Proton order dimer orientations

Two water molecules connected by hydrogen bond in hexagonal ice can have four possible configurations. These configurations are distinguished by the relative orientations of the two molecules and termed for obvious reasons as c-cis, h-cis, c-trans, and h-trans. (See Figure 2) Occurrence of symmetry permitted dimer orientations is a characteristic feature of each ice polymorph. In the proton-ordered structures the occurrence of orientations is... 

Our idea is once more described as follows. First, a hydrophobic environment to retard the proton-driven oxidation [Eq. (4)] is constructed around porphinatoiron in aqueous media by embedding porphinatoiron in a phospholipid bilayer. Secondly, the porphinatoiron is molecularly dispersed in the phospholipid bilayer and the porphyrin plane of the porphinatoiron is oriented parallel to the bilayer, which prevents the oxidation via a p-dioxo dimer [Eq. (3)] (see Fig. 4). We further synthesized novel, sterically modified and amphiphilic porphinatoiron derivatives, in order to improve the compatibility of the porphinatoiron with the phospholipid bilayer of the liposome. 

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