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

[INTRODUCTION]
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.
[EXPERIMENTS]
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.
[RESULTS and DISCUSSION]
First, It was revealed that the crystals showed wide spread luminescence (λ_max = 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.