Isotope labelling studies of some aromatic N-oxides—I. A full vibrational assignment of the infrared and Raman spectra (4000-50 cm−1) of pyrazine N,N′-dioxide and its fully deuterated analogue

Complete infrared and Raman vibrational assignments of pyrazine N , N ′-dioxide and its fully deuterated analogue have been made employing the Product Rule. A few changes are recommended to an earlier assignment of the - d 0 compound. Coupling within the molecule is examined employing the ν D /ν H ratio and by comparisons with similar molecules.