Synthesis, structure, electrochemical properties and superoxide radical scavenging activities of two thiocyanate copper(II) complexes with different pyridyl-benzoxazole ligands

A novel azo‐azomethine benzoxazole‐based ligand and its transition metal (II), (III), (IV) complexes: Synthesis, characterization, theoretical studies, biological evaluation, and catalytic application

“…The singlet signal characteristic of the exchangeable phenolic proton appeared sharp with high intensity at 7.57 ppm, which disappeared in D 2 O, indicating that the starting compound CBOAHB exists in the azo form in solution with higher ratio than hydrazo form (Scheme 1). One doublet at 7.28 ppm, one singlet at 7.19 ppm, and one doublet of doublet at 6.94 ppm are equivalent to the two protons (H 25 , H 27 ), the two protons (H 26 , H 29 ), and the two protons (H 24 , H 28 ), respectively. [59] Moreover, there are also protons of the solvent ([CD 3 ] 2 S=O), which are observed at 3.33 ppm.…”

“…Moreover, the structural changes that result in a significant p-delocalization over the N-heterocyclic ligand are more crucial for these compounds than those of the regular complexes. [27,28] Schiff bases containing a heterocyclic pyridine skeleton are excellent ligands due to the presence of a nitrogen atom as a coordination center in the structure of the pyridine ring with a localized electron pair [29,30] which provides coordination centers for direct linkage with transition metal ions. [31] One of the most ominous problems for natural resources is the rate at which water is becoming more contaminated.…”

Linear and Bent Noncovalent M···S═C═N–M′ Interactions: The Case of Palladium(II) and Platinum(II) Thiocyanate Species

“…Short contacts between metal sites and the uncomplexed S atom of N-coordinated thiocyanates (isothiocyanates in another terminology), M···SCN–M′, were discussed in more than 50 articles. Among these studies, in only two works, , appropriate QTAIM-based calculations have been performed to provide theoretical justification of the experimentally observed short contacts, while the other group of reports was limited to qualitative characterization of these contacts in the framework of “long coordination bond”, − “weak coordination”, ,− or “semicoordination” , terminologyall without an insight into the nature of these interactions.…”

Two silver(I) complexes: Synthesis, structures, and electrochemicalH2O2sensing

“…[ 18–20 ] Metal complexes are a kind of crystalline materials composed of metal ions and organic ligands with coordination bonds, which not only has easily adjustable structure but also a high degree of purity. [ 21–23 ] Metal ions as active centers perform a vital function in the electrocatalytic activity of complexes. [ 24 ] Compared with other metals ions, the Ag(I) d 10 metal ions are larger in size (1.05 Å) and exhibits a variety of coordination numbers ranging from 2 to 6, even 7 and 8, leading to Ag(I) complexes capable to form electrocatalytic active sites with various coordination geometries from linear to T‐shaped, square‐pyramidal, tetrahedral, trigonal‐bipyramidal, and octahedral.…”