Fig. 16. (a) Topochemical synthesis of two different polymers of monomer 42 arising from polymorphs 42-I and 42-II, respectively. (b) Chemical structure of triptycene-based monomer 19. (c) Favourable crystal packing of monomer 19 in benzene solvate for the formation of a 2D polymer. (d) Crystal packing of monomer 19 in 1,2-dibromoethane solvate suitable for 1D polymer formation. (e) Chemical structure of monomer 50. (f) SCSC TAAC polymerization of the 50-I polymorph to a hydrated pseudoprotein and its reversible dehydration. (g) SCSC TAAC polymerization of polymorph 50-II. (h) Crystal packing of monomer 50 in polymorph 50-III. The anthracene, azide, alkyne and triazole units are represented by a ball-and-stick model. H atoms are omitted for clarity except N–H.