부산대학교 도서관

A series of 1,3,5‐tricyano‐2,4,6‐tris(styryl)benzene derivatives (1,2) and dendrimers (3) have been synthesized and their first hyperpolarizabilities (β) were determined. Whereas the λmaxvalues of 1–3are similar, the oscillator strength increases with the molecular size. For all compounds, the Stokes shifts are significantly larger when NAr2is used as the donor. The β(0) values of 1–3range from 252 to 507 × 10–30esu and increases with the number of octupolar units in the molecule. When the octupolar molecules are linked to the 1,3,5‐position of the benzene ring by flexible ether linkages, the β(0) value increases by 1.7 fold. On the other hand, octupolar monodendron based on the nitrogen atom core and 1,3,5‐tricyano‐2,4,6‐tris(p‐diarylaminostyryl)benzene moieties at the periphery exhibits β(0) = 507 × 10–30esu, which is one of the largest β(0) values reported for the octupolar molecules.