Ph. D. THESIS 2009
Ph. D. THESIS 2009
Ph. D. THESIS 2009
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Figure 32. ORTEP diagram for the cyclic trimer of achiral 5-syn isomer.<br />
The distances from the hydrogen atoms of OH groups to the N atoms<br />
are d = 1.842-1.974 Å in the dimer and d’ = 1.676 – 1.848 Å in the trimer,<br />
respectively. These low values suggest strong interactions by hydrogen bonds<br />
and a high stability of the cyclic structures.<br />
The investigations of the lattice for 2-syn revealed a layered structure<br />
with transversal (along the crystallographic axis a) and longitudinal (along the<br />
crystallographic axis b) channels (Figure 33).<br />
Figure 33. View of the lattice (along the c crystallographic axis) of 5-syn.<br />
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