Figure 7
Crystal packing diagrams for compound 1, showing the distinct layering of independent molecules A (green), B (blue) and C (red), as viewed in (a) along the a axis and in (b) along the b axis; the propargylic group in the `tail' moiety of each molecule is circled in its respective colour to highlight the orthogonal directionality of the C (red) compared with the A (green) and B (blue) groups. Void spaces observed in the space-filling models are illustrated in cartoon form by dark-grey shapes with relative sizes drawn approximately to scale. |