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Sökning: WFRF:(Karim A.) > Konferensbidrag

  • Resultat 1-10 av 13
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  • Karim, A., et al. (författare)
  • The three-center-four-electron tetrel bond
  • 2018
  • Konferensbidrag (refereegranskat)abstract
    • We present a thermodynamically stable complex that possesses a three-center-four-electron (3c4e) tetrel bond [1,2], formed by capturing a reactive carbenium ion with a bidentate Lewis base. We report NMR spectroscopic, titration calorimetric and reaction kinetic evidences for the structure of this pentacoordinate species and discuss the properties of its tetrel bond, [N˜˜˜∙∙∙C∙∙∙˜˜˜N]+, in comparison with the analogous halogen, [N˜˜˜∙∙∙X∙∙∙˜˜˜N]+ and hydrogen, [N∙∙∙˜˜˜H∙∙∙˜˜˜N]+, bonds [3]. The necessity of the involvement of a bidentate Lewis base for the formation of a stable 3c4e tetrel bond is demonstrated by providing spectroscopic and crystallographic evidence, that a monodentate Lewis base induces a reaction rather than stabilizing the reactive species. A vastly decreased Lewis basicity of the bidentate ligand or reduced Lewis acidity of the carbenium ion weakens — or even prohibits — the formation of the pentacoordinate species, whereas synthetic modifications facilitating attractive orbital overlaps promote it. As the geometry of the pentacoordinate complex resembles the SN2 transition state, it may provide a model system for the investigation of fundamental reaction mechanisms and chemical bonding theories [4].References1. G.C. Pimentel J. Chem. Phys. 1951, 19, 446-4482. R.H. Crabtree Chem. Soc. Rev. 2017, 46, 1720-1729.3. S.B. Hakkert, M. Erdelyi J. Phys. Org. Chem. 2015, 95, 2572-25784. Karim, N. Schultz, H. Andersson, B. Nekoueishahraki et al, 2018, submitted.
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  • Afif, A., et al. (författare)
  • Electrochemical and structural characterization of BaCe 0.7 Zr 0.15 Y 0.1 Zn 0.05 O 3-δ as an electrolyte for SOFC-H
  • 2018
  • Ingår i: IET Conference Publications. ; 2018:CP750
  • Konferensbidrag (refereegranskat)abstract
    • As a potential electrolyte for proton-conducting solid oxide fuel cells (SOFC-Hs) and to get better protonic conductivity and stability, zinc doped BCZY material has been found to be promising. In this study, we report a new composition of proton conductors BaCe0.7Zr0.15Y01Zn0.05O3-s (BCZYZn10) which was investigated using XRD, SEM and conductivity measurements. Rietveld refinement of the XRD data revel a cubic perovskite structure with Pm-3m space group. Rietveld analysis of BaCe07Zr0.15Y01Zn0.05O3-5 shows the unit cell parameter is a = 4.3582(7) A. Scanning electron microscopy images shows that the grain sizes are large and compact which gives the sample high density and good protonic conductivity. The total conductivity in wet atmosphere is significantly higher than that of dry condition and the conductivity was found to be 0.004032 Scm-1 and 0.00164 Scm-1 at 600 °C in wet and dry Ar, respectively. This study indicated that perovskite electrolyte BCZYZn10 is a promising material for the next generation intermediate temperature solid oxide fuel cells (IT-SOFCs).
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  • Kloverpris, HN, et al. (författare)
  • Innate Lymphoid Cells Are Depleted in HIV Infection
  • 2014
  • Ingår i: AIDS RESEARCH AND HUMAN RETROVIRUSES. - : Mary Ann Liebert Inc. - 0889-2229 .- 1931-8405. ; 30, s. A14-A14
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Karim, Zoheb, et al. (författare)
  • Forming a cellulose based nanopaper using XPM
  • 2017
  • Ingår i: International Conference on Nanotechnology for Renewable Materials 2017. - : TAPPI Press. - 9781510850897 ; , s. 399-407
  • Konferensbidrag (refereegranskat)
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  • Resultat 1-10 av 13

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