Cbemical ionization mpss spectra of halomethanes measured using tetramethylsiiaw as reagent gas exhibit three major peaks corresponding to [ M + SiMe,l\*, IM -XI + and (MeSi)lX+ ions (X = C1, Br or I). Dihalomethaws CH,X, form tbe most stable silylated molecular iom, whereas in the mass spectra of t
Chemical ionization mass spectrometry of halogenoalkanes with tetramethylsilane as reagent gas
โ Scribed by Oleg S. Chizhov; Valentin I. Kadentsev; Andrei A. Stomakhin
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 314 KB
- Volume
- 26
- Category
- Article
- ISSN
- 1076-5174
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โฆ Synopsis
Chemical ionization mass spectra of halogenoalkanes (RX) obtained using tetramethylsilane as reagent gas show two major peaks corresponding to the cluster ion RX+SiMe3 and alkyl ion R+. Iodides exhibit the highest affinity toward the trimethylsilyl ion and produce the most stable silylated molecular ions, whereas bromides and especially chlorides are less reactive toward Me$+ ions and form less stable [ M + SiMe,] + ions.
๐ SIMILAR VOLUMES
The tetramethylsilane (TMS) chemical ionization (CI) spectra of the mono-substituted aromatics studied contain M+' and adduct [M + (CH, 1, IS]' ions. Abundant M+' ions are observed in compounds with electrondonating groups and are attributed to charge-exchange reactions of reactant ions in the TMS C
The tetramethylsilane (TMS) chemical ionization (CI) mass spectra of some geometrical isomers of unsaturated dicarboxylic acids, esters and isomeric phthalic acids reveal explicit differences. The (@-acids show an abundant [ M + 73 -CH,I + ion whereas the (a-acids exhibit a strong [ M + 73 -H,OJ + i