
TY  - JOUR
A1  - Lincoln, SF 
A1  - Stranks, DR 
T1  - Phosphato complexes of cobalt(III). II. Reversible chelation and ring-opening reactions
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1968
VL  - 21
IS  - 1
SP  - 57
EP  - 65
KW  - 
UR  - https://doi.org/10.1071/CH9680057 
N2  - The bidentate phosphato complex Co en2PO40; has been shown to exist in rapid reversible equilibrium with the monodentate complex Co en2OH.HPO40 A detailed kinetic analysis of the opposed ring-opening and ring-closing (or chelation) reactions has evaluated rate constants for each of the protonated forms in acid and basic media. The ring-opening reaction is subject to both acid and base catalysis. However, within the pH range 6-9, the bidentate form containing a four-member phosphate ring is thermodynamically more stable than the monodentate form. This is ascribed to a rapid chelation reaction arising from a favourable cis hydrogen-bonded transition state. 
ER  -

