Novel two-dimensional octupoles containing azo groups and their oligomers have been synthesized and their first hyperpolarizabilities were determined. The λmax and β(0) values of azo octupoles are nearly the same regardless of the nature of the bridge or the conjugation length. On the other hand, 1,3,5-tricyano-2,4,6-tris-[4-(p-diethylaminostyryl)styryl]benzene has a larger β(0) value than the corresponding azo analogue probably due to the more efficient conjugation ability of C=C compared with the N=N bond. The β(0)/MW of the octupoles are larger than the corresponding dipoles, whereas those of the azo octupoles are comparable to the latter. Also, retention of monomeric β(0) is observed in the octupolar oligomers.
ASJC Scopus subject areas
- Materials Chemistry