A comparison of the relative binding energies of H+ and NO+ to aromatic and haloaromatic bases by high pressure mass spectrometry

1982 ◽  
Vol 60 (18) ◽  
pp. 2402-2402
Author(s):  
John A. Stone ◽  
Dena E. Splinter ◽  
Soon Yau Kong
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Binding Energies ◽  
Relative Binding

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A comparison of the relative binding energies of H+ and NO+ to aromatic and haloaromatic bases by high pressure mass spectrometry

1982 ◽  
Vol 60 (7) ◽  
pp. 910-915 ◽  
Author(s):  
John A. Stone ◽  
Dena E. Splinter ◽  
Soon Yau Kong
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Proton Affinity ◽  
Marked Effect ◽  
Ion Source ◽  
Binding Energies ◽  
Absolute Value ◽  
Pulsed Electron Beam ◽  
Relative Binding ◽  
Benzene Toluene

Proton transfer equilibria [Formula: see text] and NO+ transfer equilibria [Formula: see text] have been studied for the following bases B, benzene, toluene, o-, m-, and p-xylene. NO+ transfer equilibria for fluoro- and chlorobenzene have also been studied. Pulsed electron beam, high-pressure ion source mass spectrometry has been used to obtain the equilibrium constant K and hence the free energy changes ΔG0 and from van't Hoff plots, ΔH0 and ΔS0. Entropy changes are in general much smaller for NO+ transfer than for H+ transfer but the magnitude of the changes in the proton affinity and NO+ affinity of toluene caused by a fluorine substituent is about the same, even though the absolute value of the proton affinity is greater by a factor of 4. The position of the F substituent on toluene has a marked effect on proton affinity but no effect on NO+ affinity. The latter appears to be responsive only to the inductive effect.

The binding energies of trialkylgermanium cations to water molecules studied by high pressure mass spectrometry

1987 ◽  
Vol 65 (9) ◽  
pp. 2146-2148 ◽  
Author(s):  
John Alfred Stone ◽  
Wilhelmus Johannes Wytenburg
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Electron Beam ◽  
Binding Energy ◽  
Thermodynamic Data ◽  
Binding Energies ◽  
Water Molecules ◽  
Pulsed Electron Beam

The binding energies of H2O to R3Ge+ have been measured using pulsed electron beam, high pressure mass spectrometry. van't Hoff plots have yielded thermodynamic data (ΔH0, ΔS0) for the reactions, [5], [Formula: see text]and [7], [Formula: see text]. [Formula: see text] decreases with increasing size of R (CH3 28.6 ± 0.5 kcal mol−1, C4H9 20.6 ± 1.2 kcal mol−1) while [Formula: see text] shows much less change (34.4 ± 0.9 to 30.3 ± 2.8 cal K−1 mol−1). Comparison with data for (CH3)3M+ (M = Si, Sn) shows that binding energy decreases with increasing size of M.

scholarly journals Ethoxylated Butoxyethanol-BADGE Adducts—New Potential Migrants from Epoxy Resin Can Coating Material

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3682
Author(s):  
Monika Beszterda ◽  
Małgorzata Kasperkowiak ◽  
Magdalena Frańska ◽  
Sandra Jęziołowska ◽  
Rafał Frański
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Liquid Chromatography ◽  
Epoxy Resin ◽  
Diglycidyl Ether ◽  
Ionization Mass ◽  
Coating Materials ◽  
Oxyethylene Unit ◽  
Bisphenol A Diglycidyl Ether ◽  
Product Ions

The acetonitrile extracts of can-coating materials have been analyzed by using high-pressure liquid chromatography/electrospray ionization-mass spectrometry (HPLC/ESI-MS). On the basis of detected ions [M + H]+, [M + NH4]+, [M + Na]+ and product ions, the ethoxylated butoxyethanol-bisphenol A diglycidyl ether adducts were identified in two of the analyzed extracts. Although the oxyethylene unit-containing compounds are widely used for the production of different kinds of materials, the ethoxylated species have not been earlier detected in epoxy resin can-coatings.

scholarly journals Fast log P determination by ultra-high-pressure liquid chromatography coupled with UV and mass spectrometry detections

2009 ◽  
Vol 394 (7) ◽  
pp. 1919-1930 ◽  
Author(s):  
Yveline Henchoz ◽  
Davy Guillarme ◽  
Sophie Martel ◽  
Serge Rudaz ◽  
Jean-Luc Veuthey ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Liquid Chromatography ◽  
High Pressure Liquid Chromatography ◽  
Log P ◽  
Ultra High Pressure
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