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7637920 
Journal Article 
Trimethylsilyl Group Assisted Stimuli Response: Self-Assembly of 1,3,6,8-Tetrakis((trimethysilyl)ethynyl)pyrene 
Xu, F; Ohta, K; Orita, A; Otera, J; Nishida, T; Shinohara, K; Peng, L; Takezaki, M; Kamada, T; Akashi, H; Nakamura, H; Sugiyama, K; , 
2017 
1 
Organometallics
ISSN: 0276-7333
EISSN: 1520-6041 
AMER CHEMICAL SOC 
WASHINGTON 
36 
3 
556-563 
English 
WOS:000394198100008 
Substitution of 1,3,6,8-tetraethynylpyrene with sterically bulky trimethylsilyl groups enabled four modes of molecular packing, two polymorphs (triclinic system (Y-form) and "loose" crystal Coll,. (O-K-form)), a "rigid" liquid crystalline phase Coll,. (O-C-form), and an amorphous phase (O-A-form), which emitted fluorescence at different wavelengths under UV light. The four phases could be interconverted by physical stimuli such as heating, grinding by mortar and pestle, and exposing to the vapor of organic solvents.