Indian Institute of Technology Ropar

About: Indian Institute of Technology Ropar is a education organization based out in Ropar, India. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 1014 authors who have published 2878 publications receiving 35715 citations.

Simultaneous determination of epinephrine, paracetamol, and folic acid using transition metal ion-exchanged polyaniline–zeolite organic–inorganic hybrid materials

Abstract: Transition metal ion-exchanged polyaniline–zeolite (M 2+ -PANI-Nano-ZSM-5, where M 2+ = Cu 2+ , Ni 2+ , Co 2+ , Fe 2+ , and Mn 2+ ) organic-inorganic hybrid materials were synthesized and characterized by the complementary combination of X-ray diffraction, N 2 -adsorption, scanning electron microscopy, FT-IR and thermo gravimetric techniques. Electrochemical sensors based on M 2+ -PANI-Nano-ZSM-5 was developed for the simultaneous determination of epinephrine, paracetamol, and folic acid. Among the materials investigated in this study, Cu 2+ -PANI-Nano-ZSM-5 modified glassy carbon electrode exhibited the highest electro-catalytic activity with excellent stability, sensitivity, and selectivity. Under the optimum conditions, a wide linear range was obtained from 10 nM–600 μM for epinephrine, 15 nM–800 μM for paracetamol, and 13 nM–700 μM for folic acid. The detection limit was found to be 4, 8, and 5 nM for epinephrine, paracetamol, and folic acid, respectively. The analytical performance of the developed sensor was demonstrated in the determination of epinephrine, paracetamol, and folic acid in the commercial pharmaceutical preparations (epinephrine injection, paracetamol, and folic acid tablets) with satisfactory recovery. The proposed methodology provides promising application in drug analysis.

The influence of different coordination environments on one-dimensional Cu(II) coordination polymers for the photo-degradation of organic dyes

Abstract: Three new Cu(ii) coordination polymers, namely, {[Cu3(L(1))(NO3)2(DMF)(H2O)]·3(DMF)}n (), [Cu3(L(1))(Cl)2(DMF)2]n () and [Cu3(L(2))(NO3)4(H2O)4]n (), were synthesized from pyridine-2,6-dicarbohydrazide based imine linked tritopic ligands. All the complexes were characterized using elemental analysis, IR, UV-vis spectroscopy and ESI-MS. The solid state structures of complexes were determined using single crystal X-ray crystallography. The complexes contain trinuclear copper units connected through different anions that lead to the formation of one dimensional (ID) chain structures. Depending upon the anion of the copper salt and donor atoms of the ligands used in complexation, a small variation in the structures was observed. In complex , the trinuclear copper units are connected by phenoxo-bridging (μ2-O(-)) along with one coordinated water molecule, whereas complex is connected through chloride bridging (μ2-Cl) and complex is connected through nitrate ions (μ-[O-N-O]) along with four water molecules. Photo-catalytic activities of the synthesized complexes () were investigated. All the complexes were found to be photo-catalytically active; however, the distinct coordination environment of the metal ions (i.e. difference in the coordinated water molecules and donor sites of ligands) played a significant role in the catalytic activities. Therefore, this study presents comparative photo-catalytic studies of different coordination environments of metal ions in one-dimensional Cu(ii) coordination polymers. The results provide a potential pathway for the rational design of more efficient photo-catalysts.

A tale of three — tensionless strings and vacuum structure

Abstract: Within the premise of canonical quantisation, we re-examine the quantum structure of bosonic tensionless string theory. In the classical theory, the worldsheet metric degenerates and the Bondi-Metnzer-Sachs (BMS) algebra arises as the residual symmetries on fixing the tensionless equivalent of the conformal gauge. In the quantum regime, we find, on careful examination, that there are multiple ways to impose constraints to restrict the physical Hilbert space, which in turn lead to three distinct choices of tensionless vacua. We analyse these vacua in detail, commenting on various aspects like the central charges and the spectrum around each of them.

Schiff base modified screen printed electrode for selective determination of aluminium(III) at trace level

Abstract: An electrochemical method for determination of Al(III) has been developed using Schiff base (JS-1) modified screen printed electrodes as a disposable chemosensor. The modified screen printed electrode was characterized with voltammetry and was further confirmed by SEM and EDX data. Differential pulse voltammogram of modified SPE in the presence of Al(III) showed a characteristic peak current at −0.054 V. A linear response of the sensor was observed in the concentration range of 0.67–4.59 μg L−1 of the analyte. The limit of detection (LOD) was found to be 2.26 ng L−1 for Al(III). The proposed chemosensor selectively detects Al(III) in the presence of some alkali, alkaline earth, transition metal ions like Zn(II), Cd(II), Hg(II) and Pb(II). Complexation behavior of the ionophore for the metal ion has also been supported by theoretical studies. The method has been used for the determination of Al(III) in the natural water samples. The proposed voltammetric sensor can be reused after washing with EDTA (0.1 M) as a cleaning agent.