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The effect of introduction of two <jats:italic>tert</jats:italic>‐butyl groups to the BBFPy core at the different positions on the fluorescent properties was then investigated. The <jats:italic>tert</jats:italic>‐butyl groups not only enhance the tractability with increasing solubility, but also induce different crystal‐packing patterns as anticipated. The compounds <jats:bold>2 a</jats:bold> and <jats:bold>2 b</jats:bold> show relatively strong blue fluorescence in both the solution and solid state. The 2,8‐isomer <jats:bold>2 a</jats:bold> specifically exhibits a unique mechanochromism in the solid state; <jats:bold>2 a</jats:bold> exhibits two crystalline forms, both of which show green fluorescence by grinding, while different self‐recovering fluorescence patterns between them are observed by standing. The intriguing mechanochromism is rationally interpreted in terms of molecular arrangements determined by X‐ray crystallography.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004230079964420","@type":"Researcher","foaf:name":[{"@value":"Shotaro Nakamura"}],"jpcoar:affiliationName":[{"@value":"Department of Applied Chemistry Graduate School of Engineering, Osaka University Suita  Osaka 565-0871 Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004230079964556","@type":"Researcher","foaf:name":[{"@value":"Norimitsu Tohnai"}],"jpcoar:affiliationName":[{"@value":"Department of Material and Life Science Graduate School of Engineering, Osaka University Suita  Osaka 565-0871 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