The protonation of peptides: A non-empirical theoretical study
✍ Scribed by J.B. Moffat
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 589 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0022-5193
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📜 SIMILAR VOLUMES
The ground state spins of an interesting class of non-Kekuld molecules are predicted to be different from that obtained using simple Hilckel molecular orbital theory and Hund's rule. These predictions based on a general rule proposed recently are verified using semi-empirical AM 1 /CI calculations.
Ž . w Ž .Ž .Ž .x shifts GIAO-B3LYPrI are reported for selected VO OH OH glyglyЈ 2 w Ž .Ž .x Ž isomers, deprotonated forms thereof, and VO OH glyglyЈ glyglyЈ s . Ž 51 . H N-CH -CO-N-CH -COO . The ␦ V values are quite sensitive to 2 2 2 structural details in the first and second coordination spheres
Ab initio calculations on double proton transfer in six-membered rings indicate that as the polarity of the system increases the symmetric H-bonded structure is stabilized with respect to the asymmetric one. Strong donor-acceptor systems are candidates for the formation of cyclic vapour-phase ion pa