PAWAN KUMAR
Articles written in Journal of Chemical Sciences
Volume 126 Issue 1 January 2014 pp 33-40
N′, N″, N‴-tris(2-pyridyloxymethyl) ethane as ionophore in potentiometric sensor for Pb(II) ions
Pawan Kumar Ashok Kumar S K Susheel K Mittal
N′,N″,N‴ tris(2-pyridyloxymethyl) ethane (TPOME) has been used as an ionophore in a polyvinylchloride (PVC)-based membrane. Membrane electrode with a composition 30:5:62:3 (PVC:TPOME: o-NPOE:NaTPB) exhibits Nernstian response towards Pb(II) ions with a slope of 30mV/decade, over a concentration range of $1 \times 10^{−5}$ M to $1 \times 10^{−1}$ M. Potential response remains almost unchanged over pH range of 3.7-6.4. The electrode shows fast response time of $15 \pm 2$ s and a lifetime of four months. It shows good selectivity for Pb(II) ions over other mono-, di- and trivalent cations. Electrode response is satisfactory in mixed solvent media up to 30% (v/v) non-aqueous contents. Selectivity of the ionophore for Pb(II) ions was determined by spectrophotometric method. The electrode can also be used as an indicator electrode in potentiometric titration of Pb(II) ions with standard chromate solution and its determination in real-life samples. Surface morphology of membrane electrode at different stages of its development and use is also discussed.
Volume 126 Issue 3 May 2014 pp 711-716 Regular Articles
Maruthai Kumaravel Pawan Kumar Maravanji S Balakrishna
The bisphosphomide-based pincer complex [PdBr{2,6-{Ph2PC(O)}2(C6H3)}] (
Volume 130 Issue 7 July 2018 Article ID 0092
Reactions of 4-diphenylphosphino benzoic acid with organotin oxides and -oxy-hydroxide
RAMAKIRUSHNAN SURIYA NARAYANAN PAKKIRISAMY THILAGAR JOYDEV ACHARYA PAWAN KUMAR DODDAPUNENI KRISHNA RAO VADAPALLI CHANDRASEKHAR ANUKUL JANA
The reactions of p-diphenylphosphinobenzoic acid (LCOOH) with various organotin precursors have been carried out. Accordingly, the reaction of [n-BuSn(O)(OH]n with LCOOH afforded the hexameric compound, [n-BuSn(O)O2C–C6H4–p-PPh2]6(1). On the other hand, the reaction of LCOOH with [n-Bu2SnO]n gave the tetrameric compound [{n-Bu2SnO2C–C6H4–p-PPh2}2O]2 (2). The 1-D coordination polymers [R3SnO2C–C6H4–p-P(O) Ph2]n,[ R=n-Bu (3), R=Ph (4)] were prepared in the reaction of [n-Bu3Sn]2O or [Ph3Sn]2O with LCOOH. The compounds 1–4 were structurally characterized by multinuclear NMR spectroscopic and single crystal X-ray diffraction studies
Volume 135, 2023
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