EFFECT OF DEUTERATION ON IR-SPECTRUM OF PYRIDINE N-OXIDE HEMIPERCHLORATE (BHB)(-)()A()

The broad absorption in IR spectrum of pyridine N-oxide hemiperchlorat e in the region of 1600-400 cm(-1), occurring due to the protic mode, was separated from the skeletal mode using relation A(CPA) A((BHB)A) - A(BHA) - A(B) and the following isotope ratios were obtained: nu'(H)/ nu'(D) = 1.2, nu ''(H)/nu ''(D) = 1.19, A(H)/A(D) = 2.0 and P-H/P-D = 1.7. In the solid state these absorptions were separated using ClO4 ba nd at 1100 cm(-1) as an internal standard and found to be nu'(H)/nu'(D ) = 1.13 and nu ''(H)/nu ''(D) = 1.13. Sources of errors on the estima ted spectroscopic parameters are discussed. .