Table 2 The 27Al quadrupolar parameters obtained from the 1D MAS and the 2D MQMAS experiments using the DMFIT program.
Experiment | Isomer | δ iso (ppm) | η Q | χ/MHz |
|---|---|---|---|---|
1D MAS | α-Alq3 | 55.4 ± 1.0 | 0.80 ± 0.04 | 7.0 ± 0.1 |
|  | δ-Alq3 | 43.6 ± 1.0 | 0.18 ± 0.03 | 4.9 ± 0.1 |
|  | Solvated Alq3 | 50.5 ± 1.0 | 0.62 ± 0.04 | 6.4 ± 0.1 |
|  | Solvated Alq3 after the removal of ethanol | 55.1 ± 2.0 | 0.85 ± 0.05 | 6.5 ± 0.3 |
2D MQMAS | α-Alq3 | 54.7 ± 1.0 | 0.85 ± 0.04 | 6.9 ± 0.1 |
|  | δ-Alq3 | 43.1 ± 1.0 | 0.15 ± 0.03 | 5.1 ± 0.1 |
|  | Solvated Alq3 | 50.4 ± 1.0 | 0.60 ± 0.04 | 6.4 ± 0.1 |
|  | Solvated Alq3 after the removal of ethanol | 55.0 ± 2.0 | 0.81 ± 0.04 | 6.9 ± 0.3 |