Stabilizing the zwitter-ionic form of amino acids in the gas phase: An ab initio study on the minimum number of solvents and ions

- Effect of solvents and ions are studied on stability of zwitterions of amino acids.
- Second order Moller-Plesset perturbation theory is applied for the detail study.
- Water and methanol are taken as solvents.
- Two solvent molecules and a single ion are sufficient to stabilize the zwitterions.
- Electrostatic interaction is responsible for the stability.