Chittaranjan, India
Chittaranjan, India

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Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Haldar B.,University of Burdwan | Roy U.K.,Deshabandhu Mahavidyalaya
Chemical Physics Letters | Year: 2013

Steady state absorption, emission, and picosecond time resolved fluorescence and transmission electron microscopic (TEM) techniques have been exploited to substantiate and characterize the formation of a substrate - anchored β-cyclodextrin nanotubular suprastructure in aqueous medium. Experimental results reveal that suprastructure is originated from a purely ground state interaction between a newly developed bisindole based drug molecule namely 3,3′-bis(indolyl)-4-chlorophenylmethane (BICPM) with β-cyclodextrin. The bound drug molecule is susceptible to be released out from the supramolecular complex in a controlled manner by the use of endogenous surfactants and is poised to serve a significant purpose in targeted drug delivery preferably at the intestinal region. © 2013 Elsevier B.V. All rights reserved.


Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Roy U.K.,Deshabandhu Mahavidyalaya | Haldar B.,Vivekananda Mahavidyalaya | Pratihar S.,Indian Institute of Technology Bhubaneswar
Analyst | Year: 2012

A new easy-to-synthesize chemosensor, 3,3′-bis(indolyl)-4- chlorophenylmethane (hereafter S), was designed, synthesized and employed as a selective optical chemosensor for fluoride ions. 1H NMR and density functional studies on the system have been carried out to determine the nature of the interaction between S and X - (X = inorganic anions) responsible for the significant fluoride-induced changes in the absorption properties of S. The experimental results reveal that abstraction of an acidic proton of S by the fluoride ion, leading to the formation of anionic species, is responsible for the spectral changes. These changes allow signaling for the fluoride ion to detect and estimate the concentration of fluoride ion present even at the submicromolar level, accurate up to 2 μM. Calculations of the transition energies of S, S -, and S⋯F - (hydrogen bonded complex) show that only S - is responsible for the long-wavelength absorption band in the presence of F -. This journal is © The Royal Society of Chemistry 1212.


Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Roy U.K.,Deshabandhu Mahavidyalaya | Majumdar T.,Kalyani University | Haldar B.,Vivekananda Mahavidyalaya | Pratihar S.,Assam University
RSC Advances | Year: 2014

Interactions of norharmane (S), with different ions have been studied using spectroscopy, NMR and density functional studies. A significant gradual change both in absorption and emission spectra was observed upon addition of fluoride anions. The spectral change in the absorption and emission bands of norharmane (S) is found to be specific to fluoride ion; it is unaffected by the presence of other ions. Hydrogen bond mediated proton transfer from norharmane to fluoride is mainly attributed to the fluoride selective signaling behavior. Calculations of the transition energies of the norharmane (S), anionic species of norharmane (S-) and hydrogen bonded complexes (S⋯F-) show that the added fluoride anion could capture the proton in the free N-H moiety instead of the hydrogen-bonding one. Experimental results reveal that the long-wavelength absorption band in the presence of fluoride ion is due to the formation of anion. This journal is © the Partner Organisations 2014.


Sinha A.K.,Indian Institute of Technology Kharagpur | Mondal B.,Deshabandhu Mahavidyalaya | Kundu M.,Deshabandhu Mahavidyalaya | Chakraborty B.,Vivekananda Mahavidyalaya | Roy U.K.,Deshabandhu Mahavidyalaya
Organic Chemistry Frontiers | Year: 2014

Electrochemistry is used in an aqueous allylation reaction using zinc chloride as the reagent. A unit galvanic cell using a beaker containing an aqueous zinc chloride solution, zinc rod, TCO glass plate and connecting copper wire has been designed. Instead of using a connecting copper wire, an external bias can be used for applying voltage from the outside. The zinc rod served as a self-decaying anode and the TCO glass substrate as the cathode. During the process, a wire-shaped nano zinc architecture was formed from zinc chloride on the cathode. Wire-shaped nano zinc is the active reagent for the allylation of aldehydes or imines. The corresponding homoallylic alcohols or amines are prepared in good yields. Both the zinc salts and water can be recycled. © 2014 Partner Organisations.

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