Proton transfer chemistry in the Gasphase
Summary: Relying on physicochemical knowledge, the proton cannot be spontaneously transferred from a gaseous mineral acid (HF, HCl, HBr, HI, HNO3, H2SO4, or HClO4) to a gaseous nitrogen base (NH3, alkylamine, aniline, pyridine, amidine, or guanidine). For example, the full proton-transfer from HCl t...
| Permalink: | http://skupnikatalog.nsk.hr/Record/nsk.NSK01000732949/Details |
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| Matična publikacija: |
Croatica chemica acta 82 (2009), 1 ; str. 87-103 |
| Glavni autor: | Raczynska, Ewa D. (-) |
| Ostali autori: | Gal, Jean-Francois (-), Maria, Pierre-Charles, Szelag, Malgorzata |
| Vrsta građe: | Članak |
| Jezik: | eng |
| Predmet: | |
| Online pristup: |
Croatica Chemica Acta |
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| 001 | NSK01000732949 | ||
| 003 | HR-ZaNSK | ||
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| 007 | ta | ||
| 008 | 100412s2009 ci ||| ||eng | ||
| 035 | |9 (HR-ZaNSK)735566 | ||
| 035 | |a (HR-ZaNSK)000732949 | ||
| 040 | |a HR-ZaNSK |b hrv |c HR-ZaNSK |e ppiak | ||
| 041 | 0 | |a eng |b hrv | |
| 042 | |a croatica | ||
| 080 | |a 54 |2 MRF 1998. | ||
| 100 | 1 | |a Raczynska, Ewa D. | |
| 245 | 1 | 0 | |a Proton transfer chemistry in the Gasphase : |b is a spontaneous 'neutralization' reaction a myth or a reality? / |c Raczynska, D. Ewa, Jean-Francois Gal, Pierre-Charles Maria and Małgorzata Szelag. |
| 300 | |b Ilustr. | ||
| 504 | |a Bibliografija: 219 jed | ||
| 504 | |a Sažetak | ||
| 520 | 8 | |a Summary: Relying on physicochemical knowledge, the proton cannot be spontaneously transferred from a gaseous mineral acid (HF, HCl, HBr, HI, HNO3, H2SO4, or HClO4) to a gaseous nitrogen base (NH3, alkylamine, aniline, pyridine, amidine, or guanidine). For example, the full proton-transfer from HCl to NH3, followed by the separation of Cl- and NH4+ requires more than 500 kJ mol-1. The same is true for a spontaneous intramolecular proton-transfer for gaseous amino acids, aminophenols and other amphiprotic compounds. From the gas-phase acidity parameter of COOH and the gas-phase basicity parameter of NH2 (or other more basic group in the side chain), it appears that proton transfer is endothermic or endergonic. For arginine, an amino acid with a highly basic guanidine function, this difference is still larger than about 300 kJ mol-1. Only solvation of the acid-base system by neutral species (e.g., one or more water molecules), complexation by ions (e.g., ionic acids or bases, metal cations) or even electrons may reduce the energetic barrier and facilitate the proton-transfer. Recent extension of the gas-phase acidity-basicity scale toward superacids and superbases, and recent development of spectroscopic techniques adapted to the gas phase for less volatile organic compounds give some perspectives for observing the full intermolecular proton-transfer between a molecular Brønsted-Lowry superacid and a molecular Brønsted-Lowry superbase | |
| 653 | 0 | |a Prijenos protona |a Plinska faza |a Kiselost |a Bazičnost |a Superkiselina | |
| 700 | 1 | |a Gal, Jean-Francois | |
| 700 | 1 | |a Maria, Pierre-Charles | |
| 700 | 1 | |a Szelag, Malgorzata | |
| 773 | 0 | |t Croatica chemica acta |x 0011-1643 |g 82 (2009), 1 ; str. 87-103 |w nsk.(HR-ZaNSK)000001621 | |
| 981 | |b B01/09 |p CRO | ||
| 998 | |a rado100412 |c vol2o130424 | ||
| 856 | 4 | 2 | |u http://hrcak.srce.hr/cca |y Croatica Chemica Acta |