CEQUINOR   05415
CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
artículos
Título:
Outermost and Inner-Shell Electronic Properties of ClC(O)SCH2CH3 Studied Using HeI Photoelectron Spectroscopy and Synchrotron Radiation
Autor/es:
L. R. PIRANI, M. F. ERBEN, M. GERONÉS, CHUNPING MA, M. GE,R. M. ROMANO, R. L. CAVASSO FILHO, Y C.O. DELLA VÉDOVA
Revista:
JOURNAL OF PHYSICAL CHEMISTRY A
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2010
ISSN:
1089-5639
Resumen:
A study of valence electronic properties of S-ethyl chlorothioformate (S-ethyl chloromethanethioate), ClC(O)SCH2CH3, using HeI photoelectron spectra (PES) and syn-chrotron radiation is presented. Moreover, the photon impact excitation and dissociation dynamics of ClC(O)SCH2CH3 excited at the S 2p and Cl 2p levels are elucidated by analyzing the total ion yield (TIY) spectra and time-of-flight mass spectra acquired in multicoincidence mode [photoelectronphotoion coincidence (PEPICO) and photoelectronphotoionpho-toion coincidence (PEPIPICO)]. The HeI photoelectron spectrum is dominated by features associated with lone-pair electrons from the ClC(O)S— group, the HOMO at 9.84 eV being assigned to the nπ(S) sulfur lone-pair orbital.Whereas the formation of C2H5þ ion dominates the fragmentation in the valence energy region, the most abundant ion formed in both the S and Cl 2p energy ranges is C2H3þ. Comparison with related XC(O)SR (X = H, F, Cl and R =—CH3,—C2H5) species reveals the impact of the alkyl chain on the photodissociation behavior of S-alkyl (halo)thioformates.
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