1995 Volume 4 Issue 4 Pages 287-293
New cyclic conjugated oligomers were synthesized by reacting diphenyldiacetylene and phenylacetylene under high pressure below 1 GPa. The optical limiting properties of the oligomers were investigated. At low input fluence, the transmittance of the toluene solution obeyed the Beer-Lambert law. Above the threshold of the input fluence, the transmittance decreased with input fluence. The oligomers had an optical limiting property. Furthermore, a unique class of conjugated compounds composed of the derivative of condensed polycyclic aromatic compound with the phenyl group and diphenyldiacetylene oligomer was synthesized with appearance of a gas by annealing of diphenyldiacetylene under elevated pressure. The electrorheological (ER) effect of the suspension of the compound showed the high-temperature working limit to be at least 100°C
