Assessment of the Walden constant for calculation of fusion enthalpies, 
of tris(β-diketonato)iron(iii) complexesa.
| Complex |
b, kJ mol−1
|
T fus/Kb, K | Walden constantc, J K−1 mol−1 |
|---|---|---|---|
| Fe(acac)3 | 31.0 ± 0.9 | 459 | 68 ± 2 |
| Fe(tfac)3 | 38.0 ± 5.5 | 389 | 98 ± 14 |
| Fe(hfac)3 | 31.3 ± 3.6 | 329 | 95 ± 11 |
| Fe(thd)3 | 30.8 ± 5.9 | 438 | 73 ± 14 |
| 69 ± 2 d |
a
Uncertainties in this table are expressed as expanded uncertainties at a level of confidence of 0.95 (k = 2).
b
From Table 3.
c
Calculated as follows: Walden constant = 
d
Weighted mean value. We used the uncertainty as the weighing factor.