title: Incremental solvation of nonionized and zwitterionic glycine.
abstract: Microsolvation and combined microsolvation-continuum approaches are employed in order to examine the structures and relative energies of nonionized (N) and zwitterionic (Z) glycine clusters. Bridging structures are predicted to be the global minima after 3-5 discrete water molecules are included in the calculations. Calculations incorporating electron correlation stabilize the zwitterionic structures by about 7-9 kcal/mol relative to the N structures regardless of the number of discrete water molecules considered. Continuum calculations stabilize the Z structures relative to N structures; this effect decreases as the number of discrete water molecules is increased. Eight water molecules do not appear to fully solvate glycine.
authors.affiliation: Department of Chemistry, Iowa State University, Ames, IA 50011, USA.
authors.forename: Christine M
authors.initials: CM
authors.lastname: Aikens
authors.forename: Mark S
authors.initials: MS
authors.lastname: Gordon
mesh_terms: D005998:Glycine / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008958:Models, Molecular; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D007477:Ions; D014867:Water; D005998:Glycine