Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 110, Issue 13, Pages 6444-6446Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp0600817
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- PHS HHS [S06M008047] Funding Source: Medline
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The covalent nature of interactions within various hydrogen bonded molecular aggregates has been characterized by the two entirely different computational methods: Bader analysis of the electron density and variation-perturbation partitioning of the intermolecular interaction energy. Analysis of 34 complexes representing different types of hydrogen bonds indicates that the proton-acceptor distance similar to 1.8 angstrom and the ratio of delocalization and electrostatic terms similar to 0.45 constitutes approximately a borderline between covalent and noncovalent hydrogen bonds. The latter ratio could be used to characterize quantitatively the degree of the covalent nature of transition state interactions with active site residues, a quantity essential for an enzyme catalytic activity.
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