Synthesis, Structural, Spectral, and Photoswitchable Properties of cis- and

摘要

As versatile synthetic intermediates for new photoswitchable molecules with a tetramethylindanylindane (stiff-stilbene) core, the cis and trans isomers of 5,16-dibromo-2,2,13',13'-tetra-methylindanylindanes 2 were synthesized by the Barton— Kellogg coupling. The bromine atoms of trans-2 could be readily replaced with alkyl (sp~3), aryl (sp~2), and ethynyl (sp) groups. The cis isomers of the parent tetramethylindanylindane 1 and its bromo derivative 2 were isolated, and their structural and photophysical properties were examined for the first time. Clean and efficient trans—cis and cis—trans photochemical isomerization processes were observed in 1.