Distyrylbenzene moiety

Moreover, chromophores 77 and 78 can be considered as twin chromo-phores that are connected through cr-bonds. While 77 represents a triplebond chromophore, 78 incorporates a distyrylbenzene moiety. In particular, the strong alignment of the 7i-chromophores through the cyclophane structure results in an increase of both OP and TP properties. 

Fourfold Heck coupling (twofold on each dibromobenzene moiety) and Jeffery conditions has been applied on the two easily accessible tetrabromo[2.2]paracyclophane isomers 21 and 23, respectively, to prepare new double-layered 1,2- and 1,4-distyrylbenzene chromophoric systems 22-R and 24-R respectively, to enable studies of intramolecular charge-transfer phenomena in such systems (Scheme... 

The combined extension of the chromophore and introduction of the alkoxysilane using silyl-styrene 15 is also possible with bifunctional bromides dibromobenzene 23 (n = 0) gave the distyrylbenzene with 2 silane moieties in 16% yield, and the transformation of distyrylbenzene 24 (n = 1) to the 5-ring OPV yielded 33% of 26 (n = 2) after chromatographic separation from 14% of the intermediate with both a bromine and an alkoxysilane. 

Distyrylbenzenes with the general structure 58 have become one of the most widely used compounds for applications in TP photosciences. The TPA of these chromophores is higher compared to that of donor substituted polyenes 57. Thus, the (phenylene-vinylene) moiety is presumably a better re-bridge to increase 8 compared to the diphenylpolyene in 57. Increase of the re-bridge in 58 has an impact on Moi and M12, respectively, resulting in an increase of 8 because for such chromophores 8 is proportional to (Moi M12)2, Eq. (27). Furthermore, substitution of stilbene and distyrylbenzene by amino groups at the chromophore ends results in a three- to fourfold increase of M12 while... 

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