Journal
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM
Volume 718, Issue 1-3, Pages 55-69Publisher
ELSEVIER
DOI: 10.1016/j.theochem.2004.12.017
Keywords
carbonyl molecules; excited state equilibrium geometry; excited state vibrational frequencies; Ab initio methods; CASSCF
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The equilibrium geometries of the singlet and triplet n -> pi(*), pi -> pi(*) and sigma - pi(*) valence states of the formaldehyde, acetaldehyde and acetone molecules have been obtained performing a full geometry optimization at the single state CASSCF level. The harmonic vibrational frequencies have been computed analytically at the same level of theory. A common strategy for the various states and molecules has been used in order to allow the comparison of the results. The geometrical structure and the harmonic frequencies of two states of acetaldehyde (S-2 and (3)(sigma ->pi*)) and two of acetone (3 sigma -> pi*) and (3)(sigma ->pi*)) are described for the first time. For the 3(sigma -> pi*) state of formaldehyde the first determination of the harmonic frequencies is reported. The strategy here adopted has allowed the identification of various trends for the substitution, on the carbonyl chromophore, of the hydrogen atom with the methyl group. (c) 2004 Elsevier B.V. All rights reserved.
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