Table 5. Statistical Analysis of Relative Energies ΔE , ν1 and ν3 Torsions, and Pseudorotation Parameters Pθ and Ar Evaluated at Stationary Points (MIN1, MIN2, TS1, and TS2) Calculated with Corrected Semiempirical Methods and DFT Methodsa.
DFTB3+Ecorr |
AM1/d+Ecorr |
B3LYP |
|||||||
---|---|---|---|---|---|---|---|---|---|
n | mse | mue | n | mse | mue | n | mse | mue | |
ΔE (kcal/mol) | 28 | –0.09 | 0.23 | 28 | –0.01 | 0.16 | 26 | –1.04 | 1.13 |
ν1,ν3 (deg) | 56 | 0.38 | 2.01 | 56 | 0.77 | 2.38 | 52 | –0.84 | 4.24 |
Pθ (deg) | 26 | 1.68 | 4.83 | 26 | 1.94 | 5.30 | 25 | –0.97 | 9.13 |
Ar (deg) | 28 | 1.50 | 1.51 | 28 | 1.77 | 1.85 | 26 | –1.60 | 2.56 |
“n” is the number of points used to generate the statistics. The phase angles of TS2 of pyrimidine deoxyribonucleosides are not included in the statistics because when their amplitudes of puckering are very small, these phase angles are sensitive to perturbation.