On-Off Type Mechanofluorochromism of a Novel Fluorescent Amorphous Molecular Material, N-{4-[Bis(4-methylphenyl)amino]benzylidene}aniline

Reversible Change in Fluorescent Color of Moisture‐sensitive Binary Films of 4‐[Bis(4‐methylphenyl)amino]benzylideneaniline with Organic Acids

“…Vacuum‐deposited films of emitting amorphous molecular materials were applicable to organic emitting diodes [2] . We have prepared several stimuli‐responsible emitting amorphous molecular materials such as solvatochromic, vapochromic, and mechanocromic emitters [3,4] . In addition to these single films, amorphous molecular materials can be form homogeneous and/or phase‐separated films with other materials.…”

Mechanofluorochromism of 1‐Alkanoylaminopyrenes

“…During the course of our studies on the creation of amorphous molecular materials,2 we recently reported that 4‐[bis(4‐methylphenyl)amino]benzaldehyde and its analogues exhibit mechanofluorochromism, owing to the formation of their amorphous states by grinding the crystalline samples 3. In addition, we have demonstrated that N ‐{4‐[bis(4‐methylphenyl)amino]benzylidene}aniline exhibits on–off mechanofluorochromism 4. We concluded that these materials exhibit a new type of mechanofluorochromism and that emitting materials with the ability both to undergo a large conformational change in their excited state and to achieve glass formation by grinding the crystal become candidates for new mechanofluorochromic materials 3.…”

“…We concluded that these materials exhibit a new type of mechanofluorochromism and that emitting materials with the ability both to undergo a large conformational change in their excited state and to achieve glass formation by grinding the crystal become candidates for new mechanofluorochromic materials 3. 4…”

Emitting Behaviors of 1-Acetylaminopyrene Dispersed in Poly(vinyl acetate) Film

“…A variety of mechanochromic fluorescent materials have been reported and the phenomena were generally believed to be due to change in intermolecular interactions caused by altering their molecular arrangements in the crystalline state induced by mechanical stress. We have been reported two series of mechanochromic fluorescent materials, i.e., amorphous molecular materials based on diarylaminobenzaldehyde [7][8][9][10] and 1alkanoylaminopyrenes [11][12]. With regard to the latter system, fluorescent color of recrystallized sample of 1-alkanoylaminopyrens, including 1acetylaminopyrene (AAPy), changed bluish purple to yellowish green by grinding due to formation of crystal defects which allowed to form excimer [11].…”