Mn TTHA complexes

When it is impossible to establish the exact protonation state of the com-plex(es) in a specific reaction, or when all complexes in equilibrium over a broad pH range are under discussion, they will be written here as Mn TTHA, Mn TTHA, etc. The reactions of Mn TTHA complexes with H02-02" radicals were studied in solutions containing at least a twofold excess of TTHA to MnS04 and a tenfold excess of formate over TTHA, in order to ensure scavenging of the OH radical by formate and not TTHA. Under these conditions, only the mononuclear complexes described above were formed in significant yield. Studies were not carried out at pH < 2 because preliminary results indicated a complex reaction mechanism, hkely due to many different manganous complexes (various manganous formate complexes, aquo Mn ) in equilibrium. 

Table 11. Equilibrium Constants for the Reactions of 02 /H02 Radicals with Mn TTHA Complexes (pH 3-4.5) and Rate Constants for tbe Subsequent Process at Various pHs...

---