The longest wavelengthπ* ←π electronic band system of ortho-hydroxybenzonitrile vapour through the absorption technique has been reported for the first time. Assuming a planar molecular geometry in both the electronic states, the molecule is classified into aCs point group, and the present spectrum is attributed to1A′ ←1A′ type corresponding to electric dipole forbidden transition1B2u ←1A1g (260 nm band system) of benzene. The most intense band at 33914 cm−1 has been assigned as the 0, 0 band, and the other vibronic bands have been interpreted in terms of the excited state and a few ground state fundamentals.
Volume 94, 2020
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