, Volume 13, Issue 3, pp 219–222

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


  • V S S Sastry
    • Department of PhysicsIndian Institute of Science
  • J Ramakrishna
    • Department of PhysicsIndian Institute of Science

DOI: 10.1007/BF02846188

Cite this article as:
Sastry, V.S.S. & Ramakrishna, J. Pramana - J Phys (1979) 13: 219. doi:10.1007/BF02846188


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.


Zeeman effect4,6-dichloropyrimidine6-chloro 2,4 dimethoxypyrimidinenuclear quadrupole resonance
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© Indian Academy of Sciences 1979