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Arāmbāgh, India

Tiwary A.S.,Netaji Mahavidyalaya | Datta K.,Muc Womens College | Mukherjee A.K.,Digital Computer System
Computational and Theoretical Chemistry | Year: 2015

Ground state intermolecular interactions in the molecular complexes of TCNE with a series of methylated indoles have been predicted with almost equal efficiency by the B3LYP and the M06 family of functionals. However, TDDFT calculation with the B3LYP functional failed to find any charge transfer (CT) absorption band of the complexes while each of the functionals M06, M06-2X, M06-HF and M06-L succeeded; the calculated CT transition energies vary with the calculated vertical ionization potentials of the indoles, complying with Mulliken's theory of charge transfer complexes and are fairly close to reported experimental values. © 2015 Elsevier B.V. Source


Dhara K.,Sambhu Nath College | Sarkar K.,Netaji Mahavidyalaya | Srimani D.,Indian Association for The Cultivation of Science | Saha S.K.,Sambhu Nath College | And 2 more authors.
Dalton Transactions | Year: 2010

A new Pd(ii) bounded 2D-hexagonally ordered functionalized MCM-41 type material (IV) has been synthesized. Functionalization was carried out by the anchoring of 3-aminopropyltriethoxysilane in the MCM-41 type mesoporous material, followed by grafting with 2,6-diacetylpyridine (DAP) to give a N 3-type Schiff base chelating attachment for the Pd(ii) species. Fourier transform infrared (FTIR), powder X-ray diffraction (PXRD) and high resolution transmission electron microscopy (HRTEM) studies have been used to characterize the material. Material IV behaves as a highly active catalyst towards Suzuki-Miyaura cross-coupling reaction for the synthesis of biaryl organics. In addition, IV acts as a true heterogeneous catalyst in coupling reaction. It was found that this catalyst is highly efficient and recyclable towards Suzuki-Miyaura reaction with high turn over frequencies. X-Ray photoelectron spectroscopic (XPS) analysis was employed to understand the oxidation state of the palladium atom in the catalyst (IV) and its loading in the material. © The Royal Society of Chemistry. Source


Laha M.,Netaji Mahavidyalaya
Transactions of the Institute of Indian Geographers | Year: 2013

Ascending demand for irrigation and non-availability of water from the tail ends of canals together make the use of groundwater irrigation imperative in the blocks along Bhagirathi (Kalna-I, II, Katwa-I, II, Purbasthali-I, II) in district Barddhaman. Overuse of groundwater and consequent depletion of groundwater level has unfortunately invited arsenic pollution in groundwater through oxidation of arseno-pyrites. Arsenic occurs at 15m-60m depth and is often found along the existing or abandoned river course, bils etc. Long continued consumption of arsenic-contaminated drinking water gives rise to arsenicosis, a health hazard which may cause skin lesions to cancer. Victims are mainly undernourished, poor people of remote villages in Purbasthali-I,II blocks deprived of minimum transport, education, medical and marketing facilities. Among them Mandra, Kalyanpur, Phaleya villages are mention-worthy. Once affected by the health hazard, economic condition of a family deteriorates further and sometimes it turns to a social hazard. To the women it's more pathetic because ugly skin lesion of arsenicosis and declined working capacity make them burden to their families either at their parents' house or at their in-laws'house. Source


Tiwary A.S.,Netaji Mahavidyalaya | Mukherjee A.K.,Digital Computer System
Chemical Physics Letters | Year: 2014

The B3LYP and the M06 family of functionals were found to be of nearly equal efficiency for predicting the 13C and 15N NMR chemical shifts (which are ground state properties) of molecular complexes of TCNE with naphthalene and pyrene. But the B3LYP functional could not find any charge transfer (CT) absorption band of the complexes. The M06, M06-2X, M06-HF and M06-L functionals could find two CT absorption bands in CCl4 medium by a TDDFT calculation under the PCM formalism for solvation; the calculated CT transition energies are comparable with the reported experimental values, M06-2X and M06-L agreeing best with experiment. © 2014 Elsevier B.V. Source


Laha M.,Netaji Mahavidyalaya
Transactions of the Institute of Indian Geographers | Year: 2011

In Raniganj Coalfield of western Barddhaman, West Bengal, India the original scheduled caste inhabitants had a forest-based economy. Forest economy dies up when coalmines are opened up. Demand of safe drinking water increases by this advanced society. In underground mining groundwater is disposed to the surface. It meets various needs, eg, drinking, domestic and agricultural need as well as needs in colliery itself, enriching surface water bodies and so on in this water-crisis region. But evacuation of both solid coal and liquid water disturbs the hydrostatic balance. It results into mine hazards like roof fall, subsidence, mine fire, mine inundation etc. Thus the transformation of action space from forest based to mining based one by an alien social group superposed on the pre-existing social space brings environmental hazards and it directly ajfects the poor original social groups living at slums. Source

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