Molecular Self-Assemblies in Co-Crystals: Engineering Chemical Reactivity and Organic Semiconductors - Molecular Self-Assembly: Advances and Applications - page 234

approach to organic semiconductors of increasing complexity and
determine the charge mobilities of the resulting solids.

(a)

(b)

Figure 7.5 X-ray structures of (a) 2(5-iodoresorcinol)·2(9,10-

bis(4-pyridylethynyl)anthracene) and (b) 2(5-
methylresorcinol)·2(2,5-bis(4-pyridylethynyl)thiophene).

7.6 Summary and Outlook

Inthischapter,wehaveshownthatfiniteassembliesofmoleculescan
be developed in the organic solid state to direct chemical reactivity
and achieve stacking of organic semiconductor molecules. The
assemblies are achieved using a co-crystal approach [6] wherein res,
and derivatives, is employed to assemble molecular substrates via
hydrogenbonds[4,5].Thegeometriesoftheassembliesefectively
decouplepackingpropertiesofthesubstratesfromtheefects
of long-range packing so that the solid state may be employed to
construct complex targets and enforce face-to-face arrangements
of the semiconductor molecules. In addition to expanding the co-
crystal method, we are focusing on how more complex assembly
processes [3], which can encompass networks and higher order
co-crystals (e.g., ternary solids), can be developed to confront the
problems associated with supramolecular synthesis as related to the
crystal engineering of bulk properties.