Polymorphic crystals and their luminescence switching of triphenylacrylonitrile derivatives upon solvent vapour, mechanical, and thermal stimuli

2015 ◽  
Vol 3 (13) ◽  
pp. 3049-3054 ◽  
Author(s):  
Yujian Zhang ◽  
Qingbao Song ◽  
Kai Wang ◽  
Wengang Mao ◽  
Feng Cao ◽  
...  
Keyword(s):  
Organic Crystals ◽  
Yellow Fluorescence ◽  
Solvent Vapour ◽  
Polymorphic Crystals ◽  
Fluorescence Switching ◽  
Thermal Stimuli

The organic crystals BCrys, SCrys and YCrys with the blue, sky-blue, and yellow fluorescence, respectively exhibit the responsive fluorescence switching under grinding, heating and solvent vapour stimulation.

Organic polymorphs with fluorescence switching: direct evidence for mechanical and thermal modulation of excited state transitions

2019 ◽  
Vol 55 (26) ◽  
pp. 3749-3752 ◽  
Author(s):  
Shan Jiang ◽  
Jiayu Wang ◽  
Qingkai Qi ◽  
Jingyu Qian ◽  
Bin Xu ◽  
...  
Keyword(s):  
Excited State ◽  
Solid State ◽  
Direct Observation ◽  
Direct Evidence ◽  
State Transition ◽  
State Transitions ◽  
Thermal Modulation ◽  
Fluorescence Switching ◽  
Thermal Stimuli

Herein, we provide a direct observation of the modulation of the excited state transition under mechanical and thermal stimuli in the solid state by two organic polymorphs based on a tetraphenylethene derivative (APMOB).

scholarly journals Mechanical and thermal stimuli-induced release of toluene included in luminescent crystals as one-dimensional solvent channels

2020 ◽  
Vol 8 (29) ◽  
pp. 10039-10046 ◽  
Author(s):  
Yoshimitsu Sagara ◽  
Kiyonori Takahashi ◽  
Takayoshi Nakamura ◽  
Nobuyuki Tamaoki
Keyword(s):  
Organic Crystals ◽  
Mechanical Stimuli ◽  
One Dimensional ◽  
Thermal Stimuli

Thermal and mechanical stimuli-induced release of toluene from luminescent organic crystals is described.

Luminescent polymorphic crystals: mechanoresponsive and multicolor-emissive properties

CrystEngComm ◽  
2022 ◽  
Author(s):  
Suguru Ito
Keyword(s):  
Optoelectronic Devices ◽  
Organic Crystals ◽  
Security Technologies ◽  
The Past ◽  
Polymorphic Crystals ◽  
Potential Applications

Mechanoresponsive luminescent organic crystals have recently attracted increasing interest owing to their potential applications in advanced optoelectronic devices, mechanosensors, security technologies, etc. In the past few years, an increasing number...

scholarly journals Multi-color mechanochromic luminescence of three polymorphic crystals of a donor–acceptor-type benzothiadiazole derivative

CrystEngComm ◽  
2021 ◽  
Author(s):  
Suguru Ito ◽  
Sayaka Nagai ◽  
Takashi Ubukata ◽  
Takashi Tachikawa
Keyword(s):  
Color Change ◽  
Mechanical Force ◽  
Organic Crystals ◽  
The Past ◽  
Polymorphic Crystals ◽  
Donor Acceptor ◽  
Mechanochromic Luminescence

The past decade has witnessed rapid advances in the development of organic crystals that exhibit mechanochromic luminescence (MCL), i.e., the reversible color change of photoluminescence induced by mechanical force. However,...

Interpretation of irradiation-induced changes in electron diffractograms and images of extinction contours at low temperatures

1984 ◽  
Vol 42 ◽  
pp. 268-269
Author(s):  
E. Knapek ◽  
H. Formanek ◽  
G. Lefranc ◽  
I. Dietrich
Keyword(s):  
Low Temperatures ◽  
Carbon Films ◽  
Organic Crystals ◽  
Wide Spread ◽  
Lens System ◽  
Preparation Conditions ◽  
Thin Carbon ◽  
Electron Diffractograms ◽  
Diffraction Patterns ◽  
Induced Changes

A few years ago results on cryoprotection of L-valine were reported, where the values of the critical fluence De i.e, the electron exposure which decreases the intensity of the diffraction reflections by a factor e, amounted to the order of 2000 + 1000 e/nm2. In the meantime a discrepancy arose, since several groups published De values between 100 e/nm2 and 1200 e/nm2 /1 - 4/. This disagreement and particularly the wide spread of the results induced us to investigate more thoroughly the behaviour of organic crystals at very low temperatures during electron irradiation.For this purpose large L-valine crystals with homogenuous thickness were deposited on holey carbon films, thin carbon films or Au-coated holey carbon films. These specimens were cooled down to nearly liquid helium temperature in an electron microscope with a superconducting lens system and irradiated with 200 keU-electrons. The progress of radiation damage under different preparation conditions has been observed with series of electron diffraction patterns and direct images of extinction contours.

Extracellular Proteins as Enterobacterial Thermometers

2003 ◽  
Vol 86 (1-2) ◽  
pp. 139-156 ◽  
Author(s):  
Robin J. Rowbury
Keyword(s):  
Thermal Stress ◽  
Heat Shock ◽  
Stress Responses ◽  
Direct Evidence ◽  
Experimental Studies ◽  
Extracellular Proteins ◽  
Temperature Changes ◽  
Induction Components ◽  
Cellular Components ◽  
Thermal Stimuli

Biological thermometers are cellular components or structures which sense increasing temperatures, interaction of the thermometer and the thermal stress bringing about the switching-on of inducible responses, with gradually enhanced levels of response induction following gradually increasing temperatures. In enterobacteria, for studies of such thermometers, generally induction of heat shock protein (HSP) synthesis has been examined, with experimental studies aiming to establish (often indirectly) how the temperature changes which initiate HSP synthesis are sensed; numerous other processes and responses show graded induction as temperature is increased, and how the temperature changes which induce these are sensed is also of interest. Several classes of intracellular component and structure have been proposed as enterobacterial thermometers, with the ribosome and the DnaK chaperone being the most favoured, although for many of the proposed intracellular thermometers, most of the evidence for their functioning in this way is indirect. In contrast to the above, the studies reviewed here firmly establish that for four distinct stress responses, which are switched-on gradually as temperature increases, temperature changes are sensed by extracellular components (extracellular sensing components, ESCs) i.e. there is firm and direct evidence for the occurrence of extracellular thermometers. All four thermometers described here are proteins, which appear to be distinct and different from each other, and on sensing thermal stress are activated by it to four distinct extracellular induction components (EICs), which interact with receptors on the surface of organisms to induce the appropriate responses. It is predicted that many other temperature-induced processes, including the synthesis of HSPs, will be switched-on following the activation of similar extracellular thermometers by thermal stimuli.

Organic Crystals, Germanates, Semiconductors

1980 ◽  
Author(s):  
L. N. Demianets ◽  
G. A. Emelchenko ◽  
J. Hesse ◽  
N. Karl ◽  
A. N. Lobachev ◽  
...  
Keyword(s):  
Organic Crystals
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