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Progress in Chemistry 2009, Vol. 21 Issue (04): 600-605 Previous Articles   Next Articles

• Review •

Hydrogen Bonding Effects on Conformational Stabilities and Dissociative Photoionization Dynamics of Amino Acids

Tian Shanxi**   

  1. (Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China)
  • Received: Revised: Online: Published:
  • Contact: Tian Shanxi E-mail:sxtian@ustc.edu.cn
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Effects of types and numbers of hydrogen bonds in the isolated amino acids on both the relative stabilities of conformers and their photoionization dissociation dynamics are reviewed. The thermodynamic stabilities of the conformers are enhanced by the strong intramolecular N···H–O and C=O···H–O hydrogen bonds. Moreover, the N···H–O hydrogen bond leads to the high ionization energy of the specific conformer, and carbon dioxideis released after the intramolecular proton transfer in the ionization promotion. Cationic amino acids are distinctly different from the neutral, and some cations may be dissociated via the cleavages of carbon-carbon bonds. The remarkable stereo effects are observed in the threshold photoionization dissociation processes of serine conformers.

Contents
1 Conformers and Hydrogen Bonds of Amino Acids
2 Intramolecular Hydrogen Bonds and Conformational Stabilities
3 Photoionization and Dissociation Dynamics
4 Conclusion

Key words: amino acids, conformer stability, ionization energy, dissociation dynamics, hydrogen bonds, proton transfer, steric effect

CLC Number: 

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