CEQUINOR   05415
CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
artículos
Título:
Early barriers in the matrix photochemical formation of syn-anti randomized FC(O)SeF from the OCSe:F2 complex
Autor/es:
JOVANNY A. GÓMEZ CASTAÑO; A. LORENA PICONE; ROSANA M. ROMANO; HELGE WILLNER; CARLOS O. DELLA VÉDOVA
Revista:
CHEMISTRY-A EUROPEAN JOURNAL
Referencias:
Año: 2007 vol. 13 p. 9255 - 9255
ISSN:
0947-6539
Resumen:
The photochemically induced reaction of OCSe and F2, isolated together in an Ar matrix at about 15 K, leads to formation of the hitherto-unknown fluorocarbonylselenyl fluoride FC(O)SeF. The reaction occurs via a van der Waals complex O=C=Se···FF that favors very early formation of the anti conformer. The presence and subsequent decay of a band assigned to the FF vibration correlated with perturbed OCSe bands seems to confirm this hypothesis. Subsequent irradiation of the matrix leads to randomized FC(O)SeF by a photochemically induced conformational equilibrium between syn and anti forms. Another photochemical reaction channel is the formation of CO and SeF2 molecules, which are produced in the same matrix cage and then form a loose complex. The changes were monitored and the products characterized experimentally by their IR spectra, and the spectra analyzed in the light of the results of theoretical calculations.