期刊
CHEMICAL PHYSICS
卷 349, 期 1-3, 页码 69-76出版社
ELSEVIER
DOI: 10.1016/j.chemphys.2008.02.063
关键词
humic substances; acrylic acid; adsorption; calcium bridge; herbicides; (4-chloro-2-methylphenoxy) acetic acid; MCPA; density functional theory
Hydrogen bonded and cation bridged comlexation of poly(acrylic acid) oligomers, representing a model compound for humic acids, with acetic acid and the herbicide (4-chloro-2-methylphenoxy) acetic acid (MCPA) have been studied by means of density functional theory. Solvation effects were computed by means of a combination of microsolvation (explicit insertion of water molecules) and global solvation (polarizable continuum approach). The stability of hydrogen bonded complexes in solution is characterized by a strong competition between solute and solvent molecules. The cation bridged complexes of the negatively charged (deprotonated) ligands were found to be strongly favored explaining the capability of humic acids to fixate anionic species from soil solutions and the ability to form cross-linking structures within the humic acid macromolecules. (c) 2008 Elsevier B.V. All rights reserved.
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