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On the reaction of nickel(II) with thiocyanate ion and other unidentate ligands in dimethylsulfoxide as solvent:I d orD mechanism?

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Abstract

Rate constants and activation parameters for the formation and the dissociation of the monocomplex of nickel(II) with thiocyanate ion in dimethylsulfoxide have been determined by stopped-flow measurements. The results for thiocyanate ion, and also those for several other unidentate ligands, are consistent with a dissociative interchange mechanism in which solvent exchange constitutes the rate-determining step. On the other hand, previous results have shown that for multidentate ligands the ring-closure step also may be rate limiting.

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Coetzee, J.F., Hsu, E. On the reaction of nickel(II) with thiocyanate ion and other unidentate ligands in dimethylsulfoxide as solvent:I d orD mechanism?. J Solution Chem 4, 45–52 (1975). https://doi.org/10.1007/BF00646051

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Key words

  • Kinetics
  • mechanism
  • dimethylsulfoxide
  • complexation
  • nickel
  • thiocyanate
  • stopped-flow