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    • Keywords


      X-ray diffraction; experimental charge density; hydrogen bonding; dipole moment; ab-initio calculations.

    • Abstract


      An experimental charge density study has been carried out on proton-transfer complexes exhibiting nonlinear optical (NLO) properties-melaminium tartrate monohydrate and L-asparaginium picrate employing high-resolution X-ray diffraction at 100 K. Both the complexes crystallize in non-centric space group P21 and the structures exhibit interesting patterns of N-H…O and O-H…O hydrogen bonding. Experimental determination of the dipole moment (𝜇) for the asymmetric unit reveals that for both the crystals, there is a large cooperative enhancement in the crystalline 𝜇 arising essentially due to hydrogen bond mediated charge transfer between the melaminium ion and the L-tartrate in one case, between the Lasparaginium ion and the picrate in the other complex. We have additionally performed theoretical calculations at the density functional theory (DFT) level to understand the origin of enhancement of the dipole moments in the two systems.

    • Author Affiliations


      Reji Thomas1 Shrinwantu Pal1 Ayan Datta2 Mariusz K Marchewka3 Henryk Ratajczak4 Swapan K Pati2 G U Kulkarni1

      1. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064
      2. Theoretical Sciences Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064
      3. Institute of Low Temperatures and Structure Research, Polish Akademy of Sciences, ul Okolna 2, 50422 Wroclaw, Poland
      4. Faculty of Chemistry, University of Wroclaw 50-383 Wroclaw, Poland
    • Dates

  • Journal of Chemical Sciences | News

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      Posted on July 25, 2019

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