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- W2104080475 abstract "Abstract Ramachandran maps of neutral and ionized HCO–Gly–NH 2 and HCO–Ala–NH 2 peptide models have been built at the B3LYP/6‐31++G(d,p) level of calculation. Direct optimizations using B3LYP and the recently developed MPWB1K functional have also been carried out, as well as single‐point calculations at the CCSD(T) level of theory with the 6‐311++G(2df,2p) basis set. Results indicate that for both peptide models ionization can cause drastic changes in the shape of the PES in such a way that highly disallowed regions in neutral PES become low‐energy regions in the radical cation surface. The structures localized in such regions, $ varepsilon^{+bullet}_{rm L} $ and $ varepsilon^{+bullet}_{rm D} $ are highly stabilized due to the formation of 2‐centre‐3‐electron interactions between the two carbonyl oxygens. Inclusion of solvent effects by the conductor‐like polarizable continuum model (CPCM) shows that the solute‐solvent interaction energy plays an important role in determining the stability order. © 2008 Wiley Periodicals, Inc. J Comput Chem 2009" @default.
- W2104080475 created "2016-06-24" @default.
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- W2104080475 date "2008-12-17" @default.
- W2104080475 modified "2023-10-06" @default.
- W2104080475 title "Influence of ionization on the conformational preferences of peptide models. Ramachandran surfaces of<i>N</i>-formyl-glycine amide and<i>N</i>-formyl-alanine amide radical cations" @default.
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- W2104080475 doi "https://doi.org/10.1002/jcc.21178" @default.
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