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S. D. SHARMA, Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai-400085, INDIA.
The microwave spectrum of pentafluorobenzonitrile has been reinvestigated in the light of subsequent studies of many fluorosubstituted benzenes. The rotational and centrifugal distortion constants obtained (in MHz) are A= 1029.027(24),B=759.956(14),C=437.554(14), 
J=-0/000096(13),JK=0.00070(5),K =-0.00005(11),
J=-0.000016(7) and K= -0.00044(3). The structural distortion of the benzene ring is on the expected lines with other fluorosubstituted benzene molecules.