http://www.cnr.it/ontology/cnr/individuo/prodotto/ID55007
Solvation of tetraalkylammonium chlorides in acetonitrile-water mixtures: Mass spectrometry and molecular dynamics simulations (Articolo in rivista)
- Type
- Label
- Solvation of tetraalkylammonium chlorides in acetonitrile-water mixtures: Mass spectrometry and molecular dynamics simulations (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1002/cphc.200500050 (literal)
- Alternative label
Saielli, G., Scorrano, G., Bagno, A., Wakisaka, A. (2005)
Solvation of tetraalkylammonium chlorides in acetonitrile-water mixtures: Mass spectrometry and molecular dynamics simulations
in ChemPhysChem (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Saielli, G., Scorrano, G., Bagno, A., Wakisaka, A. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Dipartimento di Scienze Chimiche, Universit di Padova
via Marzolo, 1 35131, Padova (Italy)
National Institute of Advanced Industrial Science and
Technology (AIST), Onogawa 16-1, Ibaraki 305-8569, Tsukuba (Japan)
Istituto per la Tecnologia delle Membrane del CNR
Sezione di Padova, via Marzolo, 1 I35131, Padova (Italy) (literal)
- Titolo
- Solvation of tetraalkylammonium chlorides in acetonitrile-water mixtures: Mass spectrometry and molecular dynamics simulations (literal)
- Abstract
- The solvation of tetramethylammonium chloride (Me4NCl) and
tetra-n-butylammonium chloride (Bu4NCl) in water-acetonitrile
mixtures was investigated by mass spectrometry of clusters isolated
from the solution. As far as the positive ions are concerned,
clusters composed of alkylammonium ions and acetonitrile molecules
only were observed, even for mixtures with high water content.
In contrast, for the negative ions, clusters composed of chloride
with both water and/or acetonitrile molecules were observed.
For the smaller system (Me4NCl) we performed quantum chemical
calculations and molecular dynamics simulations. It was found
that even though water is present in the solvation shell of Me4N+
, only acetonitrile has a strong electrostatic interaction with the
cation. Water molecules around Me4N+ form hydrogen bonds
with other water molecules, and they interact with Me4N+
mainly via dispersive interactions. These results indicate that
Me4N+ behaves like a hydrophobic solute. On the other hand,
the interaction of Cl? with water and acetonitrile is of comparable
strength and, in both cases, the electrostatic interaction dominates.
Herein we demonstrate experimentally and theoretically
that positive and negative ions give rise to characteristic solvation
structures in mixed solvents: even a relatively small organic
cation, such as Me4N+, exhibits a hydrophobic-like solvation
shell. (literal)
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