Abstract
Cyanovinylacetylene C5H3N was investigated by threshold photoelectron spectroscopy. The ionization energy (IE) was determined to be 10.04eV. This value constitutes an upward revision of the earlier value of 9.33eV. For both stereoisomers (trans and cis) computations predict very similar IEs and spectra. At 11.08eV and 11.17eV excited cationic states are observed. For the precursor 3-bromopyridine an IE of 9.34eV was obtained. The appearance energy AE0K (3-bromopyridine, 3-pyridyl+) was determined to be 11.71eV and a bond dissociation energy of the CBr bond in the 3-bromopyridine cation of 229kJmol−1 was derived.
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