以非手性喹喔啉衍生物为半柔性核的复合手性柱
Complex chiral columns made of achiral quinoxaline derivatives with semi-flexible cores
摘要：
具有半柔性核的喹喔啉衍生物介晶材料被报道可以在柱状六方相下形成具有大晶胞和Fddd对称性的新型三维柱状结构。三维柱状结构是由相反手性的螺旋柱排列成三角形晶格所施加的挫折的结果。所研究的材料具有荧光性质，可以很容易地通过改变分子结构来调节，具有扩展的π电子共轭系统的化合物形成聚集体，荧光被猝灭。对于具有柔性结构的分子，荧光量子产率达到25%。另一方面，具有更刚性的介晶核的化合物，其荧光被抑制，显示出强的空穴光电流。对于一些材料，还观察到双极性：空穴和电子转移。
英文摘要：
Mesogenic materials, quinoxaline derivatives with semi-flexible cores, are reported to form new type of 3D columnar structure with large crystallographic unit cell and Fddd symmetry below columnar hexagonal phase. The 3D columnar structure is a result of frustration imposed by arrangement of helical columns of opposite chirality into triangular lattice. The studied materials exhibit fluorescent properties that could be easily tuned by modification of molecular structure, compounds with the extended π electron conjugated systems form aggregates and fluorescence is quenched. For molecules with flexible structure the fluorescence quantum yield reaches 25%. On the other hand, compounds with more rigid mesogenic core, for which fluorescence is suppressed show strong hole photocurrent. For some materials also bi-polar: hole and electron transfer was observed.
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