Document Type : Research Paper
Hydrogen bonding of DPPE with water that surrounded of membrane, plays an important role in permeability of
membrane that we were presented this matter with analysis of bond angles and torsion angles before and after of
added water molecules.
Interaction with water molecules causes some changes in the geometry of DPPE which were explained by
the contribution of zwitterionic form of DPPE molecule, also hydrated DPPE becomes stabilized. Comparison
between theoretical and experimental values of geometry of DPPE molecule calculations at HF/3-21G level
produce results in better agreement with the crystallography structure. The NMR shielding tensor of selected
atoms in the hydrated complexes of DPPE were reported by ab initio level of theory.