Photoelectron Spectroscopy of Benzoquinonide and Dehydrobenzoquinone Anions
نویسندگان
چکیده
The 364 nm photoelectron spectra of the dehydrobenzoquinone (1•-) and benzoquinonide (2-) anions are reported. For 1•-, the unambiguous assignment of the origin peak yields an electron affinity (EA) of 1.859 ( 0.005 eV. Several vibrational modes of 1 are also reported. Another minor feature at higher electron binding energy is also observed in the spectrum of 1•-. This band does not contain any resolvable peaks and only the vertical detachment energy could be obtained. This is the first time dehydrobenzoquinone, the benzyne analogue of p-benzoquinone, is observed and characterized. The photoelectron spectrum of 2shows no resolvable structure. The origin peak could not be assigned unequivocally because of the small Franck-Condon factor for the 0-0 transition, but an upper value of 2.18 eV for the EA of 2 was obtained. Ab initio calculations are used to help in the interpretation of the spectra and the results are utilized to simulate them.
منابع مشابه
Structure and Dynamics of Small Molecules and Anions: Negative-ion photoelectron spectroscopy
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