeatability, and operational stability. The modified electrode has been successfully used to analyze the amount of p-phenylenediamine in water samples.

Keywords: Electroanalytical chemistry, Electrodes, Modified electrodes, Glassy carbon electrodes, Superactivated carbon, Cyclic voltammetry, p-Phenylenediamine, Prussian blue

 

Indian Journal of Chemistry

Vol. 57A, July 2018, pp. 905-909

 

Synthesis and structure characterization of two cadmium coordination polymers based on μ2-bridging bidentate hydrazine ligand

D Santhosh Shanthakumara, R Pradeepb, B Subramanic &
B N Sivasankarb, *

aDepartment of Chemistry, Sri Krishna College of Technology, Kovaipudur, Coimbatore 641 042, Tamilnadu, India

bDepartment of Chemistry, Government Arts College, Udhagamandalam, The Nilgiris 643 002, Tamilnadu, India

cDepartment of Chemistry, Crescent School, Vandalur, Chennai 600 048, Tamil Nadu, India

Email: sivabickol@yahoo.com

Received 25 March 2017; re-revised and accepted 22 June 2018

Synthesis, single crystal structures, spectral and thermal characteristics of two cadmium coordination polymers, viz., [Cd(NO3)2(N2H4)2] (1) [Cd(C3H2O4)(N2H4)] (where C3H2O4 is malonate) (2) are reported. The μ2-bridging bidentate binding mode of the crystallographically unique hydrazine ligands in (1) leads to a one-dimensional polymeric structure extending along c axis. The central Cd(II) in (2) exhibits hepta-coordination and is bonded to a unique malonate anion which exhibits a μ3-bridging pentadentate coordination, extending the structure along the a axis. The bridging bidentate binding of the crystallographically independent hydrazine ligand extends along b axis resulting in a 2-D structure.

Keywords: Coordination polymers, Cadmium coordination polymers, Crystal structures, Hydrazines, Malonates, μ2-Bridging bidentate, μ3-Bridging pentadentate

 

Indian Journal of Chemistry

Vol. 57A, July 2018, pp. 910-914

 

Sol-gel synthesis of mesoporous hollow titania microspheres for photodegradation of 4-chlorophenol

Ipsita Hazra Chowdhury & Milan Kanti Naskar*

Sol-Gel Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700 032, India

Email: milan@cgcri.res.in

Received 23 May 2018; revised and accepted 29 June 2018

Mesoporous titania (TiO2) hollow microspheres have been prepared by sol-gel method and characterized by XRD, Raman, FTIR, N2 adsorption-desorption study, FESEM, TEM and UV-DRS. The FESEM images reveal hollow spherical shaped particles of size 24 m. The BET surface area, total pore volume and average pore diameter of 400 C-treated sample are found to be 74.52 m2 g-1, 0.23 cm3 g-1 and 12.37 nm, respectively. The band gap energy of the product is calculated as 3.06 eV. The prepared TiO2 hollow spheres show ~90% photodegradation of the water pollutant, 4-chlorophenol, within 1 h. The photocatalytic reaction shows pseudo-first order reaction with a rate constant of 0.027 min-1. The photocatalytic experiments repeated for another three cycles showed no significant changes in the k (min-1) values, indicating the potential reusability of the material.

Keywords: Mesoporous materials, Sol-gel method, Microspheres, Microstructures, Photocatalysis, Titania

 

Indian Journal of Chemistry

Vol. 57A, July 2018, pp. 915-919

 

Electron transfer fluorescence quenching of napthalenediols by metal ions

Nachiappan Radhaa and Meenakshisundaram Swaminathanb, *

aPG and Research Department of Chemistry, Alagappa Govt. Arts College, Karaikudi 630 003, India

bNanomaterials Laboratory, Department of Chemistry, Kalasalingam University, Krishnankoil 626 126, India

Email: chemres50@gmail.com/ m.swaminathan@klu.ac.in

Received 27 March 2018; revised and accepted 22 June 2018

Fluorescence quenching of four naphthalenediols (1,5-; 1,7-; 2,7-; 2,3-NDs) by transition metal ions (Cu2+, Co2+, Ni2+, Mn2+, Zn2+, Pb2+) has been investigated in 95% water-ethanol mixture. The dynamic quenching is appreciable with all metal ions except Pb2+. Cupric ion (Cu2+) is found to be an efficient quencher with all naphthalenediols and the sensitivity of 1,7-ND fluorescence is much higher than other naphthalenediols. The quenching rate constants (kq) have been analyzed for various possible mechanisms. A good correlation of log kq values with the reduction potentials of metal ions reveals the electron transfer quenching mechanism via a non-emissive exciplex with electron transfer from excited fluorophore to the metal ions. The anomalous behavior of 1,7-ND is explained by its point group symmetry and polarity.

Keywords: Fluorescence quenching, Electron transfer quenching, Quenching, Transition metal ions, Naphthalenediols

 

Indian Journal of Chemistry

Vol. 57A, July 2018, pp. 920-925

 

Acoustical and optical properties of binary liquid mixtures:
A comparative study

Ranjan Dey*, Praveen Rangnath P, Kartikeya Tiwari & Aditya P Pandey

Department of Chemistry, Goa Campus, BITS Pilani, Zuarinagar, Goa, 403 726, India

Email: ranjandey@goa.bits-pilani.ac.in

Received 5 March 2018; revised and accepted 25 June 2018

Ultrasonic velocity in conjunction with density plays a major role in determining a number of key thermophysical parameters which are used in multifarious industrial applications. In the present investigation, a comparative study has been carried out employing a number of predictive approaches for evaluating ultrasonic velocity for 82 binary systems and refractive index for 76 binary systems, taking AAPD as the criterion for their predictive capability. Some very important findings emerge which will be beneficial to researchers in this, and allied fields of work.

Keywords: Solution chemistry, Acoustical properties, Optical properties, Ultrasonic velocities, Refractive indices, Binary systems, Density