Structures, properties and applications of Cu(ii) complexes with tridentate donor ligands

Abstract

Tridentate ligands offer theree donor atoms to coordinate to metal ions. The remaining vacant sites on the metal ions have provided opportunities for coordination chemists to assemble targeted co-ligands with...

Aerobic oxidation of vanillyl alcohol to vanillin catalyzed by air-stable and recyclable copper complex and TEMPO under base-free conditions

“…The bond distances in 1a and 1b are characteristic of similar octahedral Cu(II) complexes. 91,94 Moreover, the solid-state structures of these complexes are stabilized by π⋯π stacking interaction of the aromatic rings in 1a and strong hydrogen bonding interaction among the amine proton, solvated methanol, and perchlorate counter anion in 1b. Complex 2a and 2b crystallized in triclinic and monoclinic crystal systems with P1 ˉand P2 1 /c space groups, respectively.…”

“…98 The bond distances around the metal centers in 2a and 2b are consistent with similar complexes. 94,99 Diverse hydrogen bonds (H⋯Cl) and π⋯π stacking interaction between the pyridine rings of two neighboring molecules gives the solid-state stability in 2a. On the other hand, hydrogen bonding between the amine proton of one molecule and chlorine atom of the neighboring molecule provides additional stability in the solid-state structure of 2b.…”

Experimental and theoretical insights into thetransinfluence of organo-sulfur and -selenium ligands in 5,6-membered palladium(ii) cationic pincer complexes based on iminophosphoranes

“…[18][19][20][21] In addition, coordination complexes with sulfur-based and selenium containing flexible tridentate ligands have been used to model the active sites of metalloproteins or Se containing biomolecules. 22,23 The group of Singh reported a series of flexible tridentate Schiff bases and amine derivatives including different combinations of group 16 donors (S, Se, and Te) and described their Pd(II) unsymmetrical complexes containing 5, 6-membered fused rings, which were found to be promising as catalysts for Suzuki-Miyaura coupling. 24,25 There have been a number of quantum mechanical studies at the DFT level concerning transition metal pincer ligands, to explore the structure, reactivity and spectroscopic properties of the compounds.…”

Nickel(II)-Based Building Blocks with Schiff Base Derivatives: Experimental Insights and DFT Calculations

“…Although the tetradentate chelating Schiff base ligands with the dianionic N 2 O 2 donor set, known as salen-like ligands [29,30], and their corresponding complexes continue to be the most popular and the most studied for their numerous applications (sensing [31], medicine [32,33], catalysis [14,32,34], as synthons for various supramolecular structures [35][36][37]), Schiff base ligand with lower denticity, namely tridentate, are also common [30,38]. Tridentate ligands offer three donor atoms (mostly O, N and S) and act as anionic pincer-type ligand to efficiently chelate the metal ions, thus generating versatile conformationally rigid [M(L A/D )] n+type metalloligands, where L A/D represents electron withdrawing (A) or electron donating (D) tridentate Schiff base ligands.…”