Importance of the Amino Moiety of the Hydrazone Group in the Electrochemical and UV‐Vis Absorption Properties of Simple Isomeric Hydrazones

Abstract

AbstractThe development of new useful supramolecular systems, as well as the optimization of existing ones, depends on the understanding of the intrinsic properties of each of the components that constitute them. A representative component of supramolecular systems are hydrazones, which can undergo three different, orthogonal dynamic processes (conformational, constitutional, and configurational) thanks to the leading role played by the amino‐like moiety of their hydrazone groups. Herein, we study the electrochemical and UV‐Vis absorption properties of two structurally related pyridylhydrazones in different solvents and analyze them in terms of the chemical environment of the corresponding hydrazone group. In this way, we establish that both the electrochemical and UV‐Vis absorption properties are mainly dominated by the additional polarization of the N−H bond, i. e., by the electron density around the nitrogen atom.