Phosphorescent columnar hybrid materials containing polyionic inorganic nanoclusters.

The ternary polyionic inorganic compound Cs2Mo6Br14 and 18-crown-6 ethers bearing two o-terphenyl units have been combined to design phosphorescent columnar liquid crystalline hybrid materials. The obtained host-guest complexes are very stable even at high temperatures. Depending on their surrounding atmosphere, these hybrids switch reversibly from a high-to-low luminescence state and show a very stable emission intensity up to 140 °C.

Diastereoselective synthesis of octahydro-14H-benzo[g]quinolino-[2,3-a]quinolidines. Improved cytotoxic activity against human brain tumor cell lines as a result of the increased rigidity of the molecular backbone.

Cis-Octahydro-14H-benzo[g]quinolino[2,3-a]quinolidines 6 were obtained in 6 steps from L-phenylalanine. The key step utilizes a diastereoselective intramolecular EtAlCl2-catalyzed hetero-Diels-Alder reaction. Compounds 6a-f were tested in vitro against human medulloblastoma D283 Med and glioblastoma A-172 and T98G cell lines and showed improved cytotoxicity compared to the corresponding, less rigid pyrido[1,2-b]isoquinolines 1.