Abstract
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 aC s point group, and the present spectrum is attributed to1 A′ ←1 A′ type corresponding to electric dipole forbidden transition1 B 2u ←1 A 1g (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.
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