Abstract
Abstract We have resolved and analysed the nuclear quadrupole hyperfine structure in the rotational spectra of 4-pyridinecarbaldehyde and 3-pyridinecarbaldehyde, C5H4NCHO. The results are discussed and compared to those of previously measured pyridine compounds. The electron withdrawing effect of the aldehyde-function, in the 3- and 4-position at the ring system, has been calculated, and the differences in the results are discussed.
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