Investigating Properties and Trends of Cocrystals Composed of Pyrogallol[4]arenes and Anthracene-Based Fluorescent Probes

Cocrystals composed of various pyrogallol[4]­arenes
of different
tail lengths with anthracene-based probes in a series of solvent systems
are analyzed and compared with the aim to determine the effects of
solvent, tail length, and functionality of the probe. The five main
characteristics that are influenced are the bowl shape of the pyrogallol[4]­arene,
complexation of the probe molecule, the C–H···π
interactions, the overall hydrogen bonding scheme, and the final ratio
of probe to pyrogallol[4]­arene. With modifications to the probe
molecules, the characteristics most influenced are the bowl shape
of the pyrogallol[4]­arene, the C–H···π
interactions, and the hydrogen bond schemes. Alterations in aliphatic
tail length affect the complexation of the probe along with the C–H···π
interactions and hydrogen bonding scheme. Solvent has an effect on
the complexation of the probe, the final ratio of probe to pyrogallol[4]­arene,
the bowl shape of the pyrogallol[4]­arene, and the hydrogen bonding
schemes. Emerging trends due to these modifications are examined and
discussed.