Helical self-assembly and nonlinear optical properties of two optically active phthalocyanine derivatives with the same chiral substituents on the alpha or beta position

摘要

An optically active phthalocyanine derivative with eight (S)-2-methylbutoxy moieties linked on alpha-position is originally synthesized. Through electronic absorption, circular dichroism (CD), fluorescence spectra, scanning electron microscopy (SEM) and X-ray diffraction (XRD) technique, its helical self-assembly and nonlinear optical properties are comparatively investigated with its analogous which has the same chiral moieties linked on beta-position substitutions. Although these two complexes possess the same chiral functional group, they exhibit different CD signals in the Q absorption region of corresponding complex and self-assemble into different morphologies. One self-assembles into right-handed ribbon-like aggregates while the other one is left-handed fibers. In addition, both complexes show good third-order nonlinear optical property. (C) 2015 Elsevier B.V. All rights reserved.