The effect of geometric factors on the assembly of luminescent cocrystals between pyrene or phenanthrene and trihaloperfluorobenzenes.

We report N,O-Boron-chelated dipyrromethenes derivatives manifesting circularly polarized luminescence (CPL) in red/near-infrared region both in solution and aggregation state. The CPL is originated from the helical chirality through intramolecular substitution...

Organic light-emitting materials play an essential role in the field of luminescent materials because they are easily prepared and they have controllable luminescent properties. Here it is shown that intermolecular interactions and luminescent properties of cocrystals can be predicted using the molecular surface electrostatic potential of selected -hole/-holeÁ Á Á bonding donor haloperfluorobenzenes and acceptor acenaphthene (AC). Single-crystal X-ray diffraction data reveal that actual bonding patterns in five cocrystals assembled from haloperfluorobenzenes and AC are in accordance with predictable patterns of intermolecular interactions; that is -holeÁ Á Á bond is the major interaction in AC-octafluoronaphthalene, AC-1,4-dibromotetrafluorobenzene and AC-1,3,5-tribromo-2,4,6-trifluorobenzene cocrystals, whereas -holeÁ Á Á bond is the major interaction in AC-1,4-diiodotetrafluorobenzene and AC-1,3,5-trifluoro-2,4,6-triiodobenzene cocrystals. The luminescent properties of the cocrystals are affected by the bonding patterns between AC and haloperfluorobenzenes; the -holeÁ Á Á bond leads to weak phosphorescence, whereas the -holeÁ Á Á bond results in weak delayed fluorescence and relatively strong phosphorescence. research papers Acta Cryst. (2018). B74, 610-617 Lili Li et al. Cocrystals with tunable luminescence colour 611 research papers Acta Cryst. (2018). B74, 610-617 Lili Li et al. Cocrystals with tunable luminescence colour 617

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Maternal serum and placental CRH expression in ICP patients were up-regulated after treatment of UDCA. The up-regulation of CRH expression after UDCA treatment may play an important role in the therapeutic mechanism of ICP. All patients recruited in this study had severe cholestasis (TBA ≥ 40 µmol/L). Further studies are warranted in different gestational weeks and TBA levels to provide more evidence for the correlation between UDCA treatment and CRH expression in ICP patients.