Journal
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
Volume 108, Issue 6, Pages 1181-1188Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/qua.21569
Keywords
aspartic acid; zwitterionic species; acid dissociation constant; DFT; CPCM; IEFPCM; solvent effect
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Determination of acid-dissociation constants, pK(a), of aspartic acid in aqueous solution, using density functional theory calculations combined with the conductor-like polarizable continuum model (CPCM) and with integral-equation-formalism polarizable continuum model (IEFPCM) based on the UAKS and UAHF radii, was carried out. The computed pKa values derived from the CPCM and IEFPCM with UAKS cavity model of bare structures of the B3LYP/6-31+G(d,p)-optimized tetrahydrated structures of aspartic acid species are mostly close to the experimental pKa values. (C) 2007 Wiley Periodicals, Inc.
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