Publication: The hydration structure of 18-crown-6/K<sup>+</sup>complex as studied by Monte Carlo simulation using ab initio fitted potential
Issued Date
2006-09-01
Resource Type
ISSN
10933263
Other identifier(s)
2-s2.0-33748594966
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Molecular Graphics and Modelling. Vol.25, No.1 (2006), 55-60
Suggested Citation
Sriprajak Krongsuk, Teerakiat Kerdcharoen, Supot Hannongbua The hydration structure of 18-crown-6/K<sup>+</sup>complex as studied by Monte Carlo simulation using ab initio fitted potential. Journal of Molecular Graphics and Modelling. Vol.25, No.1 (2006), 55-60. doi:10.1016/j.jmgm.2005.11.002 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/23152
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
The hydration structure of 18-crown-6/K<sup>+</sup>complex as studied by Monte Carlo simulation using ab initio fitted potential
Other Contributor(s)
Abstract
The intermolecular potential between a 18-crown-6/K+complex and a water molecule is derived from 1200 energy points obtained from quantum chemical calculations using the 6-31G** basis set. The ab initio fitted potential was then applied to study the structural properties of the complex in an aqueous solution using the Monte Carlo simulation method. The radial distribution function (RDF) centered at K+to the oxygen atom of water shows a sharp first peak at 2.88 Å. The corresponding coordination number, integrated up to the first minimum at 3.76 Å, is 2 water molecules. The results indicate clearly that the 18-crown-6/K+complex was solvated by the two nearest neighbors, one above and other below the ligand's plane. Evaluation was focused on the precise position and orientation of the two water molecules. It was found that the oxygen atoms of the two nearest neighbors bind to the K+while their hydrogen atoms rotate freely around the vector perpendicular to the ligand's molecular plane. © 2005 Elsevier Inc. All rights reserved.