Abstract
The short-time-scale fluctuations in 15N chemical shift tensors are examined for an ensemble of N-methylacetamide complexes constructed from a molecular dynamics (MD) trajectory of the gramicidin A channel in a fully hydrated phospholipid bilayer. Sum-over-states density functional perturbation theory (SOS-DFPT) calculations reveal fluctuations in the magnitudes and orientations of the individual tensor components on the picosecond to femtosecond time scale. The MD/SOS-DFPT technique emerges as a valuable tool for gaining insight into the nature of the terms that enter the motionally averaged spectra observed experimentally. More extensive sampling should provide first-principles predictions of the spectra under experimental conditions.
Original language | English (US) |
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Pages (from-to) | 186-194 |
Number of pages | 9 |
Journal | Chemical Physics Letters |
Volume | 239 |
Issue number | 1-3 |
DOIs | |
State | Published - Jun 9 1995 |
Externally published | Yes |
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry