Āsansol, India
Āsansol, India

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Berger R.J.F.,University of Salzburg | Jana S.,Asansol Girls College | Frohlich R.,University of Munster | Mitzel N.W.,Bielefeld University
Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences | Year: 2015

A mixed lithium/beryllium diethylhydroxylaminate compound containingn nbutyl beryllium units of total molecular compositionn nBe(ONEt2)2 [(LiONEt2)2nBuBeONEt2]2 (1) was isolated from a reaction mixture of nbutyl lithium, N,N-diethylhydroxylamine and BeCl2 in diethylether/thf. The crystal structure of 1 has been determined by X-ray diffraction. The aggregate is composed of two ladder-type subunits connected in a beryllium-centered distorted tetrahedron of four oxygen atoms. Only the lithium atoms are engaged in coordination with the nitrogen donor atoms. The DFT calculations support the positional occupation determined for Li and Be in the crystal structure. The DFT and the solid-state structure are in excellent agreement, indicating only weak intermolecular interactions in the solid state. Structural details of metal atom coordination are discussed.

Berger R.J.F.,University of Salzburg | Jana S.,Asansol Girls College | Monkowius U.,Johannes Kepler University | Mitzel N.W.,Bielefeld University
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

The title compound, [Be2(C6H14NO)4], was prepared from a solution of BeCl2 in diethyl ether and two equivalents of O-lithiated N,N-diisopropylhydoxylamine. The molecular structure is composed of a dinuclear unit forming a central five-membered planar Be-O-Be-O-N ring (sum of internal angles = 540.0°; r.m.s. deviation from planarity = 0.0087 Å). Both Be atoms show the unusual coordination number of three, with one Be atom coordinated by three O atoms and the other by two O atoms and one N atom, both in distorted trigonal-planar environments. The Be-O distances are in the range 1.493 (5)-1.600 (5) Å and the Be-N distance is 1.741 (5) Å.

Berger R.J.F.,University of Salzburg | Jana S.,Asansol Girls College | Frohlich R.,University of Munster | Mitzel N.W.,Bielefeld University
Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences | Year: 2011

The preparation of tetraberyllium-μ 4-oxo- hexa[η 2-(ortho-fluorobenzoate)] [Be 4O(o-C6H4FCOO) 6, 2] and tetraberyllium-μ 4-oxo-μ 2- hydroxo-penta[η 2-(ortho-fluorobenzoate)] [Be 4O(o- C 6H 4F-COO) 5(OH), 3] from silver ortho-fluorobenzoate and BeCl 2 in Et 2O/thf solution containing varying amounts of water is reported. The single-crystal structures of 2·tetrahydrofuran and 3·Et 2O 2 hexane are discussed in comparison with the structure of the known basic beryllium and zinc carboxylates [M 4O(RCOO) 6, M = Be, Zn]. DFT calculations show that lower symmetry has to be expected for Be-based M 4O- framework-type compounds as compared to the corresponding Zn compounds. Compound 2 is a potential precursor for new compounds with MOF substructure motifs. © 2011 Verlag der Zeitschrift für Naturforschung, Tübingen.

Saha M.,Asansol Girls College | Sengupta S.,Rabindra Mahavidyalaya
Transactions of the Institute of Indian Geographers | Year: 2014

For thousands of years, forest and indigenous populations have evolved in symbiosis. Forest plays an important role in enhancing livelihood requirements for rural community and in maintaining ecological balance. Over 53 million tribal people in India, about 60% of the rural communities directly rely on forest for their day-to-day requirement. The bio- cultural knowledge of these 'ecosystem people 'has made them sustain their life through the ages. However, the ethnic minorities (STs) in rural India are characterized by geographic isolation as well as strong sense of socio-cultural exclusion. Their livelihood highly depends on utilizing timber as well as non-timber forest products (NTFPs) for various purposes, e.g. medicine, food, economic and other socio-religious purposes. However, it has gained importance in recent years in policy strategies of Government owing to its significance in life support substance to large number of forest dwelling communities. The Bankura district, situated in the western part of West Bengal, is actually the fag-end of the Chhotonagpur plateau and enriched with the wealth of forest (Recorded forest area of 21.53%, State Forest Report, 2006-07, Govt, of West Bengal) covering Jaypur, Vishnupur, Ranibandh, Taldangra block etc. The present study opts to explain an intimate man-nature relationship between forest resources and Santali livelihood of Jaypur block of the said district. It also throws light on traditional knowledge and cultural practices of this social group for conservation and preservation offorest resources.

Panda G.,Asansol Engineering College | Gangopadhyay S.,Asansol Girls College
Journal of the Indian Chemical Society | Year: 2012

The investigation was undertaken with an objective of developing techniques for the potability of drinking water of some villages near the Asansol Coal field areas. For this investigation the water samples of different villages have been collected at pre-monsoon and post-monsoon seasons. In chemical analysis, the pH value, total hardness, total dissolved solid (TDS), total suspended solids (TSS), total solid presence, conductivity, different metal content (like arsenic, lead, copper, cadmium, iron etc.), chloride content etc. have been determined. In bacteriological analysis, the content of faecal coliform/E. coli have been determined. It was found from the chemical analysis that surface water is better for drinking purpose than ground water. Bacteriological studies also support the non-potability of ground water present in most of the villages.

Chakraborty M.,Asansol Girls College | Sen S.,Triveni Devi Bhalotia College
Journal of Electron Spectroscopy and Related Phenomena | Year: 2015

Abstract Quantum entanglement and its paradoxical properties are genuine physical resources for various quantum information tasks like quantum teleportation, quantum cryptography, and quantum computer technology. The physical characteristic of the entanglement of quantum-mechanical states, both for pure and mixed, has been recognized as a central resource in various aspects of quantum information processing. In this article, we study the bipartite entanglement of one electronic qubit along with the ionic qudit and also entanglement between two electronic qubits. The tripartite entanglement properties also have been investigated between two electronic qubits and an ionic qudit. All these studies have been done for the single-step double photoionization from an atom following the absorption of a single photon without observing spin orbit interaction. The dimension of the Hilbert space of the qudit depends upon the electronic state of the residual photoion A2+. In absence of SOI, when Russell-Saunders coupling (L-S coupling) is applicable, dimension of the qudit is equal to the spin multiplicity of A2+. For estimations of entanglement and mixedness, we consider the Peres-Horodecki condition, concurrence, entanglement of formation, negativity, linear and von Neumann entropies. In case of L-S coupling, all the properties of a qubit-qudit system can be predicted merely with the knowledge of the spins of the target atom and the residual photoion. © 2015 Elsevier B.V.

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