Table 1.
Logarithms of overall formation constants in the CoII(Himid)(L-α-Amac)nH2O system and UV–Vis parameters
| System | m | l | l′ | h | Refinement results (log10 β mll′h) | σ b | λ max (ε) nm (L mol−1 cm−1) |
|---|---|---|---|---|---|---|---|
| Co(H2O)2+ a6 | 1 | 0 | 0 | −1 | −8.45(3) | 512 (5) | |
| Imidazolea | 0 | 0 | 1 | 1 | 7.28(1) | 2.89 | |
| 1 | 0 | 1 | 0 | 2.82(2) | 1.49 | 514 (6) | |
| 1 | 0 | 2 | 0 | 4.94(2) | 506 (16) | ||
| 1 | 0 | 3 | 0 | 6.76(9) | 491 (38) | ||
| 1 | 0 | 4 | 0 | 8.29(13) | |||
| 1 | 0 | 5 | 0 | 9.68(14) | |||
| Alaninea | 0 | 1 | 0 | 1 | 9.75(1) | 4.59 | |
| 0 | 1 | 0 | 2 | 12.13(1) | |||
| 1 | 1 | 0 | 0 | 4.20(1) | 5.70 | 508 (8) | |
| 1 | 2 | 0 | 0 | 7.65(1) | 491 (11) | ||
| 1 | 3 | 0 | 0 | 9.92(1) | 500 (19) | ||
| 1 | 1 | 1 | 0 | 6.97(2) | 1.32 | 505 (15) | |
| 1 | 2 | 1 | 0 | 9.94(4) | 495 (20) | ||
| Asparagine | 0 | 1 | 0 | 1 | 8.66(1) | 5.99 | |
| 0 | 1 | 0 | 2 | 10.96 (1) | |||
| 1 | 1 | 0 | 0 | 4.25(1) | 3.47 | 507 (8) | |
| 1 | 2 | 0 | 0 | 7.67(1) | 485 (10) | ||
| 1 | 3 | 0 | 0 | 9.23(1) | 500 (17) | ||
| 1 | 1 | 1 | 0 | 6.89(1) | 2.17 | 503 (20) | |
| 1 | 2 | 1 | 0 | 9.70(1) | 491 (22) |
Temp. 25.0 ± 0.1 °C, I = 0.5 mol L−1 (KNO3). Programs: Hyperquad 2008 and HypSpec. Standard deviations at the last decimal points—in parentheses. β mll’h = [MmLlL′l′Hh]/[M]m[L]l[L′]l′[H]h, where M = Co(II), L = AmacH-1, L′ = Himid, H = proton
a Results for Co(H2O)2+6, Ala and Imidazole taken from previous paper [8]
b σ statistical residual parameter of Hyperquad [27]