Oligomeric compatibilizers for control of phase separation in conjugated polymer blend films

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Controlling the color of cholesteric liquid-crystalline films by photoirradiation of a chiroptical molecular switch used as dopant

Using thin films of a cholesteric mixture of acrylates 2 and 3 doped with the chiroptical molecular switch (M)-trans-1, photo-control of the reflection color between red and green is possible. This doped liquid-crystal (LC) film can be used for photoinduced writing, color reading, and photoinduced locking (via polymerization) of chiral, optically written information

Switching of Chirality by Light

Optically active photoresponsive molecules are described by which control of chirality is achieved by light. These chiroptical molecular switches are based on inherently dissymmetric overcrowded alkenes and the synthesis, resolution and dynamic stereochemical properties are discussed. Introduction of nitro-acceptor and dimethylamine-donor substituents in a naphto [2,1-b]thiopyran-1’-ylidene-9H-thioxanthene helical shaped alkene resulted in a highly diastereoselective modulation of photostationary states with 70%-M or 90%-P helicity, respectively. The chiroptical switches offer attractive prospects as control elements for (supra)molecular functions and organization. This is demonstrated in dual mode photoswitching of luminescence and photoswitching between liquid crystalline phases.

Synthesis of C60-attached SCS Pincer Palladium(II) Complexes

The synthesis of C60-attached SCS ligands ([C6H2(CH2SPh)2-2,6-R-4]−) is described. Starting from 4-formyl-SCS-H (2), 1,2-methanofullerene and fulleropyrrolidine SCS ligands were obtained. Subsequent palladation with [Pd(MeCN)4](BF4)2 afforded the corresponding palladium(II) complexes