Journal
SOFT MATTER
Volume 18, Issue 10, Pages 2006-2011Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sm01585k
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Funding
- project NCN Maestro [2016/22/A/ST5/00319]
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A new type of 3D columnar phase with a large unit cell and Fddd lattice is reported, resulting from the arrangement of helical columns of opposite chiralities into a triangular lattice. The fluorescence properties of the studied materials can be easily tuned by modifying the molecular structure.
Mesogenic materials, quinoxaline derivatives with semi-flexible cores, are reported to form a new type of 3D columnar phase with a large crystallographic unit cell and Fddd lattice below the columnar hexagonal phase. The 3D columnar structure is a result of frustration imposed by the arrangement of helical columns of opposite chiralities into a triangular lattice. The studied materials exhibit fluorescence properties that could be easily tuned by modification of the molecular structure; for compounds with the extended pi electron conjugated systems the fluorescence is quenched. For molecules with a flexible structure the fluorescence quantum yield reaches 25%. On the other hand, compounds with a more rigid mesogenic core, for which the fluorescence is suppressed, show effective photogeneration of charge carriers. For some materials bi-polar hole and electron transport was observed.
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