Xu Y, Tzeng SY, Zhang B, Tzeng WB. Rotamers of 3,4-difluoroanisole studied by two-color resonant two-photon mass-analyzed threshold ionization spectroscopy.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013;
102:365-370. [PMID:
23220679 DOI:
10.1016/j.saa.2012.10.020]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 10/15/2012] [Indexed: 06/01/2023]
Abstract
We reported the vibronic and cation spectra of 3,4-difluoroanisole. The band origins of the S(1) ←S(0) electronic transition of the cis and trans rotamers appear at 35,505 ± 2 and 35,711 ± 2 cm(-1) and the adiabatic ionization energies are determined to be 67,780 ± 5 and 68,125 ± 5cm(-1), respectively. Most of the observed active vibrations in the electronically excited S(1) and cationic ground D(0) states mainly involve in-plane ring deformation and substituent-sensitive bending vibrations. Analysis of the obtained vibronic and cation spectra suggests that the molecular geometry, symmetry, and vibrational coordinates of the cation in the D(0) state are like those of the neutral species in the S(1) state for these two isomeric species.
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