Light absorption studies: part I. The ultraviolet absorption spectra of some nitrobenzenes. Part II. The ultraviolet absorption spectra of some benzaldehydes

Dearden, John C. (1958) Light absorption studies: part I. The ultraviolet absorption spectra of some nitrobenzenes. Part II. The ultraviolet absorption spectra of some benzaldehydes. Masters thesis, Memorial University of Newfoundland.

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Abstract

Part 1. The electronic spectra of nitrobenzenes are discussed in terms of previously proposed hypotheses relating electronic interactions and ultraviolet absorption data. A previously suggested order of mesomeric interaction of the halogens is confirmed, and it is shown that the mesomeric effect of the nitro-group is greater than that of the acetyl-group. -- Part 2. The electronic spectra of benzaldehydes are recorded and discussed in terms of previously proposed hypotheses. The formyl- group is shown to endow benzene derivatives with similar properties to those of nitro- and acetyl-substituted derivatives, save that the effects of steric interactions and hydrogen bonding are slightly modified. An order of mesomeric interaction -NO ₂ > -CHO > -COCH₃ > -COOH is proposed.

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