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Das A.M.,North East Institute of Science and Technology
Industrial and Engineering Chemistry Research | Year: 2011

A biodegradable protein fiber Antheraea assama silk (SH) was modified by using graft co-polymerization technique with methyl methacrylate (MMA; vinyl monomer) and cerric ammonium sulfate (CeIV). The grafting process was dependent on MMA, CeIV, time factors, temperatures and other properties of the fibroin composites. The possible mechanism of the SHMMA composite was explained by free radical co-polymerization, and the thermal properties were characterized by thermogravimetric analysis (TGA), differential thermogravimetry (DTG), differential thermal analysis (DTA), and differential scanning calorimetry (DSC). The kinetic parameters were also studied using the Coats and Redfern method with FORTRAN 77 computer programming and evaluating the activation energy. The structural changes of SHMMA, changes of the crystalline and amorphous characteristics after chemical process with MMA-CeIV initiator, were discussed in relation to the weight gain and X-ray diffraction curves. This study shows that silk fibroin composites modified by graft co-polymerization have improved thermal stability and chemical stability, which improve the drawbacks and make the silk fibroin a promising material in constructing textiles. © 2010 American Chemical Society. Source


Dutta D.K.,North East Institute of Science and Technology | Deb B.,North East Institute of Science and Technology
Coordination Chemistry Reviews | Year: 2011

This review reports several types of potential metals (rhodium and ruthenium) carbonyl complexes of functionalized phosphine-chalcogen donors ligands like: P-X (X = O, S, Se) and their catalytic applications particularly in (i) carbonylation of alcohols, (ii) hydrogenation of unsaturated substrates and (iii) hydroformylation of alkenes for industrially important organic molecules. © 2011 Elsevier B.V. Source


Majumder S.,North East Institute of Science and Technology | Bhuyan P.J.,North East Institute of Science and Technology
Tetrahedron Letters | Year: 2012

Some novel polycyclic thiopyrano[2,3-b]indole derivatives 7 were synthesized from simple oxindole 1 by exploring intramolecular domino hetero Diels-Alder reactions strategy. © 2011 Published by Elsevier Ltd. Source


Majumder S.,North East Institute of Science and Technology | Bhuyan P.J.,North East Institute of Science and Technology
Synlett | Year: 2011

Functionalized annelated α-Carbolines have been synthesized from oxindole following a tertiary amino effect reaction strategy. © Georg Thieme Verlag Stuttgart New York. Source


Saikia K.,North East Institute of Science and Technology | Deb B.,North East Institute of Science and Technology | Dutta D.K.,North East Institute of Science and Technology
Journal of Molecular Catalysis A: Chemical | Year: 2014

New cationic carbonyl complexes of the type [M(CO)L]Cl (1) [M = Rh (a) and Ir (b); L = P(CH2CH2PPh2)3] have been synthesized and characterized by various spectroscopic techniques including the single crystal X-ray diffraction. Both the complexes crystallize in trigonal bipyramidal symmetry with the metal at the centre. Two strong intermolecular hydrogen bonds are observed in 1a. Despite the high trans effect of the CO group, the symmetrical tetradentate phosphine ligand bonded strongly to the metal centre through all sites and thereby expelling the Cl- ion outside the coordination sphere. The complexes are very stable and inert towards the oxidative addition (OA) of small molecules like CH3I, C2H5I and I2 at room as well as higher temperature. However, the complexes show catalytic activity towards the hydroformylation of alkene to the corresponding aldehydes under the reaction conditions: pressure 35 ± 2 bar, temperature 80 ± 2°C, 500 rpm and time 5-8 h. The yields of the aldehyde products are in the ranges 55-75%. The complexes exhibited dissociation of weaker MP bond under the above reaction conditions to form a vaccant coordination site for initiation of the catalytic cycle. © 2013 Elsevier B.V. All rights reserved. Source

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