Tribochemically active chelate complexes of salicylideneimines
摘要:
N-Alkylsalicylideneimines and their complexes with 3d metals were obtained by chemical (from metal salts) and electrochemical methods (from metals in the zero oxidation state). The compounds obtained were characterized by IR and H-1 NMR spectroscopy and X-ray diffraction analysis. According to crystallographic data, nickel bis(chelate) exists in the trans-planar configuration. A friction test revealed that the tribotechnical characteristics of lubricating formulations are substantially enhanced in the presence of N-alkylsalicylideneiminates.
Dynamic stereochemistry of bis-salicylaldimine chelate complexes of metals of II group
作者:Antonino Recca、Francesco A. Bottino、Paolo Finocchiaro
DOI:10.1016/0022-1902(80)80072-8
日期:1980.1
Bis(salicylaldimine) complexes of Zn, Mg and Ca have been prepared and their variable-temperature 1H-NMR spectra have been investigated in order to ascertain the stereochemistry in solution of these bis-chelates. The introduction of prochiral groups in such complexes permitted measurements of the activation energy for the enantiomerization process in the Zn derivative (ΔG19≠ = 15.5 kcal/mol); for the