scholarly journals Modulating Room-Temperature Phosphorescence-To-Phosphorescence Mechanochromism by Halogen Exchange

2022 ◽  
Vol 9 ◽  
Author(s):  
Yoshika Takewaki ◽  
Takuji Ogawa ◽  
Yosuke Tani

Modulating the stimulus-responsiveness of a luminescent crystal is challenging owing to the complex interdependent nature of its controlling factors, such as molecular structure, molecular conformation, crystal packing, optical properties, and amorphization behavior. Herein, we demonstrate a halogen-exchange approach that disentangles this problem, thereby realizing the modulation of room-temperature phosphorescence-to-phosphorescence mechanochromism. Replacing the bromine atoms in a brominated thienyl diketone with chlorine atoms afforded isostructural crystals; i.e., molecules with different halogen atoms exhibited the same molecular conformation and crystal packing. Consequently, amorphization behavior toward mechanical stimulation was also the same, and the phosphorescence of amorphous states originated from the same conformer of each diketone. In contrast, the phosphorescence properties of each conformer were modulated differently, which is ascribable to heavy atom effects, resulting in the modulation of the mechanochromism. Thus, halogen exchange is a promising approach for modulating the stimulus-responsive photofunctions of crystals involving spin-forbidden processes.

2019 ◽  
Vol 7 (2) ◽  
pp. 230-236 ◽  
Author(s):  
Xianggui Kong ◽  
Xinrui Wang ◽  
Huimin Cheng ◽  
Yufei Zhao ◽  
Wenying Shi

We present a design principle to activate highly efficient organic room temperature phosphorescent (ORTP) of carbon dots (CDs), with layered double hydroxides (LDHs) as the host matrix, that utilizes three synergistic effects,i.e.structural confinement effect, heavy atom effect, and chemical bonding.


1981 ◽  
Vol 53 (3) ◽  
pp. 437-444 ◽  
Author(s):  
L. J. Cline. Love ◽  
J. G. Habarta ◽  
Marie. Skrilec

1995 ◽  
Vol 49 (3) ◽  
pp. 320-323 ◽  
Author(s):  
Wei Jun Jin ◽  
Hai Rong Zhang ◽  
Xin Yang ◽  
Chang Song Liu

Cadmium acetate salts can greatly enhance room-temperature phosphorescence (RTP) of purine and 6-mercaptopurine. 6-Mercapto-substituent and 6-hydroxy-substituent appear quite different in their effect on the RTP of purine. The effects of cadium salt matrix and pH on the RTP of purine compounds were also investigated in detail. With cadmium acetate as a source of heavy atom perturbation, nanogram or subnanogram amounts of purines can be detected.


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