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Das P.,University of Calcutta | Chaudhuri T.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Mukhopadhyay C.,University of Calcutta
ACS Combinatorial Science | Year: 2014

This work features the base-promoted on-water synthesis of [1,6]-naphthyridines from methyl ketones, malononitrile and phenols or thiols. The reaction conditions were carefully tuned to drive the product selectivity from 3H-pyrroles to [1,6]-naphthyridines. The advantages of this method lie in its simplicity, cost effectiveness, and environmental friendliness, representing a new effort toward the on-water synthesis of [1,6]-naphthyridines without starting from a nitrogen-containing heterocycle and highlighting the versatility of the nitrile functional group. © 2014 American Chemical Society. Source


Chattopadhyay S.,University of Burdwan | Chaudhuri T.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Banerjee M.,University of Burdwan
Journal of Luminescence | Year: 2015

The first report of wavelength ratiometric sensing of electron deficient nitroaromatic explosive, 2,5-dinitrophenol (N4) with photoluminescent electron rich Schiff base H2salen (A1) derived from 1,2-ethanediamine and salicyldehyde and related complexes [Zn(salen)]·H2O (A2) and [Ni(salen)]·H2O (A3) in methanol is presented. DFT based optimization reveals that NACs (N1-N5) induce the formation of 1:2 donor-acceptor complexes with the salen based compounds. © 2014 Elsevier B.V. All rights reserved. Source


Chaudhuri T.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Karmakar A.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Ghosh S.,University of Calcutta | Mukhopadhyay C.,University of Calcutta | And 2 more authors.
Journal of Luminescence | Year: 2015

ICT based ratiometric sensing due to H-bonding interaction among three different crown ethers (C): Dibenzo-24-crown-8 (DB24C8 or C1), Benzo-15-crown-5 (B15C5 or C2) and 4′-Nitrobenzo-15-crown-5 (4′-NB15C5 or C3) along with the axle bis(benzimidazolium)propane borontetrafluoride (BBIM-propane) (3a-3d) have been studied. The association were initially ascertained from isosbestic formation and later corroborated by iso-emissive formation where C3 fails to establish iso-emissive. Stoichiometry of adducts were 1:1 both in the ground as well as in excited state. The threading or external association was finally distinguished by Monte Carlo simulation and frontier molecular orbital interaction. © 2015 Elsevier B.V. All rights reserved. Source


Chaudhuri T.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Salampuria S.,University of Burdwan | Tapaswi P.K.,University of Calcutta | Mukhopadhyay C.,University of Calcutta | And 2 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

Charge transfer complexes of electron deficient (dibenzoylmethanato)boron difluoride (DBMBF2) with polyaromatic hydrocarbons (A), as well as with highly electron rich indeno-pyridines (I) compounds in ethanol medium have been studied by electronic absorption spectroscopy. Absorption band due to a charge-transfer (CT) transitions are observed in the visible region. Utilizing the CT transition energy, the vertical electron affinities (EAv) of DBMBF2 in ethanol has been calculated. The value of EAv for DBMBF2 is found to be 2.28 eV, this is the first report of its electron affinity value. We have calculated the degrees of CT and transition dipole strengths of the DBMBF2/A and DBMBF2/I complexes. Along with both theoretically calculated and experimentally obtained vertical ionization potentials of the indeno-pyridine donors have been estimated for the first time. I show high degree of charge transfer along with high ground state stability similar to that of A. Thus indeno-pyridine (I) donors are also as good as aromatic hydrocarbons (A) for DBMBF2, having equivalent ionization potential like that of aromatic hydrocarbons. © 2013 Elsevier B.V. All rights reserved. Source


Chaudhuri T.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Salampuria S.,University of Burdwan | Mukhopadhyay C.,University of Calcutta | Tapaswi P.K.,University of Calcutta | And 2 more authors.
Journal of Photochemistry and Photobiology A: Chemistry | Year: 2012

Electron-deficient (dibenzoylmethanato)boron difluoride (DBMBF2) can efficiently discriminate between electron-rich polynuclear aromatic hydrocarbons like naphthalene (A1), anthracene (A2) or phenanthrene (A3). Even using the same sort of electron donor-acceptor (EDA) interaction, DBMBF2, can recognise different polar polynuclear aromatic systems containing indeno-pyridine groups (I1-I3). EDA Interaction has been studied both in the ground and excited states for all the six interacting systems (A, I). In all cases, absorption isosbestic has been established, but DBMBF2 forms iso-emissive complexes only with A1, A3, I1 and I3. Ground state association constants for all the complexes are varied widely. Anthracene (A2) and indeno-pyridine (I2) can be discriminated easily with their high binding constants. Theoretical justification for complex formations in terms of geometry, heat of formation, charge distribution and HOMO-LUMO interactions are provided on the basis of DFT calculations. © 2012 Elsevier B.V. Source

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