STUDY OF THE KINETIC ENERGY RELEASE IN METASTABLE IONS CLEAVAGE FOR N-METHYL p-SUBSTITUTED ARYLSULFONAMIDO THIOPHOSPHORORGANIC DERIVATIVES

Simona Nicoara1, Z. Moldovan2, N. Palibroda2, M. Culea3, O. Cozar3 
and I. Fenesan4

1 Physics Department, Technical University , C. Daicoviciu str. Nr. 15, Cluj-Napoca, Romania, snicoara@phys.utcluj.ro  (author for correspondence)
2 National Institute for Research and Development of Isotopic and Molecular Technologies, Donath str. Nr. 105-107, Cluj-Napoca, Romania
3 Physics Faculty, “Babes-Bolyai” University, M. Kogalniceanu str, Cluj-Napoca, Romania
4 Chemistry Institute, “Raluca Ripan”, Al. Vlahuta str. 110, Cluj-Napoca, Romania

Key words: amidothiophosphonic N-methyl sulfonamides, fragmentation pathways and mechanism, metastable ions cleavage analysis, kinetic energy release

The 70 eV mass spectra and the metastable ions cleavage processes, detected in the HV and MIKE scanning modes, are interpreted for some N-methyl p-substituted arylsulfonamides of the N’-dimethylamidocyclohexyl thiophosphonic acid (1-4), with the molecular structure shown below:

	S	CH3						1. R=F 	(19 amu)
								2. R=Cl 	(35 amu)
cC6H11P	N	SO2	C6H4		R		3. R=CH3 	(15 amu)
								4. R=OCH3 	(31 amu)
	N(CH3)2

The MIKE peak width at 50 % height was used to calculate the amount of kinetic energy released T [1]. The correlation is discussed of the peak shape with the calculated T values and with the fragmentation type, as the relative contribution of the activated complex excess energy E++ and the reverse critical energy Eo r to the total T influence the peak shape [2,3].

REFERENCES

1. Z. Moldovan, N. Palibroda, V. Mercea, G. Mihailescu, Org Mass Spectrom, 20 (1985) 77-86.
2. F W McLafferty and F Turecek, “Interpretation of mass spectra”, University Science Books, Hill Valey (1993).
3. R G Cooks, J H Beynon, R Caprioli and G Lester, “Metastable Ions”, Elsevier, Amsterdam (1973).