Gas phase ion–molecule reactions of dimethylsulphoxide

1978 ◽  
Vol 56 (17) ◽  
pp. 2324-2330 ◽  
Author(s):  
John Edward Fulford ◽  
Joseph Wayne Dupuis ◽  
Raymond Evans March
Keyword(s):  
Gas Phase ◽  
Ambient Pressure ◽  
Reaction Chamber ◽  
Ion Trapping ◽  
Ion Chemistry ◽  
Gas Phase Ion Chemistry ◽  
Molecule Reaction ◽  
Ion Molecule Reactions ◽  
Ion Storage ◽  
Gas Phase Ion

The gas phase ion-chemistry of dimethylsulphoxide (DMSO) and deuterated dimethylsulphoxide (DMSO-d6) has been examined using a quadrupole ion store (QUISTOR) as an ion–molecule reaction chamber. The QUISTOR results are compared with those obtained by ion trapping and high pressure mass spectrometry as reported by other workers. The performance of the QUISTOR demonstrates the versatility of the technique for ion–molecule reaction studies with variation of ambient pressure and duration of ion storage.

A Potential Surface Map of the H-/N2O System. The Gas Phase Ion Chemistry of HN2O-

1995 ◽  
Vol 48 (2) ◽  
pp. 155 ◽  
Author(s):  
JC Sheldon ◽  
RAJ Ohair ◽  
KM Downard ◽  
S Gronert ◽  
M Krempp ◽  
...  
Keyword(s):  
Gas Phase ◽  
Potential Surface ◽  
Excess Energy ◽  
Phase Reaction ◽  
Ion Chemistry ◽  
Gas Phase Ion Chemistry ◽  
Molecule Reaction ◽  
Deep Channel ◽  
Direct Formation ◽  
Gas Phase Ion

Dunkin, Fehsenfeld and Ferguson have reported that the gas phase reaction between H- and N2O in a flowing afterglow instrument forms HO- and N2 with medium efficiency. The potential surface (UMP2-FC/6-311++G**//RHF/6-311++G**) for the H-/N2O system confirms this to be the predominant reaction following initial approach of H- towards the central nitrogen of N2O to form unstable intermediate [H-(N2O)]. The intermediate then decomposes to HO- and N2 via a deep channel. The potential surface also shows the direct formation of adducts -O-+N(H)=N- and cis HN=NO-. However, these are formed with excess energy: the former converts principally into reactants, while the latter decomposes to HO- and N2. Ions having the formula 'HN2O-' may be formed in the gas phase by the reactions ( i ) HNO-+N2O → HN2O-+NO, and (ii) NH2-+Me3CCH2ONO → HN2O-+Me3CCH2OH. The product anion is stabilized by removal of some of its excess energy by the eliminated neutral. Evidence is presented which indicates that the product is either cis or trans HN=NO-, or a mixture of both. The characteristic ion molecule reaction of HN=NO- involves oxidative oxygen transfer to suitable neutral substrates. For example: HN2O-+CS2 → HS-+N2+COS.

Gas-phase ion chemistry of Ti(O-i-Pr)4

2005 ◽  
Vol 83 (11) ◽  
pp. 1913-1920 ◽  
Author(s):  
Luciano A Xavier ◽  
José M Riveros
Keyword(s):  
Gas Phase ◽  
Nucleophilic Addition ◽  
Negative Ion ◽  
Elimination Reaction ◽  
Ion Chemistry ◽  
Gas Phase Ion Chemistry ◽  
Ion Molecule Reactions ◽  
Negative Ion Mode ◽  
Gas Phase Ion ◽  
Low Pressures

The positive and negative gas-phase ion chemistry of Ti(O-i-Pr)4 was investigated at low pressures by FT-ICR. The fragment ion, (i-PrO)3Ti-O+=C(H)Me, reacts with the parent neutral by proton transfer and by a nucleophilic addition–elimination reaction. The nature of the fragment ion and the ensuing ion–molecule reactions clearly indicate that Ti(O-i-Pr)4 exists as a monomer in the gas phase. In the negative ion mode, F– was found to react easily with Ti(O-i-Pr)4 to yield the pentacoordinated complex FTi(O-i-Pr)4– ion. This hypervalent Ti species undergoes a series of sequential fragmentations induced by IR multiphoton excitation. The first step is unusual because two channels are observed by IRMPD: one involves loss of HF, and the other loss of i-PrOH. The subsequent dissociation processes are characterized by progressive elimination of propene giving rise to a number of different titanaoxirane-containing anions with the general formula [(η2-CMe2O)Ti(OH)3–n(i-PrO)n]–. FTi(O-i-Pr)4– was also observed to undergo multiple alkoxide–fluoride exchanges with BF3 leading to the eventual formation of TiF5–.Key words: titanium tetraisoproxide, gas-phase ion chemistry, hypervalent Ti, ion–molecule reactions, IRMPD.

ChemInform Abstract: Recent Gas Phase Ion Chemistry Studies

ChemInform ◽  
2010 ◽  
Vol 30 (20) ◽  
pp. no-no
Author(s):  
Nico M. M. Nibbering
Keyword(s):  
Gas Phase ◽  
Ion Chemistry ◽  
Gas Phase Ion Chemistry ◽  
Gas Phase Ion

Gas-Phase Ion Chemistry of Small Gold Cluster Anions

2010 ◽  
Vol 29 (13) ◽  
pp. 3001-3006 ◽  
Author(s):  
Robert F. Höckendorf ◽  
Yali Cao ◽  
Martin K. Beyer
Keyword(s):  
Gas Phase ◽  
Gold Cluster ◽  
Cluster Anions ◽  
Ion Chemistry ◽  
Gas Phase Ion Chemistry ◽  
Gas Phase Ion ◽  
Small Gold Cluster

Gas-phase ion chemistry of the propyne/ammonia and silane/propyne/ammonia systems

2004 ◽  
Vol 232 (2) ◽  
pp. 139-146 ◽  
Author(s):  
L. Operti ◽  
R. Rabezzana ◽  
F. Turco ◽  
G.A. Vaglio
Keyword(s):  
Gas Phase ◽  
Ion Chemistry ◽  
Gas Phase Ion Chemistry ◽  
Gas Phase Ion
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