Gas phase ion processes of phosphine have been studied by theoretical calculations and experimental techniques. Ab initio quantum chemical calculations have been performed on the ion/molecule reactions starting from P+ in PH3, as they have been observed by ion trapping. P+ gives P2Hn+ (n = 1,2) product ions with loss of H2 or H in different pathways and also reacts in charge-exchange processes to form PH3+. The energies of transition structures, reaction intermediates, and final products, as well as their geometrical structures have been determined by theoretical methods. The initial step is formation of a triplet P2H3+ adduct of C3v symmetry (P–PH3+). A hydrogen atom can either be directly lost from the tetracoordinated phosphorus, or first undergo a shift to the other P atom (HP+–PH2), followed by P–H bond dissociation. Dissociation of H2 from P2H3+ can also occur from both the initial P–PH3+ and HP+–PH2 species yielding PPH+. The heats of formation of the P2Hn+ ionic species have also been computed and compared with experimental data reported in the literature.

Gas phase ion chemistry and ab initio theoretical study of phosphine. I

ANTONIOTTI, Paola;OPERTI, Lorenza;RABEZZANA, Roberto;TONACHINI, Glauco;VAGLIO, Gian Angelo
1997

Abstract

Gas phase ion processes of phosphine have been studied by theoretical calculations and experimental techniques. Ab initio quantum chemical calculations have been performed on the ion/molecule reactions starting from P+ in PH3, as they have been observed by ion trapping. P+ gives P2Hn+ (n = 1,2) product ions with loss of H2 or H in different pathways and also reacts in charge-exchange processes to form PH3+. The energies of transition structures, reaction intermediates, and final products, as well as their geometrical structures have been determined by theoretical methods. The initial step is formation of a triplet P2H3+ adduct of C3v symmetry (P–PH3+). A hydrogen atom can either be directly lost from the tetracoordinated phosphorus, or first undergo a shift to the other P atom (HP+–PH2), followed by P–H bond dissociation. Dissociation of H2 from P2H3+ can also occur from both the initial P–PH3+ and HP+–PH2 species yielding PPH+. The heats of formation of the P2Hn+ ionic species have also been computed and compared with experimental data reported in the literature.
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P. Antoniotti; L. Operti; R. Rabezzana; M. Splendore; G. Tonachini; G.A. Vaglio
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/106276
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