Dr. Bhupendranath Dutta Smriti Mahavidyalaya

Barddhamān, India

Dr. Bhupendranath Dutta Smriti Mahavidyalaya

Barddhamān, India
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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.


Chaudhuri T.,Dr Bhupendranath Dutta Smriti Mahavidyalaya | Shivran N.,Bhabha Atomic Research Center | Mula S.,Bhabha Atomic Research Center | Karmakar A.,Dr Bhupendranath Dutta Smriti Mahavidyalaya | And 3 more authors.
RSC Advances | Year: 2016

Polycyclic aromatic hydrocarbons (PAHs) demonstrated unusual weak C-H⋯F type H-bonding interaction with meso-substituted Bodipy dyes (1-3) in ethanol medium. Isosbestic absorptions and enhancement of emission of Bodipy were spectroscopically detected with three chosen PAHs (naphthalene, anthracene and phenanthrene). IR, 1H and 19F NMR, cyclic voltammetry, powder X-ray and Monte Carlo simulation of adducts confirmed interaction of PAHs via C-H⋯F type H-bonding with the chosen dyes. © The Royal Society of Chemistry 2016.


Chaudhuri T.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Ghosh K.,University of Burdwan | Mula S.,Bhabha Atomic Research Center | Chattopadhyay S.,Bhabha Atomic Research Center | Benerjee M.,University of Burdwan
Journal of Luminescence | Year: 2014

The ground and excited states interaction of 4,4-difluoro-1,3,5,7- tetramethyl-2,6-diethyl-8-phenyl-4-bora-3a,4a-diaza-s-indacene (2), the meso-phenyl congener of the well-known boradipyrromethene (bodipy) dye PM567 (1) with C60 and C70 (F) was investigated in non-polar (toluene) and polar coordinating (benzonitrile) solvents. This dye 2 can efficiently recognize C70 in both the solvent media. It is the first report of wavelength ratiometric sensing of fullerenes (F) in both the ground and excited state. The dye (2) showed higher binding selectivity with C 70 over C60 in both benzonitrile and toluene having selectivity ratio C70/C60∼100 and ∼6 respectively. Interestingly, the binding preference of the dye 2 with C70/C 60 was opposite to that observed with the dye 1 (possessing a meso-methyl group), revealing that the selectivity can be tuned by subtle changes in the bodipy structure. The results were rationalized by 1H NMR and DFT based calculation of the HOMO-LUMO interactions of the adduct. © 2013 Elsevier B.V.


Karmakar A.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Chaudhuri T.,Dr. Bhupendranath Dutta Smriti Mahavidyalaya | Mula S.,Bhabha Atomic Research Center | Chattopadhyay S.,Bhabha Atomic Research Center
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

UV-Vis spectral investigations of electron donor-acceptor complexes of laser dye 2,6-Diethyl-4,4-difluoro-1,3,5,7-tetramethyl-8-(4′-hydroxyphenyl)-4-bora-3a,4a-diaza-s-indecene (1c) with chloranils and fullerenes are reported in toluene medium. Well defined charge transfer (CT) absorption bands have been located in the visible region. Oscillator strengths, transition dipole and resonance energies of the CT complexes have been estimated. Vertical ionization potential of 1c has been determined utilizing Mulliken's equation. A possible mechanism for the interaction between electronic subsystems of chloranils, [60]- and [70]fullerenes with three different BODIPY dyes (1a, 1b and 1c shown in Fig. 1) have been discussed in comparing the parameters like degree of charge transfer and binding constant in nonpolar toluene. Comparison of 1c complexes is done with DFT/B3LYP/6-31G optimized gas phase geometries. © 2014 Elsevier B.V. All rights reserved.


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.


PubMed | University of Calcutta, Dr. Bhupendranath Dutta Smriti Mahavidyalaya and Bhabha Atomic Research Center
Type: | Journal: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy | Year: 2016

This is the first report of charge transfer band for crown-axel H-bonding interaction in acetonitrile medium. Monte Carlo simulation established external association of small cavity crown with BBIM-propane dication axels. Resonance energy, binding constant and ratiometric detection of association of xanthenocrown-5 (1) and bis-napthalenocrown-6 (2) with bis-(benzimidazolium)propane borontetrafluoride (3a-3d) in acetonitrile determined the effect of steric factor towards association.


PubMed | Dr. Bhupendranath Dutta Smriti Mahavidyalaya and Bhabha Atomic Research Center
Type: | Journal: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy | Year: 2014

UV-Vis spectral investigations of electron donor-acceptor complexes of laser dye 2,6-Diethyl-4,4-difluoro-1,3,5,7-tetramethyl-8-(4-hydroxyphenyl)-4-bora-3a,4a-diaza-s-indecene (1c) with chloranils and fullerenes are reported in toluene medium. Well defined charge transfer (CT) absorption bands have been located in the visible region. Oscillator strengths, transition dipole and resonance energies of the CT complexes have been estimated. Vertical ionization potential of 1c has been determined utilizing Mullikens equation. A possible mechanism for the interaction between electronic subsystems of chloranils, [60]- and [70]fullerenes with three different BODIPY dyes (1a, 1b and 1c shown in Fig. 1) have been discussed in comparing the parameters like degree of charge transfer and binding constant in nonpolar toluene. Comparison of 1c complexes is done with DFT/B3LYP/6-31G optimized gas phase geometries.


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.


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.


PubMed | Dr Bhupendranath Dutta Smriti Mahavidyalaya
Type: Journal Article | Journal: Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology | Year: 2015

Quinone type compounds (o-chloranil, p-chloranil and DDQ) demonstrate excellent H-bonding interactions with a meso-phenol Bodipy dye (1) in both ground and excited state in a non-polar toluene medium. The spectroscopic detection of isosbestic absorption occurs with both quinones and fullerenes, but only quinones form isoemissive complexes with dye 1. (1)H NMR study and Monte Carlo global minima searching justified the above mentioned results with efficiency.

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