| Autor: |
Auberry, K. J., Byun, Y. G., Jacobson, D. B., Freiser, B. S. |
| Zdroj: |
The Journal of Physical Chemistry - Part A; November 11, 1999, Vol. 103 Issue: 45 p9029-9035, 7p |
| Abstrakt: |
The reactivity of the metallocarbohedrene cluster Ti8C12+ is studied by Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. Rate constants for the addition of various polar molecules (NH3, H2O, and CH3CN) and nonpolar molecules (C2H4 and C6H6) to Ti8C12+ are determined by isolating each Ti8C12(L)x+ (L = NH3, H2O, CH3CN, C6H6, or C2H4) species and monitoring the decay of the parent ion as a function of time. For NH3 and H2O, four fast additions are observed, with additional associations occurring at a greatly reduced rate, while reactions of Ti8C12(CH3CN)x+ (x = 0−4) with CH3CN come to a complete halt after the association of the fourth molecule of CH3CN. We propose that ligand polarity plays a key role in the dramatic decrease in rate constant observed for addition reactions which occur after the attachment of a fourth polar molecule to the cluster. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
