| Autor: |
Miller, Dorothy J., Lisy, James M. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 5/14/2006, Vol. 124 Issue 18, p184301, 7p, 3 Diagrams, 2 Charts, 5 Graphs |
| Abstrakt: |
In recent years neutral indole(H2O)n clusters have been used to model the hydration of biomolecules containing an indole moiety. Both experimental and theoretical studies of the binary indole...OH2 system show NH...OH σ hydrogen-bonding. By introducing a cation to the indole...OH2 model, cation...π and ion...dipole electrostatic interactions are placed in direct competition with conventional indole...OH2 hydrogen-bonding. The effects, arising from a monovalent potassium cation on (indole)m(H2O)n clusters, were investigated using infrared photodissociation spectroscopy in the OH and NH stretching regions. In K+(indole)1(H2O)n≤=4 and K+(indole)2(H2O)m≤=3 clusters, the electrostatic ion...ligand interaction inhibits the formation of an indole NH...OH2 σ hydrogen-bond. However, indole...H2O π hydrogen-bonding via the five-membered indole ring is observed with three or more ligands around the ion. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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