Abstract: Ab initio ROHF, CASSCF, UMP2, and DFT/B3LYP calculations using the standard 6-31G* basis set have been done to study potential energy surfaces (PESs) of selected fluorobenzene radical cations. The stationary PES points have been located, their types and interrelations have been established, and the PES sections have been constructed. The points of conical intersection of pi terms have been determined at the ROHF and CASSCF levels of calculations. An opposite behavior of the intersection point at the increase of calculation level has been revealed for C6H5F+ and 1,3-F2C6H4+ cations, and for the 1,2,3-F3C6H3+ cation. In the first case, the intersection point has a tendency to shift to the structure of maximum energy and may disappear at a higher level of calculation. However, the intersection is retained in the case of 1,2,3-F3C6H3+, which results in the pseudorotational structure of the PES. A low barrier for pseudorotation found for the 1,2,3-trifluorobenzene radical cation points out the possibility of revealing the pseudo-rotation in experimental ESR spectra. (C) 2004 Wiley Periodicals, Inc.

Cite: Vysotsky V. , Salnikov G. , Shchegoleva L.
Potential energy surfaces of fluorinated benzene radical cations
International Journal of Quantum Chemistry. 2004. V.100. N4. P.469-476. DOI: 10.1002/qua.20013 WOS Scopus

Identifiers:

Web of science	WOS:000224637400020
Scopus	2-s2.0-7544225498
OpenAlex	W2063270855

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