, Volume 13, Issue 3, pp 219-222

First online:

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

  • V S S SastryAffiliated withDepartment of Physics, Indian Institute of Science
  • , J RamakrishnaAffiliated withDepartment of Physics, Indian Institute of Science

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