Table 10 Experimental data of the apparent stability constants of Co (II), Ni (II), Cu (II), Zn (II) chelates with PAP azo-dyes (Ia and lb)
Metal | Method | Ia | Ib | ||||||
|---|---|---|---|---|---|---|---|---|---|
n = 1 | n = 2 | n = 1 | n = 2 | ||||||
Log \({\beta }_{1}\) | − ΔG \(^\circ\) k.Cal.mol−1 | Log \({\beta }_{1}\) | − ΔG \(^\circ\) k.Cal.mol−1 | Log \({\beta }_{1}\) | − ΔG \(^\circ\) k.Cal.mol−1 | Log \({\beta }_{1}\) | − ΔG \(^\circ\) k.Cal.mol−1 | ||
Co(II) | MR | 5.20 | 7.14 | 10.20 | 14.00 | 5.08 | 6.97 | 9.30 | 12.76 |
CV | 5.07 | 6.96 | 10.70 | 14.60 | – | – | 9.40 | 12.90 | |
Ni(II) | MR | 5.03 | 6.96 | 10.30 | 14.14 | 5.10 | 7.00 | 9.50 | 13.40 |
CV | 5.20 | 7.14 | 10.48 | 14.38 | – | – | 9.90 | 13.59 | |
Cu(II) | MR | 5.80 | 7.96 | 10.70 | 14.69 | – | – | 10.60 | 14.55 |
CV | – | – | 10.05 | 13.79 | 5.19 | 7.12 | 10.40 | 14.27 | |
Zn(II) | MR | 5.10 | 7.00 | 10.50 | 14.41 | 5.10 | 7 | 9.90 | 13.59 |
CV | 5.20 | 7.14 | 10.06 | 13.81 | 5.16 | 7.08 | 9.50 | 13.04 | |