Structures of Phx (X = O and N) - Importance of Polarization Functions in the Basis Set.
by Liu, R. F.; Zhou, X. F.
The structures of the ground state phenoxy radical and phenylnitrene were calculated by the UNO-CAS method and compared with CAS-SCF results. The two methods produce almost identical structures which are very sensitive to polarization functions in the basis sets. On going from the 3-21 G to the 6-31 G* basis set, the CO and CN distances decrease significantly. Further enlarging the basis set from the 6-31 G* to the 6-311 G(2d, p) has minor effect on the calculated structures. These results indicate that for the correct description of the title compounds, a basis set of at least double zeta plus polarization quality is needed, and one should be cautious about predictions derived from single point calculations on structures obtained with the 3-21 G basis set.
- Journal
- Chemical Physics Letters
- Volume
- 207
- Issue
- 2-3
- Year
- 1993
- Start Page
- 185-189
- URL
- https://dx.doi.org/10.1016/0009-2614(93)87012-r
- ISBN/ISSN
- 1873-4448; 0009-2614
- DOI
- 10.1016/0009-2614(93)87012-r