Abstract
The binding characteristics of number of axial aliphatic amines ligands were studied with Fe(ll)TPPS4 complex in aqueous solutions at hiqh PHs > 12.5 . All formed low spin octahedral complexes . Electronic absorption , ΔH , ΔG , and ΔS of these complexes have been reported and Calculated . The Path way for the axial ligation on addition of ligand to Fe(ll)TPPS4 is shown in one step . Hill Plots used to obtain the formation constants ( KF) and ( n ) number of axial ligands bonded to the iron(ll) ion . It has been found low values of the KF for these ligands comparing to those recorded in organic solvents may be due to the polar solvent , and these values ( KF) more higher than that recorded for aromatic amine with the same complex and solvents due to steric effect of the size of porphyrin ring .
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