Novel Photochromic Molecules Based on 4,5-Dithienyl Thiazole with Fast Thermal Bleaching Rate

2007 ◽  
Vol 19 (14) ◽  
pp. 3479-3483 ◽  
Author(s):  
Shigekazu Kawai ◽  
Takuya Nakashima ◽  
Kazuhiko Atsumi ◽  
Toshiyuki Sakai ◽  
Miki Harigai ◽  
...  
Keyword(s):  
Thermal Bleaching ◽  
Photochromic Molecules ◽  
Bleaching Rate

scholarly journals Synthesis and Photochromic Properties of Conjugated Naphthopyran Derivatives

2018 ◽  
Vol 42 (9) ◽  
pp. 447-452
Author(s):  
Qian Zhao ◽  
Yanhua Yang ◽  
Kecheng Shen ◽  
Xian Tao ◽  
Yingzhong Shen
Keyword(s):  
Maximum Absorption ◽  
Side Chain ◽  
Pmma Film ◽  
Photochromic Properties ◽  
Dichloromethane Solution ◽  
Practical Applications ◽  
Thermal Bleaching ◽  
Solid Film ◽  
Maximum Absorption Wavelength ◽  
Bleaching Rate

Three novel types of naphthopyran derivatives containing alkoxyl and phenyl moieties, 13-butyl −6,11-dimethyl-3,3-diphenyl-3,13-dihydrobenzo[h]indeno[2,1-f]chromen-13-ol (NP), 13-butyl-3,3-bis(6-methoxy-[1,1′-biphenyl]-3-yl)-6,6-dimethyl-3,13-dihydrobenzo[h] indeno[2,1-f]chromen-13-ol (NP1) and 13-butyl-3,3-bis(6-methoxy-4′-naphthalenyl-[1,1′-biphenyl]-3-yl)-6,11-dimenthyl-3,13-dihydrobenz[h]indeno[2,1-f]chromen-13-ol (NP2), were synthesised and characterised. Measurements indicated that they possessed an excellent photochromic response, a rapid thermal bleaching rate and good fatigue resistance. Meanwhile, the UV maximum absorption wavelengths of NP1 (562 nm) and NP2 (597 nm) appeared bathochromically shifted compared with NP (536 nm). The bleaching rate of NP1 was found to be approximately twice that of NP. The results indicated that the UV maximum absorption wavelength and bleaching rate increase with increasing length of the phenyl side chain moieties. In PMMA film, the compounds showed almost the same photochromic properties in the solid state as in dichloromethane solution. The UV absorbance with high-contrast switching in solid film could be beneficial for practical applications.

Construction of pillar[5]arene-based photochromic supramolecular polymeric system with tunable thermal bleaching rate

Polymer ◽  
2021 ◽  
Vol 231 ◽  
pp. 124112
Author(s):  
Qiuxia Wu ◽  
Tianze Zhang ◽  
Xiaoyan Li ◽  
Xi Tu ◽  
Huangcheng Zhang ◽  
...  
Keyword(s):  
Polymeric System ◽  
Thermal Bleaching ◽  
Bleaching Rate

Effect of photodegradation on the thermal bleaching rate constant of photochromic compounds in spiro[indoline-pyran] and spiro[indoline-oxazine] series

1995 ◽  
Vol 91 (3) ◽  
pp. 223-232 ◽  
Author(s):  
Christiane Salemi-Delvaux ◽  
Barbara Luccioni-Houze ◽  
Gilles Baillet ◽  
Gérard Giusti ◽  
Robert Guglielmetti
Keyword(s):  
Rate Constant ◽  
Photochromic Compounds ◽  
Thermal Bleaching ◽  
Bleaching Rate

Solid-state Reversible Optical Switch Based on Two Dendritic Molecules with dual sensitivity of mechanochromism and photochromism

2021 ◽  
Author(s):  
Yuhui Yang ◽  
Zhe He ◽  
Junzhao He ◽  
Yuqing Li ◽  
Yilong Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Polymer Matrix ◽  
Optical Switch ◽  
New Method ◽  
Photochromic Molecules ◽  
Conformational Freedom

Efficient isomerization of photochromic molecules requires conformational freedom and is often limited to the solution or polymer matrix. Thus, developing a new method to improve photochromism in the solid state...

Light-Triggered Switching of Quantum Dot Photoluminescence through Excited-State Electron Transfer to Surface-Bound Photochromic Molecules

Nano Letters ◽  
2021 ◽  
Author(s):  
Suyog Padgaonkar ◽  
Christopher T. Eckdahl ◽  
Jakub K. Sowa ◽  
Rafael López-Arteaga ◽  
Dana E. Westmoreland ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Quantum Dot ◽  
State Electron ◽  
Photochromic Molecules

scholarly journals Ocean acidification has no effect on thermal bleaching in the coral Seriatopora caliendrum

Coral Reefs ◽  
2013 ◽  
Vol 33 (1) ◽  
pp. 119-130 ◽  
Author(s):  
C. B. Wall ◽  
T.-Y. Fan ◽  
P. J. Edmunds
Keyword(s):  
Ocean Acidification ◽  
Thermal Bleaching

scholarly journals Photoregulation of Small G Protein Kras using Photochromic Molecules

2014 ◽  
Vol 106 (2) ◽  
pp. 614a
Author(s):  
Seigo Iwata ◽  
Shinsaku Maruta
Keyword(s):  
G Protein ◽  
Small G Protein ◽  
Photochromic Molecules

scholarly journals Photocontrolled wettability changes in polymer microchannels doped with photochromic molecules

2007 ◽  
Vol 91 (11) ◽  
pp. 113113 ◽  
Author(s):  
Lucia Caprioli ◽  
Elisa Mele ◽  
Francesco Elio Angilè ◽  
Salvatore Girardo ◽  
Athanassia Athanassiou ◽  
...  
Keyword(s):  
Photochromic Molecules

Primary products and processes in the γ-radiolysis of 2-methyltetrahydrofuran

1965 ◽  
Vol 285 (1402) ◽  
pp. 319-338 ◽  
Keyword(s):  
Glassy Phase ◽  
Kcal Mole ◽  
Radical Species ◽  
Molecule Reaction ◽  
Positive Ions ◽  
Primary Products ◽  
Diffusion Controlled ◽  
Thermal Bleaching ◽  
The Matrix ◽  
Kinetics Of

From a study of the u. v., visible, near i. r. and e. s. r. spectra induced by γ -irradiation at 77°K in glassy MTHF and in glassy MTHF containing various additives and from a study of controlled temperature increases on these spectra, the following conclusions are drawn. (1) The primary products of the radiolysis are electrons ( e - ) and positive ions ( MTHF + ) which undergo a rapid ion-molecule reaction to give O CH 3 radicals ( R ⋅). (2) e - can either be trapped in the glassy MTHF matrix or can be captured by either napththalene, ferric chloride, carbon tetrachloride, nitrous oxide or trans -stilbene if these substances are present. (3) The e - T are bleachable by light or heat and disappear independently of the radicals R⋅ without either augmentation of R⋅ or the production of any new radical species. (4) e - T and R⋅ disappear thermally and independently by second-order reactions, the rate constants being K e - + e - (M -1 S -1 ) = 10 12⋅4±1⋅1 exp ─ [0⋅85 ± 0⋅10 kcal/mole/ R ( T ─ 75)] and K R˙ + R˙ (M -1 S -1 ) = 10 13⋅3±1⋅4 exp ─ [1⋅20 ± 0⋅15 kcal/mole/ R ( T ─ 75)]. These rate expressions suggest that both reactions are diffusion controlled at low temperatures in the glassy phase. (5) The kinetics of the thermal bleaching of e - T indicate that the electrons migrate distances of about 150 Å from their parent positive ions before being trapped in the matrix. (6) The effect of FeCl 3 in reducing the formation of e - T at 77°K and its lack of effect on the thermal bleaching of e - T suggests that the reaction e - + FeCl 3 → FeCl 2 + Cl - only occurs before the electron is thermalized.

Heat-Evolved Microalgal Symbionts Increase Thermal Bleaching Tolerance of Coral Juveniles Without a Trade-Off Against Growth

2021 ◽  
Author(s):  
Kate Quigley ◽  
Carlos Alvarez Roa ◽  
Jean-Baptiste Raina ◽  
Mathieu Pernice ◽  
Madeleine van Oppen
Keyword(s):  
Trade Off ◽  
Thermal Bleaching
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