Mechanochromic Luminescence Quenching: Force-Enhanced Singlet-to-Triplet Intersystem Crossing for Iodide-Substituted Difluoroboron−Dibenzoylmethane−Dodecane in the Solid State

2010 ◽  
Vol 49 (23) ◽  
pp. 10747-10749 ◽  
Author(s):  
Guoqing Zhang ◽  
Jiwei Lu ◽  
Cassandra L. Fraser
Keyword(s):  
Solid State ◽  
Luminescence Quenching ◽  
Intersystem Crossing ◽  
Mechanochromic Luminescence

Luminescence Quenching of Rhodamines by Cyclooctatetraene

1987 ◽  
Vol 42 (9) ◽  
pp. 1009-1013 ◽  
Author(s):  
P. Targowski ◽  
B. Ziętek ◽  
A. Bączyński
Keyword(s):  
Rhodamine B ◽  
Rate Constants ◽  
Internal Conversion ◽  
Rhodamine 6G ◽  
Second Order ◽  
Luminescence Quenching ◽  
Intersystem Crossing ◽  
Order Rate ◽  
Quenching Process

Cyclooctatetraene (COT) as a quencher of fluorescence of a series of Rhodamine solutions was studied. The second order rate constants for the quenching process of Rhodamine 110, Rhodamine 19 pchl., Rhodamine 6G pchl., Rhodamine 6G, Tetramethylrhodamine, Rhodamine B and Rhodamine 3B pchl. are given. It was found that COT enhances rather intersystem crossing than internal conversion.

scholarly journals Sequential halochromic/mechanochromic luminescence of pyridyl-substituted solid-state emissive dyes: thermally controlled stepwise recovery of the original emission color

CrystEngComm ◽  
2019 ◽  
Vol 21 (38) ◽  
pp. 5699-5706 ◽  
Author(s):  
Suguru Ito ◽  
Chika Nishimoto ◽  
Sayaka Nagai
Keyword(s):  
Solid State ◽  
Emission Color ◽  
In Series ◽  
Temperature Controlled ◽  
Mechanochromic Luminescence

A stepwise temperature-controlled emission-color switch has been achieved in a system that combines halochromic and mechanochromic luminescence in series.

scholarly journals Structure–mechanical property correlations in mechanochromic luminescent crystals of boron difluoride dibenzoylmethane derivatives

IUCrJ ◽  
2015 ◽  
Vol 2 (6) ◽  
pp. 611-619 ◽  
Author(s):  
Gamidi Rama Krishna ◽  
Ramesh Devarapalli ◽  
Rajesh Prusty ◽  
Tiandong Liu ◽  
Cassandra L. Fraser ◽  
...  
Keyword(s):  
Solid State ◽  
Mechanical Behaviour ◽  
Crystal Engineering ◽  
Mechanical Analysis ◽  
Slip Systems ◽  
Crystalline Materials ◽  
Organic Solid ◽  
Boron Difluoride ◽  
Deformation Tests ◽  
Mechanochromic Luminescence

The structure and mechanical properties of crystalline materials of three boron difluoride dibenzoylmethane (BF2dbm) derivatives were investigated to examine the correlation, if any, among mechanochromic luminescence (ML) behaviour, solid-state structure, and the mechanical behaviour of single crystals. Qualitative mechanical deformation tests show that the crystals of BF2dbm(tBu)2can be bent permanently, whereas those of BF2dbm(OMe)2exhibit an inhomogeneous shearing mode of deformation, and finally BF2dbmOMe crystals are brittle. Quantitative mechanical analysis by nanoindentation on the major facets of the crystals shows that BF2dbm(tBu)2is soft and compliant with low values of elastic modulus,E, and hardness,H, confirming its superior suceptibility for plastic deformation, which is attributed to the presence of a multitude of slip systems in the crystal structure. In contrast, both BF2dbm(OMe)2and BF2dbmOMe are considerably stiffer and harder with comparableEandH, which are rationalized through analysis of the structural attributes such as the intermolecular interactions, slip systems and their relative orientation with respect to the indentation direction. As expected from the qualitative mechanical behaviour, prominent ML was observed in BF2dbm(tBu)2, whereas BF2dbm(OMe)2exhibits only a moderate ML and BF2dbmOMe shows no detectable ML, all examined under identical conditions. These results confirm that the extent of ML in crystalline organic solid-state fluorophore materials can be correlated positively with the extent of plasticity (low recovery). In turn, they offer opportunities to design new and improved efficient ML materials using crystal engineering principles.

Solvothermal self-assembly of Cd2+ coordination polymers with supramolecular networks involving N-donor ligands and aromatic dicarboxylates: synthesis, crystal structure and photoluminescence studies

2017 ◽  
Vol 46 (11) ◽  
pp. 3623-3630 ◽  
Author(s):  
Yadagiri Rachuri ◽  
Bhavesh Parmar ◽  
Kamal Kumar Bisht ◽  
Eringathodi Suresh
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Coordination Polymers ◽  
Self Assembly ◽  
Luminescence Quenching ◽  
Donor Ligands ◽  
Supramolecular Networks ◽  
Photoluminescence Studies ◽  
State Luminescence

Structural, solid state luminescence of Cd(ii) coordination polymers and detection of acetone by CP1via luminescence quenching have been discussed.

Aggregation-induced emission and reversible mechanochromic luminescence of carbazole-based triphenylacrylonitrile derivatives

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32697-32704 ◽  
Author(s):  
Yong Zhan ◽  
Peng Gong ◽  
Peng Yang ◽  
Zhe Jin ◽  
Ying Bao ◽  
...  
Keyword(s):  
Solid State ◽  
Organic Molecules ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Aggregation Induced Emission ◽  
Π Interactions ◽  
Conjugated Organic Molecules ◽  
Mechanochromic Luminescence

Conjugated organic molecules exhibiting AIE are characterized by the strongly twisted conjugated skeleton, which could provide loose intermolecular stacking and weak π–π interactions in the solid state to generate stimuli-responsive materials.

Design for multi-step mechanochromic luminescence property by enhancement of environmental sensitivity in a solid-state emissive boron complex

2020 ◽  
Vol 4 (6) ◽  
pp. 1781-1788 ◽  
Author(s):  
Satoru Saotome ◽  
Kazumasa Suenaga ◽  
Kazuo Tanaka ◽  
Yoshiki Chujo
Keyword(s):  
Solid State ◽  
Luminescence Property ◽  
Design Concept ◽  
Environmental Sensitivity ◽  
Crystalline Sample ◽  
Boron Complex ◽  
Mechanochromic Luminescence

The solid-state emissive boron complex with multi-step mechanochromic luminescence was designed. The crystalline sample showed gradual changes in luminescent color triggered by scratching. The design concept is illustrated.

scholarly journals Ultralong room-temperature phosphorescence of a solid-state supramolecule between phenylmethylpyridinium and cucurbit[6]uril

2019 ◽  
Vol 10 (33) ◽  
pp. 7773-7778 ◽  
Author(s):  
Zhi-Yuan Zhang ◽  
Yu Liu
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Data Encryption ◽  
Intersystem Crossing ◽  
Nonradiative Relaxation ◽  
Room Temperature Phosphorescence

We report an ultralong room-temperature phosphorescence (2.62 s) based on cucurbit[6]uril host and phenyl-methyl-pyridinium guest for data encryption. Encapsulation of CB[6] boosts intersystem crossing and suppresses nonradiative relaxation of guest.

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