Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 117, Issue 5, Pages 1357-1366Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp3094534
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Funding
- Office of Naval Research [N00014-10-1-0600]
- Defense Threat Reduction Agency [HDTRA1-10-1-0074]
- National Science Foundation [CBET-0854298]
- National Science Foundation through TeraGrid [TG-CHE110006]
- University of Washington eScience Institute
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Zwitterionic carboxybetaines (CBs) are ubiquitous in nature and considered promising materials for biological and chemical applications. A thorough understanding of the effect of carbon spacer length (CSL) on molecular properties is important. In this work, using molecular dynamics simulation and quantum chemical calculation, we investigated the effect of CSL on the molecular properties of CB molecules. The hydration number, structure, and dynamics of carboxylic and trimethyl ammonium groups were investigated and found to present different behaviors in regards to the variation of CSL. The simulation results with partial charges developed from quantum chemical calculations were compared with those with partial charges from the OPLS all atom (OPLSAA) force field. The hydration free energy of CB molecules and CB-Na+ association was also studied as a function of CSL.
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