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The lack of carbonyl groups and the presence of ether bonds give the lipid interphase a different water organization around the phosphate groups that affects the compressibility and electrical properties of lipid membranes. Generalized polarization of 14:0 Diether PC in correlation with FTIR analysis indicates a higher level of polarizability of water molecules in the membrane phase around the phosphate groups both below and above T m . This reorganization of water promotes a different response in compressibility and dipole moment of the interphase which is related to different H-bonding of water molecules with PO and CO groups.

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