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Ligand Effects on the Kinetics of the Reversible Binding of NO to Selected Aminocarboxylato Complexes of Iron(II) in Aqueous Solution
Author(s) -
Schneppensieper Thorsten,
Wanat Alicja,
Stochel Grazyna,
Goldstein Sara,
Meyerstein Dan,
van Eldik Rudi
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200109)2001:9<2317::aid-ejic2317>3.0.co;2-f
Subject(s) - chemistry , reaction rate constant , radiolysis , flash photolysis , aqueous solution , kinetics , dissociation (chemistry) , photodissociation , potentiometric titration , temperature jump , dissociation rate , inorganic chemistry , photochemistry , physics , electrode , quantum mechanics
Rate constants for the formation and dissociation of Fe II (L)NO (L = aminocarboxylato) have been determined using stopped‐flow, temperature jump, flash photolysis, and pulse radiolysis techniques. For a series of ligands the formation rate constants vary between 1.6 × 10 6 and 2.4 × 10 8 M −1 s −1 , whereas the dissociation rate constants vary between 0.11 and 3.2 × 10 3 s −1 at 25 °C. These rate constants result in stability constants ( K NO = k f / k d ) ranging from 5.0 × 10 2 to 1.1 × 10 7 M −1 , which are in good agreement with values of K NO determined by a combined spectrophotometric and potentiometric technique. The results are discussed with reference to available literature data, and interpreted in terms of a generalized reaction mechanism.