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    • Zeeman effect of NQR in 4,6-dichloropyrimidine and 6-chloro 2,4-dimethoxypyrimidine

      V S S Sastry J Ramakrishna

      Solids Volume 13 Issue 3 September 1979 pp 219-222

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      https://www.ias.ac.in/article/fulltext/pram/013/03/0219-0222

    • Keywords

       

      Zeeman effect; 4,6-dichloropyrimidine; 6-chloro 2,4 dimethoxypyrimidine; nuclear quadrupole resonance

    • Abstract

       

      Zeeman (35Cl) NQR studies in polycrystalline samples of 4,6-dichloropyrimidine and 6 chloro 2,4 dimethoxypyrimidine show that the asymmetry at the four chemically inequivalent chlorine sites in the former is about 10%, while in the latter (one line) the asymmetry is almost zero. Using a valence-bond picture, C-Cl bonds in 4,6-dichloropyrimidine have been characterised, and the results are also compared with those in a corresponding benzene compound using a simple molecular orbital calculation. The axial symmetry of C-Cl bond in the second compound has been attributed to mesomeric effects.

    • Author Affiliations

       

      V S S Sastry1 2 J Ramakrishna1

      1. Department of Physics, Indian Institute of Science, Bangalore - 560 012
      2. School of Physics, University of Hyderabad, Hyderabad - 500 001

    • Dates

       
      Published
      September 1979
      Manuscript received
      26 December 1978
      Manuscript revised
      3 July 1979

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