Table 1. The Eight Methods Adopted for Calculating 11B Isotropic Shielding Constants and the Fitted Empirical Scaling Parameters (Slope and Intercept) in THF.
SMDc |
CPCMd |
|||||
---|---|---|---|---|---|---|
method | geometrya (opt & freq) | NMRb (GIAO) | slope | intercept | slope | intercept |
1 | B3LYP/6-31+G(d,p) | mPW1PW91/6-311+G(2d,p) | –1.0869 | 106.19 | –1.0851 | 106.02 |
2 | B3LYP/6-311+G(2d,p) | mPW1PW91/6-311+G(2d,p) | –1.0877 | 106.40 | –1.0867 | 106.25 |
3 | B3LYP/6-31+G(d,p) | PBE0/6-311+G(2d,p) | –1.0959 | 106.32 | –1.0941 | 106.15 |
4 | B3LYP/6-311+G(2d,p) | PBE0/6-311+G(2d,p) | –1.0967 | 106.53 | –1.0956 | 106.37 |
5 | M062X/6-31+G(d,p)g | mPW1PW91/6-311+G(2d,p) | –1.1050 | 106.67 | –1.0903 | 106.65 |
5′ | M062X/6-31+G(d,p)g | mPW1PW91/6-311+G(2d,p) | –1.1170e | 107.52e | –1.1386f | 107.76f |
6 | M062X/6-311+G(2d,p)g | mPW1PW91/6-311+G(2d,p) | –1.1014 | 106.94 | –1.1003 | 106.79 |
7 | B3LYP/cc-pVDZ | B3LYP/cc-pVDZ | –1.0104 | 110.96 | –1.0078 | 110.79 |
7′ | B3LYP/cc-pVDZ | B3LYP/cc-pVDZ | –1.0386e | 111.96e | –1.0442f | 111.80f |
8 | B3LYP/cc-pVTZ | B3LYP/cc-pVTZ | –1.0824 | 103.20 | –1.0823 | 103.09 |
The geometry optimization and vibrational frequency calculations were performed with this method.
The GIAO calculations24 were performed with this method together with the implicit solvent models in Gaussian 09.
The fitted empirical scaling factors (slope and intercept in eq 1) for the chemical shift calculations with the SMD model.32 The linear fitting is shown in Figure 1.
The fitted empirical scaling factors (slope and intercept in eq 1) for the chemical shift calculations with the CPCM model.33 The linear fitting is shown in Figure S2 in the Supporting Information.
The fitted empirical scaling factors (slope and intercept in eq 1) for the chemical shift calculations with the SMD model included in the optimization step. The linear fitting can be seen in Figure S3 in the Supporting Information.
The fitted empirical scaling factors (slope and intercept in eq 1) for the chemical shift calculations with the CPCM model included in the optimization step. The linear fitting can be seen in Figure S3 in the Supporting Information.
int=ultrafine was included in all calculations with the M06 functionals.