Table 2.
Thermodynamic parameters ΔH (kJ mol−1), ΔS (J mol−1 K−1), ΔG and ΔG′a (kJ mol−1) for 1 and 2 from van’t Hoff analysis at 25 °C
| solvent | ΔH | ΔS | ΔG | ΔG′a |
|---|---|---|---|---|
| DMSO-d6 | −31.2(7) | −81(2) | −6.98(3) | −6.6(3) |
| DMF-d7 | −30.8(4) | −80(1) | −6.90(2) | −4.8(2) |
| Acetonitrile-d3 | −28(3) | −73(8) | −6.0(5) | −4.5(3) |
| THF-d8 | −14(1) | −40(4) | −1.6(1) | −1.2(4) |
| chloroform-d | −9(2) | −35(9) | 1.5(5) | 2.2(3) |
| DMSO-d6 (2)b | −24(2) | −65(7) | −4.9(1) | −5(2) |
a
ΔG′ values are calculated from Keq constants in Table 1 at 25 °C.
b
Parameters for 2 were obtained only in DMSO-d6 due to convolution of signals in all other solvents.