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This study synthesized a series of methoxystilbazolium analogues with -conjugation extended by attaching a fused aromatic ring, i.e., 6-styrylisoquinolinium and 4-[2-(2-naphthyl)ethenyl]pyridinium derivatives with methoxy substituents. We evaluated their transition energies (E eg s) and second-order hyperpolarizabilities (s) experimentally using their absorption spectra and a hyper-Rayleigh scattering measurement, respectively. Subsequently, we calculated s using the MOPAC PM3 method. Thesedoi:10.1246/bcsj.78.180 fatcat:3twp2b4ut5ecli3k2y54bcvdry