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Crystalline Photochromism of 2-Propynylallene Derivatives Tanaka, Koichi Tomomori, Akihiro Janet, L. Scott Some 2-propynylallene derivatives exhibited color change from pale-yellow to green upon photoirradiation with visible light in the solid state. The green color disappeared either by heating or dissolving into solvents. The photochromism of 2-propynylallene derivatives depends largely on the substituents on the aromatic rings. Crystallographic analysis indicates that the overlap of the gamma systems of the fluorene moiety in the photochromic crystals allow photoinduced charge-transfer interactions in the solid-state. Chemical Society of Japan 2005-02-15 eng journal article VoR http://hdl.handle.net/10112/5551 https://kansai-u.repo.nii.ac.jp/records/11462 10.1246/bcsj.78.294 AA00580132 00092673 Bulletin of the Chemical Society of Japan 78 2 294 299 https://kansai-u.repo.nii.ac.jp/record/11462/files/KU-1100-20050215-15.pdf application/pdf 473.6 kB 2019-05-23