Vanadyl tetradentate Schiff base complexes as catalyst for C–H bond activation of olefins with tert-butylhydroperoxide: Synthesis, characterization and structure

Chiral recognition of Schiff bases by 15N NMR spectroscopy in the presence of a dirhodium complex. Deuterium isotope effect on 15N chemical shift of the optically active Schiff bases and their dirhodium tetracarboxylate adducts

“…[25] For compounds 8 and 9, large negative values of chemical shift, as well as a large value of 1 J(N,H) = 89 Hz at 230 K for 9, are typical of the pure NHform. [15,17,31] Larger changes in the 15 bases (3)(4)(5)(6)(7). These changes in the 15 N chemical shifts, as well as the values of coupling constants 1 J(N,H) measured for some compounds (Table 1), indicated the presence of proton-transfer equilibrium.…”

Metallation of tetradentate N2O2 Schiff base with Mn(II), Co(II), Cu(II) and Zn(II): synthesis, characterization and formation constants measurement

“…Salicylaldehyde, 5-methoxysalicylaldehyde, 5-bromosalicylaldehyde, 4 , methanol, chloroform, dichloromethane, dimethylformamide were purchased from Merck, Fluka, Aldrich or Acros and used without further purification.…”

“…For example, the 5-OMe substituted ligand has the tendency to act as a good σ-donor as a result of the high electron releasing power of the OMe groups in the para position in HL 1 relative to that of the non-substituted HL 2 and electron-withdrawing groups in para position HL 3 , HL 4 . The withdrawing functional groups makes the Schiff base a poor donor ligand and decreases the formation constants while the electron donor group increases the formation constants.…”

“…Schiff bases are very important tools for the inorganic chemists as these are widely used in designing molecular ferromagnets [1,2], in catalysis [3,4], in biological modeling applications [5,6], and as liquid crystals [7,8]. Schiff base complexes are once again topical in connection with self-assembling cluster complexes [9][10][11][12][13][14][15].…”

Synthesis, Characterization, Electrochemical and Antimicrobial Activity of Macrocyclic Binuclear Cu(II), Ni(II) and VO(II) Schiff Base Complexe

“…Schiff bases are an important class of ligands in coordination chemistry and find extensive applications in different fields. Schiff bases and their biologically active complexes have been often used as chelating ligands in the coordination chemistry of transition metals, radiopharmaceuticals for cancer targeting 3 , agrochemicals 4 , model systems for biological macro molecules 5 , catalysts 6 and as dioxygen carriers 7 .…”