The BODIPY appended complex 20 crystallized with one molecule in the asymmetric unit. The respective dihedral angles between the dipyrrin plane (of the ALDIPY unit) and the phenyl substituent were 69-70°. The separation between the aluminum and boron atoms was 16. 35-16.50 Å. The crystal structure showed the formation of a framework structure with very large cavities (Fig. ). Similar to 16 this represents a promising route towards nanomaterials, e.g., via using PSs as drug delivery platforms, enhancing the biocompatibility or finding use in different fields. Figure . View of the molecular structure in the crystal of 20. Hydrogen atoms and disordered positions have been omitted.