Debdeep Maity
Articles written in Journal of Chemical Sciences
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 calix[4]arene 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 calix[4]arene 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 134, 2022
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