The actual nature of the ionic intermediates involved in the gas-phase reaction of SiF3+ with water has been ascertained using a Fourier-transform ion cyclotron resonance (FT-ICR) instrument equipped with an external ion source. The complete kinetic pattern following attack of SiF3-x(OH)x+ (x = 0-3) on H-2 O-18 has been investigated, revealing the occurrence of competing H-2 O-18-to-HF and H-2 O-18-to-H-2 O-16 displacement processes, when x = 1 or 2. The factors governing the relative extent of such competing reactions and the overall reactivity of SiF3-x(OH)x+ (x = 0-3) toward H-2 O-18 are discussed. Occurrence of a relatively fast displacement in the tetracoordinated adducts of SiF3-x(OH)x+ (x = 1-3) with H-2 O-18 prevents their FT-ICR structural characterization.

Ionic Lewis superacids in the gas phase. Part 5. Competing ligand displacements in the adducts between SiF3-x(OH)x+ (x = 0-3) ions and H218O / Crestoni, Maria Elisa; Speranza, Maurizio. - In: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES. - ISSN 0168-1176. - STAMPA. - 130:(1994), pp. 143-149. [10.1016/0168-1176(93)03903-Y]

Ionic Lewis superacids in the gas phase. Part 5. Competing ligand displacements in the adducts between SiF3-x(OH)x+ (x = 0-3) ions and H218O.

CRESTONI, Maria Elisa;SPERANZA, Maurizio
1994

Abstract

The actual nature of the ionic intermediates involved in the gas-phase reaction of SiF3+ with water has been ascertained using a Fourier-transform ion cyclotron resonance (FT-ICR) instrument equipped with an external ion source. The complete kinetic pattern following attack of SiF3-x(OH)x+ (x = 0-3) on H-2 O-18 has been investigated, revealing the occurrence of competing H-2 O-18-to-HF and H-2 O-18-to-H-2 O-16 displacement processes, when x = 1 or 2. The factors governing the relative extent of such competing reactions and the overall reactivity of SiF3-x(OH)x+ (x = 0-3) toward H-2 O-18 are discussed. Occurrence of a relatively fast displacement in the tetracoordinated adducts of SiF3-x(OH)x+ (x = 1-3) with H-2 O-18 prevents their FT-ICR structural characterization.
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Ionic Lewis superacids in the gas phase. Part 5. Competing ligand displacements in the adducts between SiF3-x(OH)x+ (x = 0-3) ions and H218O / Crestoni, Maria Elisa; Speranza, Maurizio. - In: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES. - ISSN 0168-1176. - STAMPA. - 130:(1994), pp. 143-149. [10.1016/0168-1176(93)03903-Y]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/458408
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