New octupolar star-shaped strucures for quadratic nonlinear optics

Two new classes of octupolar nonlinear chromophores, deriving from 1,3,5-tr iazines and oligothienylic crystal violet analogues, have been synthesized and their nonlinear properties investigated using the harmonic light scatte ring experiment. The easy preparation of these molecules makes them attract ive candidates for further applications. Off-resonant measurements show hig h nonlinearities together with an excellent transparency, which make these compounds of promising interest for the emerging schemes of nonlinear optic al applications whereby the multipolar character of the chromophores is of particular importance.