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).

Direct Observation of Excited State Conversion in Solid State from a TICT-Type Mechanochromic Luminogen

2021 ◽  
pp. 118179
Author(s):  
Jianai Chen ◽  
Sijie Tan ◽  
Yue Yu ◽  
Shitong Zhang ◽  
Weijun Li ◽  
...  
Keyword(s):  
Excited State ◽  
Solid State ◽  
Direct Observation

Visualization and Manipulation of Molecular Motion in Solid State through Photo-Induced Clusteroluminescence

2019 ◽  
Author(s):  
Haoke Zhang ◽  
Lili Du ◽  
Lin Wang ◽  
Junkai Liu ◽  
Qing Wan ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Excited State ◽  
Solid State ◽  
Light Source ◽  
Molecular Motion ◽  
Molecular Machine ◽  
Conjugated Molecules ◽  
Time Resolved ◽  
Packing Structure ◽  
New Strategy

<p>Building molecular machine has long been a dream of scientists as it is expected to revolutionize many aspects of technology and medicine. Implementing the solid-state molecular motion is the prerequisite for a practical molecular machine. However, few works on solid-state molecular motion have been reported and it is almost impossible to “see” the motion even if it happens. Here the light-driven molecular motion in solid state is discovered in two non-conjugated molecules <i>s</i>-DPE and <i>s</i>-DPE-TM, resulting in the formation of excited-state though-space complex (ESTSC). Meanwhile, the newly formed ESTSC generates an abnormal visible emission which is termed as clusteroluminescence. Notably, the original packing structure can recover from ESTSC when the light source is removed. These processes have been confirmed by time-resolved spectroscopy and quantum mechanics calculation. This work provides a new strategy to manipulate and “see” solid-state molecular motion and gains new insights into the mechanistic picture of clusteroluminescence.<br></p>

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.

scholarly journals The development of aryl-substituted 2-phenylimidazo[1,2-a]pyridines (PIP) with various colors of excited-state intramolecular proton transfer (ESIPT) luminescence in the solid state

2016 ◽  
Vol 4 (16) ◽  
pp. 3599-3606 ◽  
Author(s):  
Toshiki Mutai ◽  
Tatsuya Ohkawa ◽  
Hideaki Shono ◽  
Koji Araki
Keyword(s):  
Excited State ◽  
Solid State ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Aryl Group ◽  
Red Emission ◽  
Wide Range

The color of ESIPT luminescence of HPIP is tuned in a wide range by the introduction of aryl group(s), and thus a series of PIPs showing blue to red emission is realized.

In-line monitoring of solid-state transitions during fluidisation

2007 ◽  
Vol 62 (1-2) ◽  
pp. 408-415 ◽  
Author(s):  
Jaakko Aaltonen ◽  
Karin Kogermann ◽  
Clare J. Strachan ◽  
Jukka Rantanen
Keyword(s):  
Solid State ◽  
State Transitions

Solid-State Transition of Poly(butylene terephthalate) Induced by Mechanical Deformation

1980 ◽  
Vol 13 (1) ◽  
pp. 137-145 ◽  
Author(s):  
Kohji Tashiro ◽  
Yuzo Nakai ◽  
Masamichi Kobayashi ◽  
Hiroyuki Tadokoro
Keyword(s):  
Solid State ◽  
State Transition ◽  
Mechanical Deformation ◽  
Butylene Terephthalate ◽  
Solid State Transition

Structural diversity of new solid-state luminophores based on quinoxaline-β-ketoiminate boron difluoride complexes with remarkable fluorescence switching properties

2015 ◽  
Vol 51 (13) ◽  
pp. 2656-2659 ◽  
Author(s):  
Chia-Wei Liao ◽  
Rajeswara Rao M. ◽  
Shih-Sheng Sun
Keyword(s):  
Solid State ◽  
Structural Diversity ◽  
Acid Base ◽  
Fluorescence Switching ◽  
Solid State Fluorescence ◽  
Boron Difluoride

Highly tunable organoboron luminophores with intense solid-state fluorescence showed outstanding photoswitching properties modulated by acid/base vapors.

Substitution Effect on 2-(Oxazolinyl)-phenols: Emission Color-Tunable, Minimalistic Excited-State Intramolecular Proton Transfer (ESIPT)-based Luminophores

2021 ◽  
Author(s):  
Dominik Göbel ◽  
Pascal Rusch ◽  
Daniel Duvinage ◽  
Tim Stauch ◽  
Nadja C. Bigall ◽  
...  
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Solid State ◽  
Substitution Effect ◽  
Optical Characterization ◽  
Intramolecular Proton Transfer ◽  
Substitution Pattern ◽  
Emission Color ◽  
Color Tunable

The synthesis and optical characterization of novel single-benzene ESIPT-based fluorophores is described in solid state and in solution. Special attention is given towards the influence of their unique substitution pattern on their optical properties. Depending on this pattern, aggregation induced emission or aggregation caused quenching (ACQ) is observed in the solid state.<br>

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