Exploration of crystallisation strategies for porphyrin and phthalocyanine co-crystals Shannah Kerrigan, Neil McKeown, Euan Brechin University of Edinburgh, UK Phthalocyanines (Pcs) are macrocyclic molecules that have a broad range of applications from dyes to catalysts. One drawback of their utility is their tendency to co-facially aggregate which renders them insoluble. The introduction of bulky 2,6-diisopropylphenoxy groups inhibits this co-facial aggregation and allows for the formation of porous molecular crystals (PMCs). 1 These PMCs feature large, interconnected voids and cavities which can be functionalised by the introduction of ligands (pyridine, 4,4-bipyridine) and co-crystal components (porphyrin). 2 Recently, a new crystallisation strategy was discovered, allowing rapid crystallisation of micron-sized crystals in bulk with no loss of quality. This new technique has allowed for the expeditious exploration of new co- crystal components and applications of these PMCs. References 1. N. B. McKeown, S. Makhseed, K. J. Msayib, L.-L. Ooi, M. Helliwell, and J. E. Warren, Angew. Chem. Int. Ed., 2005, 44, 7546–7549. 2. C. G. Bezzu, M. Helliwell, J. E. Warren, D. R. Allan, and N. B. McKeown, Science, 2010, 327, 1627–1630.
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