Premium
Die Kinetik der Murexid‐Komplexbildung mit Kationen verschiedenen Koordinationscharakters
Author(s) -
Geier G.
Publication year - 1968
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19680510111
Subject(s) - chemistry , reaction rate constant , metal , lanthanide , kinetics , equilibrium constant , inorganic chemistry , metal ions in aqueous solution , temperature jump , ion , organic chemistry , physics , quantum mechanics
The kinetics of the reaction of murexide with different divalent metal ions of class A and B have been measured by the temperature‐jump‐relaxation method. The second‐order formation rate constant increases in the sequence Ni 2+ < Co 2+ < Mn 2+ < Zn 2+ < Cd 2+ ˜ Cu 2+ ˜ Ca 2+ < Sr 2+ < Ba 2+ < Pb 2+ . Thermodynamic data obtained from kinetic and equilibrium studies, respectively, are in good agreement. The results are compared with the characteristic rate constants for H 2 O‐exchange in the inner coordination sphere of these metal ions, which follow the same sequence. The rate constants of the reaction of murexide with various trivalent metal ions, including the lanthanides, are also discussed in terms of current ideas on metal complex formation.