Title

The relaxation spectra of nickel(II) and cobalt(II) arginine complexes

Document Type

Article

Publication Date

1-1-1969

Abstract

The temperature‐jump method has been used to determine the nickel(II)‐ and cobalt(II)‐arginine complexation kinetics. In the pH range studied, the neutral form of the ligand, HL, is the attacking, as well as the complexed, ligand species. The reactions reported on are of the type (Formula Presented.) where n = 1, 2, 3 and M is Ni or Co. At 25° and ionic strength 0.1M the association rate constants are: for nickel(II) k = 2.3 × 10 (±20%), k = 2.4 × 10 (±20%), k = 3.5 × 10 (±40%) M sec ; for cobalt(II) k = 1.5 × 10 (±20%), k = 8.7 × 10 (±20%), k = 2.0 × 10 (±40%) M sec . Arginine binds to metal ions less well than homologous chelating agents due to the electrostatic repulsion arising from the positively charged terminus of the zwitterion. Kinetically, the effect appears in the association rate constants with nickel reactions more strongly influenced than cobalt. Copyright © 1969 John Wiley & Sons, Inc. 1 2 3 1 2 3 3 4 4 −1 −1 5 5 5 −1 −1

Publication Name

International Journal of Chemical Kinetics

Volume Number

1

First Page

45

Last Page

55

Issue Number

1

DOI

10.1002/kin.550010106

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