Stability Constants of Mixed Ligand Complexes of Nickel(II) with Adenine and Some Amino Acids

Table 1

The protonation constants of the ligands at 25.0 ± 0.1°C, = 0.1 mol·L⁻¹ KNO₃.

Ade(A)	9.60 ± 0.06	4.18 ± 0.07
	9.60 [24]	3.90 [24]
	9.62 [25]	4.20 [25]
	9.92 [26]	4.19 [26]
L-Asp(B)	9.61 ± 0.03	3.74 ± 0.03	2.00 ± 0.03
	9.64 [25]	3.70 [25]	1.98 [25]
	9.82 [27]	3.86 [27]	2.10 [27]
	9.48 [28]	3.87 [28]	2.48 [28]
L-Glu(B)	9.57 ± 0.05	4.16 ± 0.05	2.19 ± 0.05
	9.58 [25]	4.14 [25]	2.16 [25]
	9.41 [27]	4.15 [27]	2.65 [27]
	9.98 [29]	4.37 [29]	2.05 [29]
L-Asn(B)	8.78 ± 0.02	2.17 ± 0.02
	8.73 [25]	2.16 [25]
	8.45 [24]	1.70 [24]
L-Leu(B)	9.52 ± 0.05	2.31 ± 0.05
	9.56 [25]	2.34 [25]
	9.58 [30]	2.32 [30]
L-Phe(B)	9.14 ± 0.07	2.19 ± 0.07
	9.10 [25]	2.18 [25]
	9.75 [31]	2.14 [31]
L-Trp(B)	9.38 ± 0.03	2.31 ± 0.03
	9.33 [25]	2.28 [25]
	9.14 [32]	2.22 [32]

Uncertainties are expressed as ± one standard deviation.