Table 2. Magnetic Relaxation Parameters for 1-Ln, 2-Ln, and 3-Lna.
| complexes | Ueff (K) | log[τ0] (s) | log[C] (s–1 K–n) | n | log[τQTM] (s) |
|---|---|---|---|---|---|
| 1-Tbb (1500 Oe) | 491 ± 32 | –8.97 ± 0.37 | –1.81 ± 0.06 | 3.05 ± 0.05 | |
| 1-Dyb (0 Oe, slow) | 800 ± 16 | –11.80 ± 0.18 | –5.36 ± 0.09 | 4.50 ± 0.07 | 1.47 ± 0.02 |
| 1-Dyb (0 Oe, fast) | –4.36 ± 0.14 | 6.14 ± 0.12 | |||
| 2-Tbb (1500 Oe) | 725 ± 21 | –8.91 ± 0.16 | –2.34 ± 0.04 | 2.95 ± 0.03 | |
| 2-Dyb (0 Oe) | –2.14 ± 0.14 | 3.57 ± 0.09 | –1.26 ± 0.11 | ||
| 3-Tbb (0 Oe) | 1920 ± 91 | –10.93 ± 0.35 | –17.10 ± 1.96 | 9.52 ± 1.06 | 0.51 ± 0.02 |
| 3-Tbb (1500 Oe) | 1920d | –11.03 ± 0.04 | –7.63 ± 0.24 | 4.39 ± 0.16 | 3.25 ± 0.08 |
| 3-Tbc (0 Oe) | 1920d | –10.84 ± 0.04 | –14.84 ± 1.33 | 8.26 ± 0.72 | 1.02 ± 0.03 |
| 3-Dyb (0 Oe) | 1964 ± 48 | –11.10 ± 0.20 | –1.71 ± 0.02 | ||
| 3-Dyb (1000 Oe) | 1964d | –11.16 ± 0.03 | –4.28 ± 0.09 | 1.82 ± 0.06 | |
| 3-Dyc (0 Oe) | 1964d | –10.92 ± 0.04 | –1.44 ± 0.03 | ||
| 3-Dyc (1000 Oe) | 1964d | –10.94 ± 0.03 | –6.05 ± 0.12 | 2.58 ± 0.08 |
a
Obtained from fitting ac and dc
relaxation data with CC-FIT259,60 using the equation 
to define the temperature dependence of
the relaxation time τ–1, where Ueff is the effective barrier to magnetic reversal, τ0 is the attempt time of the phonon bath, C and n define Raman relaxation, and τQTM is the QTM time scale.
b
Crystalline samples.
c
Solution samples.
d
Parameter value was fixed during fitting.