Relevant bibliographies by topics / Gated photochromism

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Gated photochromism'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Gated photochromism"

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Baggi, Giorgio, Lorenzo Casimiro, Massimo Baroncini, Serena Silvi, Alberto Credi, and Stephen J. Loeb. "Threading-gated photochromism in [2]pseudorotaxanes." Chemical Science 10, no. 19 (2019): 5104–13. http://dx.doi.org/10.1039/c9sc00913b.

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Photochromic axles bearing a bis(thienyl)ethene moiety exhibit threading-gated photochromism, where formation of a [2]pseudorotaxane with crown ether rings significantly enhances the photochromic properties of the axles.
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Wang, Leyu, Tao Yu, Zongliang Xie, Eethamukkala Ubba, Tianya Zhan, Zhiyong Yang, Yi Zhang, and Zhenguo Chi. "Gated photochromic molecules with AIEgen: turn-on the photochromism with an oxidation reagent." RSC Advances 8, no. 33 (2018): 18613–18. http://dx.doi.org/10.1039/c8ra02828a.

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Bouas-Laurent, Henri, and Heinz Dürr. "Organic photochromism (IUPAC Technical Report)." Pure and Applied Chemistry 73, no. 4 (January 1, 2001): 639–65. http://dx.doi.org/10.1351/pac200173040639.

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This technical report is a general introduction to organic photochromism. The definition of photochromism (PC) is given together with that of words with the ending "chromism", such as thermo-, electro-, piezo-, and tribochromism. Important concepts such as two-photon, gated, dual-mode PC and chirochromism are illustrated. The concept of fatigue (chemical degradation) and the determination of the main photochromic parameters (number of cycles, cyclability, half-life), and the spectrokinetic and mechanistic aspects are discussed. The main families of PC (organic compounds and biological receptors) are illustrated with chemical formulae, and the different types of reactions involved in the photochromic processes (pericyclic reactions, E/Z isomerization, group transfer, etc.) are listed. Some examples of applications to "optical power limiting" substances, photoresponsive materials, and photoswitchable biomaterials are considered.
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Kühni, Joël, and Peter Belser. "Gated Photochromism of 1,2-Diarylethenes." Organic Letters 9, no. 10 (May 2007): 1915–18. http://dx.doi.org/10.1021/ol070487h.

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Kang, Jijoon, and Youngmin You. "Nondestructive readout fluorescence memory based on a gallium(III) corrole complex and photochromic cis-1,2-dithienylethene." Journal of Porphyrins and Phthalocyanines 19, no. 01-03 (January 2015): 281–87. http://dx.doi.org/10.1142/s1088424615500017.

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Photochromic switching of fluorescence emission provides a viable principle to creation of all optical molecular memory. Successful operation of the fluorescence memory requires deliberate control of the energetics between a fluorophore and a photochrome. One essential requirement is that photoexcitation for fluorescence emission does not interfere with the photochromic processes. Gallium(III) corrole complexes outfit the condition because their fluorescence emissions display large Stokes shifts, permitting photoexcitation at the optical window where the photochromism of cis-1,2-dithienylethene is not executed. To demonstrate the capability for fluorescence memory, we prepared molecularly dispersed poly(methyl methacrylate) (PMMA) films of a gallium corrole complex and cis-1,2-dithienylethene. The memory cycle comprising fluorescence readout and reversible photochromic switching of the fluorescence emission is fully reversible without suffering from fatigue during repeated operation. The corresponding fluorescence on/off ratio is greater than those of previous memory based on porphyrins. Fluorescence lifetime measurements employing time-correlated single photon counting techniques reveal occurrence of fast energy transfer (~ 109 s-1) which is effectively gated by the photochromism.
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Li, Yuezheng, Xuanying Chen, Taoyu Weng, Jufang Yang, Chunrui Zhao, Bin Wu, Man Zhang, Liangliang Zhu, and Qi Zou. "A monomolecular platform with varying gated photochromism." RSC Advances 10, no. 69 (2020): 42194–99. http://dx.doi.org/10.1039/d0ra08214g.

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A strategy to realize varying degrees of gated photochromic properties by coordinating with different metal ions within one unimolecular system was devised to achieve the construction of a logic circuit for multi-functional molecular switching.
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Chen, ZiHui, ShengMin Zhao, ZhongYu Li, Zhi Zhang, and FuShi Zhang. "Acid/alkali gated photochromism of two diarylperfluorocyclopentenes." Science in China Series B: Chemistry 50, no. 5 (October 2007): 581–86. http://dx.doi.org/10.1007/s11426-007-0114-9.

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Mao, Yueyuan, Keyin Liu, Guanglei Lv, Ying Wen, Xingjun Zhu, Haichuang Lan, and Tao Yi. "CB[8] gated photochromism of a diarylethene derivative containing thiazole orange groups." Chemical Communications 51, no. 30 (2015): 6667–70. http://dx.doi.org/10.1039/c5cc01390a.

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Wolf, Jannic, Thomas Huhn, and Ulrich E. Steiner. "Large protonation-gated photochromism of an OPE-embedded difurylperfluorocyclopentene." Physical Chemistry Chemical Physics 17, no. 8 (2015): 6066–75. http://dx.doi.org/10.1039/c4cp05258g.

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Xiong, Kang-Tai, Meng-Lian Li, Yue Jiang, Hai-Bing Xu, and Ming-Hua Zeng. "Imidazole diarylethene switches: an alternative to acid-gated photochromism." New Journal of Chemistry 44, no. 19 (2020): 8061–67. http://dx.doi.org/10.1039/d0nj00606h.

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Dissertations / Theses on the topic "Gated photochromism"

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Massaad, Julie. "Photo-modulations vs gated photochromism in a dithienylethene dye." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1863/.

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"L'objectif de cette thèse est l'étude de la photo-modulation et du " gated photochromism " d'un diacide dithienyléthène ayant une structure minimale très simple, dans différents milieux. Ces deux comportements proviennent de la combinaison de l'isomérisation photochimique et d'une réaction chimique associée impliquant un ou les deux photo-isomères. Tout d'abord, l'étude de la photo-modulation et du " gated photochromism " du diacide a été réalisée en présence de différentes quantités d'une base, l'hydroxyde de tétrabutylammonium, dans un mélange acétonitrile / eau. La méthode de modélisation dynamique a été utilisée pour établir les principaux paramètres photochromiques (rendements quantiques), spectroscopiques (coefficients d'extinction molaire) et thermodynamiques (constantes d'équilibres) du diacide. Malgré sa structure très simple, les résultats montrent que peut être exploitable comme un photo-générateur d'acide. Les comportements des photo-isomères de diacide ont également été étudiés en présence de cuivre (II). Dans ce système, le cuivre (II) est utilisé comme un réactif oxydant pour promouvoir la réaction d'ouverture thermique de l'isomère cyclisé du diacide dithienylethene. La présence de petites quantités de base () ou d'acide dans le milieu peut altérer la réaction d'ouverture de cycle provoquant l'inhibition ou l'accélération de la réaction d'ouverture, respectivement. Finalement, l'utilisation du diacide comme un photo-modulateur de luminescence a été étudiée en présence des nanoparticules de ZnO fluorescents qui sont stabilisées par des ligands d'hexadécylamine (HDA). De façon inattendue, les deux photoisomères du diacide ont réduit l'émission des nanoparticules de ZnO, l'isomére cyclisé était le plus efficace des deux. L'extinction de l'intensité de l'émission par le transfert des électrons et des processus de transfert d'énergie ont été suggérés comme mécanismes. Bien que la photodégradation se produise, la possibilité d'activer et de désactiver la luminescence de ZnO a été réalisée. "
The aim of this thesis is the study of photo-modulations and gated photochromism behaviors of a mini-sized diacid dithienylethene derivative DTE(COOH)2 in different guest systems. These two behaviors originate from the coupling between the photochemical isomerization and various associated chemical process involving one or both of the photo-isomers. First, the study of the acidity photo-modulation and gated photochromism of DTE(COOH)2 was carried out in presence of various amount of a base, tetrabutylammonium hydroxide, in acetonitrile/water mixtures. Chemical dynamic modelling methodology was used to establish the main photochromic (quantum yields), spectral (molar extinction coefficients) and thermodynamic (equilibria constants) parameters of the base sensitive diacid. Despite its very simple structure, results show that DTE(COOH)2 can be exploitable for a reversible photo-acid generation. Behaviors of photoisomers of diacid DTE(COOH)2 were also studied in presence of copper (II). Copper (II) was used as an oxidizing reagent to promote the thermal ring opening reaction of the diacid dithienylethene closed isomer. The presence of little amounts of base, nBu4NOH. 30H2O or triflic acid, CF3SO3H can alter the ring opening reaction causing the inhibition or the acceleration of the process, respectively. Finaly, the use of the diacid DTE(COOH)2 as a luminescence photo-modulator was explored using fluorescent counter-ion free ZnO nanoparticles stabilized by hexadecylamine (HDA) ligands. Unexpectedly, both diacid photoisomers were found to reduce the emission of ZnO nanoparticles, the closed colored one being the most efficient quencher of the two. The extinction of the emission intensity by electron and energy transfer processes was suggested. Although little photodegradation was occuring, the possibility of switching ON and Off the ZnOluminescence was demonstrated
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Poon, Chun-ting, and 潘俊廷. "Design and synthesis of boron (III)-containing dithienylethenes--from multi-addressable and gated photochromism to photoswitchable luminescence functions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hdl.handle.net/10722/207983.

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A series of photochromic dithienylethene-containing triarylboranes has been synthesized and characterized. The X-ray crystal structure of (4,5-bis(2,5-dimethylthiophen-3-yl)-thiophen-2-yl)dimesitylborane has been determined. An intense electronic absorption band was observed in all the triarylborane-containing compounds, corresponding to the intramolecular charge-transfer transition from the π-conjugated thiophene / fused thiophene / bithiophene to the vacant pπorbital of boron. This class of compounds was also found to bind fluoride ion such that the trigonal planar geometry of the boron center would be changed to tetrahedral, leading to a significant perturbation in the photophysical properties. Upon photo-excitation into the transition band, (4,5-bis(2,5-dimethylthiophen-3-yl)-thiophen-2-yl)dimesityl- borane and (4,5-bis-(2,5-dimethylthiophen-3-yl)-thieno[3,2-b]thiophen-2-yl)- dimesitylborane displayed multi-addressable photochromic reactivities upon addition of fluoride, in which a green solution was found in the closed form of the unbound compounds, while they changed to a purple color upon fluoride binding. Interestingly, both (4',5'-bis(2,5-dimethyl-thiophen-3-yl)-2,2'- bithiophen-5-yl)dimesitylborane and (4',5'-bis(2,5-dimethyl-thiophen-3-yl)-2,2'- bithiophen-3-yl)dimesitylborane displayed gated photochromic reactivities upon addition of fluoride, while only typical photochromic reactivity was observed in (4',5'-bis(2,5-dimethyl-thiophen-3-yl)-2,2'-bithiophen-4-yl)- dimesitylborane, indicative of a strong influence of the substituent effect on the photochromic reactivity upon incorporation of the -BMes2 group. A series of photochromic dithienylethene-containing β-diketones and the corresponding boron(III) compounds, appended with -BF2, -B(C6F5)2 and -BPh2, have been designed and synthesized. Upon photo-excitation into the transition band, typical photochromism was observed in all the dithienylethene- containing β-diketone ligands with the color changed from pale yellow to green in degassed benzene solution. Upon incorporation of the -BF2 and -B(C6F5)2 groups, near-infrared responsive photochromic behavior was observed, in which the absorption of the closed form was found to be at ca. 758-863 nm, suggesting that a pronounced perturbation of the dithienylethene was achieved by coordination of the boron(III) center. Moreover, a significant reduction in luminescence intensity of over 90 % was observed upon photocyclization, indicative of their potential application as photoswitchable luminescence materials. The thermal stability of the closed form and the activation energy for the thermal cycloreversion have also been studied on the representative compounds, 1-(4,5-bis(2,5-dimethylthiophen-3-yl)thiophen-2- yl)-butane-1,3-dione and difluoroboryl(1-(4,5-bis(2,5-dimethylthiophen-3-yl)- thiophen-2-yl)butane-1,3-dionate). A series of photochromic dithienylethene-containing BODIPY has been successfully prepared and characterized. The electronic absorption properties have been studied. These compounds showed an intense visible absorption band, corresponding to the 0-0 band of a strong S0→S1 transition of the BODIPY core, with a weak and broad absorption band at higher energy, corresponding to the S0→ S2 transition of the BODIPY core. An absorption band in the UV region was also observed in 2,3-bis(2,5-dimethyl- thiophen-3-yl)thiophene-containing derivatives, corresponding to the π→π* transitions of the dithienylethene moiety. The photochromic reactivities have also been studied such that the photostationary state was found to be reached upon irradiation in the UV region for over eight hours, while no observable changes would be obtained upon photo-excitation in the visible region. The slow conversion rate has been suggested to be attributed to the fact that a rapid excitation energy transfer could occur from the excited Th-DTE to the BODIPY moiety, rendering the suppression of the photocyclization.
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Chemistry
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Fehrentz, Timm. "Design and characterization of photochromic ligands for voltage-gated ion channels." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-148515.

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Fehrentz, Timm [Verfasser], and Dirk [Akademischer Betreuer] Trauner. "Design and characterization of photochromic ligands for voltage-gated ion channels / Timm Fehrentz. Betreuer: Dirk Trauner." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2012. http://d-nb.info/1026653541/34.

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Huber, Florian Mauritius Erasmus. "The total synthesis of (−)-nitidasin, synthetic studies toward astellatol and retigeranic acid B, and development of novel photochromic ligands for L-type voltage-gated calcium channels." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-178248.

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The first part of present doctoral thesis is dedicated to sesterterpenoid natural products, which constitute a relatively small subclass of the family of terpenoid compounds. In particular, a small number of biosynthetically closely related iso-propyl-substituted trans-hydrindane- based congeners were chosen as targets for a synthetic program that envisioned their chemical construction via a unified approach. In this context, the first total synthesis of the complex tetracarbocyclic sesterterpenoid (−)-nitidasin was disclosed. To this end, a highly convergent installation of its western cyclopentane moiety was demonstrated by use of an unprecedented Li-alkenyl addition to a versatile trans-hydrindanone building block. An efficient closure of the central 8-membered carbocycle was achieved by means of ring-closing metathesis that benefitted from finely tuned conformational parameters of the employed substrate. In summary, the developed protocol provides a scalable and continuously high yielding route for the assembly of the rare carbon skeleton of (−)-nitidasin. Furthermore, advanced synthetic studies toward the pentacyclic natural products retigeranic acid B and astellatol are described. Notably, the latter involved a biomimetic retrosynthetic proposal for the elaboration of its unique fused ring system. Two different strategies were followed in order to access viable precursors for the suggested cationic cascade, of which the latter allowed for the investigation of the mentioned key step experimentally and via computational methods. In the second section of this manuscript, the design and synthesis of the first known photochromic antagonist for L-type voltage-gated calcium channels is presented. The ultimate goal of this project lies in the establishment of a photopharmacological tool that supports the further elucidation of Ca2+-dependent cellular events, especially in neurons. The central pharmacophore of the prepared compounds was derived from the benzothiazepine drug cis-(+)-diltiazem. This parent substance also served as the starting point for the developed short and convergent semisynthetic strategy. Thirteen analogues were synthesized in total and a preliminary lead structure was identified using electrophysiolocigal methods. Based on these findings, two compounds of increased solubility and desirable photochemical properties were prepared. A possible explanation for their photodependent mode of action was proposed, which is currently subject of our ongoing investigations.
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Huber, Florian Mauritius Erasmus [Verfasser], and Dirk [Akademischer Betreuer] Trauner. "The total synthesis of (−)-nitidasin, synthetic studies toward astellatol and retigeranic acid B, and development of novel photochromic ligands for L-type voltage-gated calcium channels / Florian Mauritius Erasmus Huber. Betreuer: Dirk Trauner." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1065611102/34.

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Book chapters on the topic "Gated photochromism"

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Göstl, Robert, Antti Senf, and Stefan Hecht. "Light-Gated Chemical Reactions and Catalytic Processes." In Photochromic Materials: Preparation, Properties and Applications, 167–93. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527683734.ch5.

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Miyasaka, Hiroshi, Syoji Ito, and Yukihide Ishibashi. "Multiphoton-Gated Photochromic Reactions Induced by Pulsed Laser Excitation." In Photon-Working Switches, 225–35. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56544-4_11.

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Chen, Shangjun, Wenlong Li, and Wei-Hong Zhu. "Novel Ethene-Bridged Diarylethene Photochromic Systems: Self-Assembly, Photoswitcher, and Molecular Logic Gates." In Photon-Working Switches, 37–68. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56544-4_2.

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