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Density functional computations of proton affinity and gas-phase basicity of proline

✍ Scribed by T. Marino; N. Russo; E. Tocci; M. Toscano

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 211 KB
Volume: 36
Category: Article
ISSN: 1076-5174
DOI: 10.1002/jms.134

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✦ Synopsis

Abstract

An Erratum has been published for this article in Journal of Mass Spectrometry 37(2) 2002, 232.

The proton affinity and gas‐phase basicity of proline were evaluated by using density functional theory coupling the B3‐LYP hybrid functional with the extended 6–311++G** basis set. Cis and trans conformations of the carboxyl moiety for both exo and endo ring structures were considered for the neutral proline. The results show that the most stable structure of proline has the endo ring conformation with the carboxyl group in the cis position. The structure at the global minimum is stabilized by an intramolecular hydrogen bond. The nitrogen of the ring in the exo form is the preferred protonation site. The calculated proton affinity (924.3 kJ mol^−1^) and gas‐phase basicity (894.4 kJ mol^−1^) are in very good agreement with the experimental counterparts. Copyright © 2001 John Wiley & Sons, Ltd.

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