The corrosion inhibition of mild steel in 1N sulphuric acid containing various concentrations of indole was studied in the temperature range of 25-70 "C through the use of potentiodynamic polarization curves. The indole was found to shift the corrosion potentials to positivc values and to decrease the dissolution of mild steel and hydrogen evolution rcaction. The effect, however, was more pronounced on the anodic rathcr than the cathodic process. lndolc did not generally affect the corrosion reaction mechanism (blocking cffect). The reported activation energy (E,) values indicate that the inhibiting effect increased with the indolc concentration. At temperatures of 25, 40. 55 and 70°C the adsorption behaviour of the indole followsTcmkin's isotherm with a standard free energy of adsorption of -54.49, -39.41, -43.49 and -55.25 kJ/mol, respectively. Die Inhibition der Korrosion von unlcgicrtem Stahl in 1N Schwefelsiiure durcti verschiedene Gehalte an Indol wurde im Tcmpcraturbereich von 25 "C his 70 "C mittels potentiodynamischer Polarisationskurven untersucht. Die Zugabe von Indol verschiebt das Korrosionspotential zu positiven Werten und verringert die Aufl6sung des unlegierten Stahls und die Wasserstoffcntwicklung. Die Wirkung des Indols war jedoch im anodischen Bereich ausgcprlgter als im kathodischen. Indol beeinflu& nicht allgemein den Korrosionsreaktionsmechanismus. Die ermittelten Werle cur die Aktivieruiigsenergie (E,) dcuten an, da13 die inhibicrende Wirkung mit der Indolkonzentration ansteigt. Bei Temperaturcn von 25, 40, 55 und 70°C folgt das Adsorptionsverhalten des lndols dcr Tcmkin-Isotherme mit einer freien Standardadsorptionsenergie von -54,49, -39.41. -43,40 bzw. -55,25 kJimol.
The synthesis and characterization of new hydroxo-bridged platinum(II) complexes of the
type [P(μ-OH)(P−P)]2[BF4]2 (1−4), where P−P = (C6H5
-
n
F
n
)2PCH2CH2P(C6H5
-
n
F
n
)2 (n = 2
(2Fdppe) (1), 3 (3Fdppe) (2), 4 (4Fdppe) (3), 5 (dfppe) (4), are reported. These compounds
have been used in the Baeyer−Villiger oxidation of 2-methylcyclohexanone using 35%
hydrogen peroxide as oxidant. The reactions were performed at 25, 50, and 70 °C in a
chlorinated solvent/H2O two-phase system. Among the fluorinated catalysts, complex 4 was
found to be the best one in the oxidation of cyclic ketones; however, it is ineffective toward
acyclic ketones. The Lewis acidity of the platinum(II) complexes with coordinated fluorinated
diphosphines was investigated through the determination of the wavenumber shift Δν̄ =
ν̄(C⋮N)coord − ν̄(C⋮N)free of the isocyanide group in complexes of the type [PtCl(CN-2,6-(CH3)2C6H3)(P−P)][BF4] (P−P = 2Fdppe, 3Fdppe, 4Fdppe, dfppe, dppe). This latter parameter, which represents a measure of the electrophilicity of the metal center, was then
correlated to the catalytic activity of complexes 1−4 in the Baeyer−Villiger oxidation of
ketones.
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