Photoionization studies on Thionitrites

ANTONELA CANNEVA; MAURICIO ERBEN; ROSANA ROMANO; GE MAOFA; CAVASSO FILHO, R. L.; CARLOS OMAR DELLA VEDOVA

Campinas

Encuentro; 25th Annual Users? Meeting (RAU); 2015

LNLS CNPEM

Photoionization studies on ThionitritesPresenter: Canneva A.Nitric oxide (NO) has been recognized as a fundamental molecule in biology and medicine.Among them, S-nitrosothiols, RSNO, have been shown to store, transport, and release NOwithin the mammalian body(1). It has been suggested that the formation and decay of lowmolecular weight RSNOs, such as S-nitrosoglutathione and S-nitrosocysteine, also representa mechanism for the storage or transport of NO.(2) The determination of the electronicproperties of simple thionitrites is an important task, because their serve as a modelcompounds for more complexes species, especially in connection with the previouslydescribed biological importance. The main objective was the determination of theirmolecular and electronic properties. Thus, depending on their chemical stability, differentapproaches have been applied, including Gas Electron Diffraction and vibrationalspectroscopy techniques. Moreover, the gas phase He(I) photoelectron spectrum (PES) of tBuSNOhas been measured. Here, we present the results of studies on the shallow-coreelectronic levels of thionitrites species (CH3)2CHSNO and (CH3)3CSNO. The dissociationprocess that dominates the RS?NO photolysis is mostly influenced by the electronicdistribution around the sulfur atom as we conclude of the analysis to the sulfur 2p level,which could be studied by using the TGM beamline.(1) Stamler, J. S.; Jaraki, O.; Osborne, J.; Simon, D. I.; Keaney, J.; Vita, J.; Singel, D.; Valeri, C. R.; Loscalzo, J. PNAS 1992, 89, 7674-7677. (2) Gaston, B.; Reilly, J.; Drazen, J. M.; Fackler, J.; Ramdev, P.; Arnelle, D.; Mullins, M. E.; Sugarbaker, D. J.; Chee, C.; Singel, D.J. Proc. Natl. Acad. Sci. 1993, 90, 10957-10961.