26194-23-0Relevant articles and documents
Kinetics of Ligand Substitution in Bis(N-t-butylsalicylideneiminato)-copper(II): Aprotic Organic Solvents as Media
Elias, Horst,Froehn, Uwe,Giegerich, Gabriele,Stenger, Monika,Wannowius, Klaus J.
, p. 577 - 582 (1982)
Stopped-flow spectrophotometry has been used to study the kinetics of ligand substitution in the title complex tsaln)2> with N-ethylsalicylideneimine in a variety of aprotic organic solvents.The rate of substitution follows a two-term rate law, rate = (k0 + Kligand)complex>, with the substitution of the first ligand being rate controlling.It is shown that the ligand-independent rate term k0 represents the sum of the genuine solvent contribution kS' of a water contribution (kH2OI + kH2OII2), and of contributions caused protic admixtures such as methanol, e.g.kMeOH.The investigation of the dependence K0 = f() reveals that for toluene and carbon tetrachloride KS = 0.The kS values obtained for the aprotic solvents dimethylformamide, dimethylacetamide, tetramethylurea, dimethyl sulphoxide, acetonitrile, nitromethane, and pyridine lie in the range E-4-E-2S-1.Their correlation with solvent parameters such as dielectric constant, donor or acceptor number, fluidity, or Reichardt's ET(30) value is unsatisfactory, whereas the activation energy for the K0 path correlates reasonably well with the heat of vaporization of the solvents.The size of kligand,kMeOH, and especially KH2OI varies with the type of aprotic solvent, the reactivity of water, kH2OI being 2000-fold greater in toluene than in dimethylformamide.Admixtures of 2,4-dimethylpentan-3-ol and 3-ethylpentan-3-ol to carbon tetrachloride act as water scavengers and suppress the water contribution to k0.The mechanism of the various substitution patways induced by the solvent, by water, and by the incoming ligand is discussed.
Tribochemically active chelate complexes of salicylideneimines
Garnovskii,Burlov,Lysenko,Garnovskii,Borodkina,Ponomarenko,Chigarenko,Nikolaevskii,Minkin
, p. 120 - 127 (2009/07/10)
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 1H NMR spectros
Mechanistic information on solvent initiated ligand substitution from kinetic solvent effects and their correlation with the solvent polarity parameter ET(30)
Elias,Wannowius
, p. L157-L158 (2008/10/08)
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