Thermodynamic studies on the formation of cobalt(II)-adenine nucleotides complexes

Abstract The formation of complexes of Co(II) with adenosine monophosphoric (AMP) and adenosine diphosphoric (ADP) anions have been studied by pH-stat and pH variable potentiometry and also by calorimetry The existence of complexes of type ML (CoAMP and CoADP − , MHL (CoHADP) and ML 2 [Co(ADP) 4- 2 ] is in good agreement with the experimental results. The stability constants of formation of these complexes as well as their corresponding thermodynamic values, obtained in an 0.2 M solution of tetramethylammonium bromide, are presented in the Tables 1, 2 and 3.