Self-Assembled Co(II) and Zn(II) Complexes with Soluble Bis(Hydrazone)Thiopyrimidine-Based Ligands: Electrochemical and Temperature-Dependent Properties

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

“…As the hydrazone loses a proton (H + ) during the chemical process, the presence of the N−H group in the 1‐E facilities its oxidation, so no distinct return curves are observed (see Figure 6). The oxidation events are anodically shifted in hydrazones 1‐Z and 1‐Me , [34,35] because it is more difficult to lose a proton in these compounds (impossible for 1‐Me ). We also observed that 1‐Z exhibits lower peak potentials for its oxidation events in DMF than in MeCN (even, in Figure S20, a small wave is observed before the first oxidation event), indicating that DMF helps to perturb the planarity of the quasi ‐ring leaving the N−H “free” for the chemical reaction coupled to the electron transfer processes.…”

“…[32,33] As the hydrazone loses a proton (H + ) during the chemical process, the presence of the NÀ H group in the 1-E facilities its oxidation, so no distinct return curves are observed (see Figure 6). The oxidation events are anodically shifted in hydrazones 1-Z and 1-Me, [34,35] because it is more difficult to lose a proton in these compounds 1.06/0.98 [a] (1.05) 0.89/0.82 [a] (0.86) 1.24/1.16 [a] (1. 1.69/1.55 [a] (1.58, 1.83 s ) -E red1 À 1.36/À 0.48 [a] (À 1.32, À 1.74 s )…”