Preparation, spectroscopic and acidity properties of two hydrazones: an organic lab experiment

Abstract

An undergraduate organic lab experiment is described based on the preparation of two readily accessible hydrazones. The UV-visible spectra of these N-H acids and of their conjugate bases are employed to illustrate the importance of through-conjugation in determining their acid strength and their internal charge-transfer-band transitions.

Keywords

• polynitrophenylhydrazones
• charge-transfer bands
• acid-base indicators