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Kinetics of complexation of nickel(II) in Nonaqueous solvents with some azo-dyes

✍ Scribed by M. Cusumano

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 543 KB
Volume: 25
Category: Article
ISSN: 0020-1693
DOI: 10.1016/s0020-1693(00)95714-1

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✦ Synopsis

The kinetics of reactions of nickel(D) with 2-(4dimethylaminophenilazo)pyridine (DPAP) in methanol, dimethylformamide and dimethylsulphoxide and with 4-(2-pyridylazo)resorcinol (PAR) and l-(2pyridylazo)2-naphthol (PAN) in dimethylsulphoxide have been investigated. The rate constants kt (25 "C) for

Nirr-DPAP reaction in the solvents used are 3.6 X IO3 M-' set-r, 4.4 X lo3 M-' set-r and 7.9 X IO2 M-r set-' respectively. The rate constants kt (25 "C) for Nil'-PAR and Nirr-PAN reactions are 8.0 X lo2 M-r set-' and 0.6 X 1 O2 M-r set-' respectively.

The low value of kt for Nil'--Pm and b/i"-PAR reactions in dimethylsulphoxide is interpreted assuming that the process is governed by a sterically controlled mechanism. The values of activation parameters AH' and AS* for the reactions investigated are correlated through an isokinetic relationship.

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