Mn(II), Co(II), Ni(II) and Zn salicylates: Synthesis, structure and biological properties studies

Optically Transparent TiO2 and ZnO Photocatalytic Thin Films via Salicylate-Based Sol Formulations

“…In both instances, the emerging spectral features attributed to the salicylate formation exhibit an increase proportional to that of the precursor concentration. The evidence of bidentate bridging configuration, reliant on both the carboxylic and phenolic moieties of SA for the Ti[SA] complex and exclusively on the carboxyl group for the Zn[SA] one aligns with the existing literature regarding the preferred complexation modes of these ions with catechol molecules [34,58,59]. Drawing from this insight, it is plausible to infer that the Ti[SA] structure aligns with the H 2 Ti[SA] 3 configuration elucidated by Gigant et al [33].…”

“…Both TiO 2 and ZnO deposition sols were based on the same general recipe, with SA as a stabilizing agent and IPA solvent, differing in several aspects: (1) the precursor-TTIP and ZAD for TiO 2 and ZnO deposition sols, respectively; (2) the precursor-to-stabilizer molar ratio, which was 1:3 for TTIP:SA and 1:2 for the ZAD:SA sol, as determined by the stoichiometry of the most-stable salicylate complex of the respective metal ion [33,34]; and (3) the use of reflux heating in the ZnO case, applied to accelerate the poor solubility of ZAD in IPA at room temperature (RT).…”

“…While EDTA is the default chelating agent in chemistry practice, there are more environmentally friendly alternatives available. One such example is salicylic acid (SA), a member of the catechol class of molecules, which has been shown to form stable complexes with both Ti [33] and Zn [34], and the stability of the Ti[SA] complex has been demonstrated to surpass that of Ti[EDTA] [35].…”

“…The SA film-forming properties have been investigated only on one occasion of ZnO deposition sols by Kuznetsova et al [36], revealing that salicylate sols yield optically transparent ZnO films with improved properties have been investigated only on one occasion of ZnO deposition sols by Kuznetsova et al [36], revealing that salicylate sols yield optically transparent ZnO films with improved electrical properties. This study employed a zinc precursor-to-SA ratio of 1:1, deviating from the typical zinc salicylate complex stoichiometry of 1:2 [34]. Additionally, the photocatalytic activity of the ZnO layers was not explored.…”