Table 3. Diffusion Coefficients, Hydrodynamic Radii Determined by 1H-DOSY NMR and X-ray Diffraction, Errors between the Measured Radii, Molecular Weights Determined by 1H DOSY NMR (MWDet), Calculated Molecular Weights (MWCal), and Errors in MW between the Calculated and Observed Values for 6–9.
| compound | solvent | D (×10–10 m2 s–1) | RHa | RHb | error (%)c | Dnorm (×10–10 m2 s–1) | MWDet (g mol–1)d | MWCal (g mol–1) | error (%)a |
|---|---|---|---|---|---|---|---|---|---|
| 6 | d8-THF | 5.97 | 7.61 | 6.21 | 22 | 5.26 | 942 | 915/1131 | 3/–17 |
| 7 | C6D6 | 5.08 | 6.70 | 5.79 | 14 | 5.04 | 1241b | 1114 | 11 |
| 8 | C6D6 | 5.03 | 6.77 | 5.97 | 13 | 5.02 | 1014 | 1130 | –10 |
| 9 | C6D6 | 5.05 | 6.74 | 5.90 | 14 | 4.99 | 1024 | 1096 | –6.6 |
As determined by DOSY.
As determined by single-crystal X-ray diffraction studies.
Error = (100 × (RH, DOSY – RH, X-ray)/RH, X-ray) and (100 × (MWdet – MWcal)/MWcal).
MWdet corrected for molecular weight as recommended by Kreyenschmidt et al.,47 with Xcorr = 1.23.