Thermodynamic Investigation and Mixed Ligand Complex Formation of 1,4-Bis-(3-aminopropyl)-piperazine and Biorelevant Ligands

Table 2

Stepwise stability constants for the complexation of (BAPP) with 3d divalent metal ions in aqueous solution at 0.1 M NaNO₃ at different temperatures.

Cations	log𝐾^a
	20°C	25°C	30°C	35°C
ZnL	4.74 (0.06)	4.64 (0.08)	4.55 (0.08)	4.47 (0.07)
CoL	5.59 (0.02)	5.35 (0.09)	5.12 (0.06)	4.88 (0.10)
NiL	5.88 (0.04)	5.61 (0.02)	5.33 (0.03)	5.06 (0.02)
CuL	14.26 (0.02)	13.81 (0.01)	13.42 (0.05)	13.09 (0.07)

^aStandard deviations are given in parentheses, L: BAPP.