Figure 2
(a) A projection of the structure of (I) onto the ab plane, with hydrogen bonds shown as dotted lines. (b) A projection of the structure of (I) onto the ac plane, showing the π–π interactions (dotted lines) and the centroid-to-centroid distances (in Ångström). Cg1 denotes the centroids of the pyrimidine rings and Cg2 those of the tpht2− aromatic rings. |