@article{oai:ynu.repo.nii.ac.jp:00009313,
 author = {Okada, Naoya and Eto, Ryohei and Babamoto-Horiguchi, Emi and Kobayashi, Takashi and Naito, Hiroyoshi and Shiro, Motoo and Takahashi, Hiromi and Matsumoto, Shinya},
 issue = {5},
 journal = {Bulletin of the Chemical Society of Japan},
 month = {},
 note = {Optical properties of three crystal modifications of 5-t-butyl-2,3-dicyano-6-[4-(dimethylamino)styryl]pyrazine having different color appearances were measured and interpreted on the basis of crystal structure analysis. Two of the three modifications exhibited a bathochromic spectral shift both in absorption and fluorescence compared with those in a toluene solution of the dye. The crystal structure analysis revealed that a two-dimensional brick-wall structure is formed in both modifications. In contrast, the third modification showed a hypsochromic absorption shift with a large bathochromic fluorescence shift. The crystal structure of this modification was characterized by a one-dimensional stacked molecular column. The optical characteristics of the three modifications were qualitatively interpreted in terms of excitonic intermolecular interaction on the basis of their crystal structures.},
 pages = {716--721},
 title = {Optical Properties of Three Differently Colored Crystal Modifications of a 2,3-Dicyanopyrazine Dye},
 volume = {88},
 year = {2015}
}