Articles written in Journal of Chemical Sciences
Volume 108 Issue 3 June 1996 pp 267-267 Modern Trends In Inorganic Chemistry
Synthesis, characterization and photophysical studies of supramolecular metal complexes of ruthenium(II)
Volume 112 Issue 3 June 2000 pp 404-404
Dinuclear ruthenium(II) and/or osmium(II) complexes of bipyridyl ligands bridged by rigid spacers: Synthesis, electrochemical behaviour, absorption spectra and luminescence properties
Anvarhusen K Bilakhiya Beena Tyagi Parimal Paul
Volume 114 Issue 4 August 2002 pp 269-276
Ruthenium, osmium and rhodium complexes of polypyridyl ligands: Metal-promoted activities, stereochemical aspects and electrochemical properties
This article presents a brief overview of the reactions of
Volume 120 Issue 2 March 2008 pp 267-273
Analysis of urinary stone constituents using powder X-ray diffraction and FT-IR
Constituents of urinary stones obtained from various patients from western part of India, which is a highly urinary stone disease-prone area, have been analysed. Eight stones from four patients were collected through urologists and have been analysed using powder X-ray diffraction and FT-IR. Thermogravimetric analysis (TGA) and scanning electron microscopic (SEM) image of selected samples were also carried out. The analysis revealed that calcium oxalate monohydrate, which is also known as whewellite, is the common constituent of all of the stones, particularly at the initial stage of stone formation. However, multi phases viz. whewellite phase, and hydroxyl and carbonate apatite phases are also detected in the case of third and fourth patients, from where multiple stones were obtained. Interestingly, in these mixed phase stones the concentration of whewellite decreases with increasing the concentration of apatite phases. Thermal behaviour of the whewellite phase was studied by TGA and variable temperature XRD analysis. Morphology of the whewellite and apatite phases, examined by SEM image, has also been reported.
Volume 124 Issue 6 November 2012 pp 1287-1299
Calixarenes: Versatile molecules as molecular sensors for ion recognition study
Subrata Patra Debdeep Maity Ravi Gunupuru Pragati Agnihotri Parimal Paul
This article presents a brief account on designing of calixarene-based molecular sensor for recognition of various metal ions and anions and also different analytical techniques to monitor the recognition event. This review focuses only on calixarene derivatives, in which mainly the lower rim is modified incorporating either crown moiety to make calix-crown hybrid ionophore to encapsulate metal ions or some fluoregenic inorganic and organic moieties to use it as signalling unit. In order to investigate effect of conformation of the calixarene unit and steric crowding on ion selectivity, designing of these molecules have been made using both the cone and 1,3-alternate conformations of the calixarene unit and also incorporating bulky
Volume 126 Issue 3 May 2014 pp 627-635 Regular Articles
Colorimetric detection of Cu2+ and Pb2+ ions using calixarene functionalized gold nanoparticles
Ravi Gunupuru Debdeep Maity Gopala R Bhadu Ashish Chakraborty Divesh N Srivastava Parimal Paul
Calixarene functionalized gold nanoparticles (CFAuNPs) have been prepared and characterized by spectroscopic and microscopic (TEM) techniques. To use this material as potential colorimetric sensor, the binding property of this new material has been investigated with a large number of metal ions. It exhibited sharp colour change from dark brown to green and blue, detectable by naked-eye, in the presence of Cu2+ and Pb2+ ions, respectively. It has also triggered substantial change in surface plasmon resonance (SPR) band of the functionalized gold nanoparticles, which in case of Pb(II) is due to the inter particle plasmon coupling arising from the metal-induced aggregation of the nanoparticles and for Cu(II), it is because of the formation of AuCu alloy due to anti-galvanic exchange. The size and aggregation of the nanoparticles are confirmed from HRTEM images, elemental analysis and the line profiling for both the metal ions have been done by STEM-EDX analysis.
Volume 126 Issue 5 September 2014 pp 1373-1384 Special issue on Chemical Crystallography
Syntheses, characterization and crystal structures of potassium and barium complexes of a Schiff base ligand with different anions
Bhavesh Parmar Kamal Kumar Bisht Pratyush Maiti Parimal Paul Eringathodi Suresh
New pseudopolymorph of a O,N,N′-donor hydrazone ligand, 2-pyridylcarboxaldehyde isonicotinoylhydrazone (
Volume 134 All articles Published: 30 July 2022 Article ID 0080
Water dispersible glycylglycine functionalized gold nanoparticles: application in colorimetric sensing of Hg(II), Pb(II) and Cr(III) in aqueous media
RAVI GUNUPURU DEBDEEP MAITY GAURAV VYAS PARIMAL PAUL
Glycylglycine functionalized water-dispersible gold nanoparticles (AuNPs) were prepared andcharacterized on the basis of ultraviolet and visible spectroscopy (UV-vis), Fourier transform infrared (FTIR),dynamic light scattering (DLS), transmission electron microscope (TEM) and energy dispersive X-ray (EDX)analysis. The AuNPs exhibited a strong SPR band at 522 nm, which after functionalization with glycylglycine,appeared at 525 nm. This SPR band of the functionalized nanoparticles is used as a tool for thedetection of toxic metal ions in water. A large number of metal ions were tested, among which Hg2+, Pb2+,and Cr2+ exhibited distinct colour change, detectable with bare eye, and substantial UV-vis spectral change.TEM images and EDX analysis suggested that the colour change is due to metal-induced aggregation of thefunctionalized nanoparticles due to inter-particle plasmon coupling. The aggregation, which resulted in anincrease in particle size, is further confirmed by DLS measurement. A mechanism of metal-induced aggregationis also proposed. The present study is an example of a simple methodology to prepare water-dispersiblefunctionalized nanoparticle for colorimetric detection of toxic heavy metal ions such as Cr2+, Pb2+,and Hg2+ with high sensitivity.
Synopsis Glycylglycine functionalized water dispersible gold nanoaprticles were prepared, characterized and its metal-ion sensing property was evaluated with the aid of spectroscopic, microscopic and energy dispersive X-ray analysis. These nanoparticles detect Hg2+, Pb2+ and Cr3+ with colour change due to inter particle plasmon coupling because of metal-induced aggregation of the nanoparticles.
Volume 135, 2023
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