Analysis of the Near Ultraviolet Absorption Spectrum of Monochlorobenzene

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Abstract
The absorption spectrum of C6H5Cl at 2750–2400A has been studied in the first order of a 3 m grating spectrograph. The band system corresponds to an electronic transition A1→B1 (monochlorobenzene has the symmetry C2v) with the transition moment lying in the molecular plane perpendicular to the C–Cl bond. In agreement with this assignment to an allowed transition the 0,0 band appears strongly. Several progressions have been found involving various totally symmetrical vibrations. Besides this ``allowed'' part of the spectrum there appear ``forbidden'' bands which are due to the excitation of a non-totally symmetrical vibration of suitable symmetry. This vibration corresponds to the one (εg+ 606 cm—1) whose excitation is responsible for the appearance of the benzene spectrum. The analysis is supported by comparison with the absorption of solid monochlorobenzene at —259°C.

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