A Tunable Solid-State Luminescence System Consisting of 4,4’’-Terphenyldisulfonic Acid and 1,2,4,5-Tetracyanobenzene with Aliphatic Amines

Department of Material and Life Science, Graduate School of Engineeing, Osaka University
○Keisuke Inoue Norimitsu Tohnai Ichiro Hisaki Mikiji Miyata

Solid-state organic luminescence has been the focus of considerable interest because of their various availabilities in the applied fields. In this work, we prepared CT complex crystals composed of 4,4''-terphenyldisulfonic acid (TPDS), various aliphatic amines, and 1,2,4,5-tetracyanobenzene (TCNB) (Figure shown at the bottom), here we elucidated the correlation between the photophysical properties and crystal structures.
CT complex crystals were prepared by mixing TPDS, the amines and TCNB in methanol/acetnitrile with a 1:2:1 molar ratio. We investigated the crystals by fluorescence spectroscopy and single crystal X-ray structure analysis.
First, It was revealed that the crystals showed wide spread luminescence (λmax = 475-563 nm) corresponding to difference of the amines (Figure shown at the bottom). Next, the crystal structures were classified into 4 groups by single crystal X-ray structure analysis. Consequently we found the luminescence of CT complex crystals depended on relative alignments between TPDS and TCNB, which are is controlled by the amines.