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Kinetics and Mechanism of Reduction of p-Nitroso-N,N-dimethylaniline by Sulphite lons in Acetate-Acetic Acid Buffer Solutions

Maher M. Girgis ; Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt


Puni tekst: engleski pdf 2.865 Kb

str. 441-448

preuzimanja: 374

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Sažetak

The kinetics of the title reduction was studied spectropho-:
tometrically in acetate-acetic acid buffer solutions at different
temperature s in the range 20 ° to 40 aC. The effect of varying
[H+] on the reduction rate was investigated at a constant ionic
strength of 0.06 mol md". The rate-order was found to be 1.0
with respect to both reactants and -0.5 with respect to the hydrogen
ion. The rate of reaction decreased with increasing hydrogen
ion concentrations. The [H+] dependency indicates the presence
of two competitive rate-determining steps. The experimental data
gave a good fit to
-d[nitroso compoundj/dt = kobs [nitroso compound]
= [nitroso compound] [sulphite]
kaKJ + kbK2Kp [H+] •
1 + Kp [H']
Activation parameters were determined and found to be L'l.S=l==
-176.09 JK-l mol-i, L'l.H=l== 17.82 kJ mol" and L'l.G=l== 70.30 kJ
mol-I. A mechanism consistent with the experimental results has
been suggested.

Ključne riječi

Hrčak ID:

175802

URI

https://hrcak.srce.hr/175802

Datum izdavanja:

10.10.1989.

Posjeta: 665 *