Relevant bibliographies by topics / Photochromes

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Photochromes'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 January 2025

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Journal articles on the topic "Photochromes"

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Woodland, Walmiria, Richard Lim, Cherie Motti, Paul Irving, Jun Wang, Mark Payne, Peter C. Junk, and George Vamvounis. "Oil Spill Source Identification Using Colorimetric Detection." Australian Journal of Chemistry 72, no. 11 (2019): 874. http://dx.doi.org/10.1071/ch19336.

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The colorimetric detection of polycyclic aromatic hydrocarbons (PAHs) was investigated for the quick and easy identification of likely oil spill offenders. In this new technology, photochromic compounds were used to sense PAHs by varying their photoswitching capacity. To that end, three photochromes were designed and showed varying degrees of photoswitching inhibition, depending on PAH analyte, photochrome, and excitation wavelength. PAH mixtures that mimic oil spills showed the same varying response and demonstrated the accuracy of this technology. To prove the applicability of this technology, an array was assembled, using the three photochromes at three excitation wavelengths, and tested against authentic crude oil samples. Not only could these samples be differentiated, but also weathering of two distinctly different oil samples showed limited variation in response, demonstrating that this may be a viable technique for in situ oil identification.
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Deniz, Erhan, Stefania Impellizzeri, Salvatore Sortino, and Françisco M. Raymo. "A photoswitchable bichromophoric oxazine with fast switching speeds and excellent fatigue resistance." Canadian Journal of Chemistry 89, no. 2 (February 2011): 110–16. http://dx.doi.org/10.1139/v10-070.

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In search of strategies to regulate the photochemical and photophysical properties of photochromic oxazines, we designed a multichromophoric compound incorporating 3H-indole, benzooxazine, and 2-(4-dimethylaminophenyl)ethynyl fragments. We synthesized this molecule in two steps in an overall yield of 51%, starting from commercial precursors. The ultraviolet irradiation of this photochrome opens a [1,3]oxazine ring in less than 6 ns to generate a zwitterionic isomer with a quantum yield of 0.10. In particular, the photoinduced ring opening generates a 4-nitrophenolate anion and a 3H-indolium cation. Additionally, this process brings the 2-(4-dimethylaminophenyl)ethynyl appendage into conjugation with the 3H-indolium cation. As a result, two distinct bands for the anionic and cationic fragments of the photogenerated zwitterion appear in the visible region of the absorption spectrum. The photogenerated isomer has a lifetime of 2 µs and switches back to the original form with first-order kinetics. Furthermore, this bichromophoric photochrome tolerates hundreds of switching cycles with no sign of degradation and can be operated within rigid polymer matrices. Thus, this particular structural design can lead to the development of a new family of bichromophoric photochromes and photoresponsive materials with microsecond switching times and excellent fatigue resistances.
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Yang, Junjie, Zheng Pei, Erick Calderon Leon, Carly Wickizer, Binbin Weng, Yuezhi Mao, Qi Ou, and Yihan Shao. "Cavity quantum-electrodynamical time-dependent density functional theory within Gaussian atomic basis. II. Analytic energy gradient." Journal of Chemical Physics 156, no. 12 (March 28, 2022): 124104. http://dx.doi.org/10.1063/5.0082386.

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Following the formulation of cavity quantum-electrodynamical time-dependent density functional theory (cQED-TDDFT) models [Flick et al., ACS Photonics 6, 2757–2778 (2019) and Yang et al., J. Chem. Phys. 155, 064107 (2021)], here, we report the derivation and implementation of the analytic energy gradient for polaritonic states of a single photochrome within the cQED-TDDFT models. Such gradient evaluation is also applicable to a complex of explicitly specified photochromes or, with proper scaling, a set of parallel-oriented, identical-geometry, and non-interacting molecules in the microcavity.
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Belikov, N., O. Demina, I. Levina, A. Lukin, A. Safinova, L. Petrovskaya, Sergey Varfolomeev, and A. Khodonov. "PHOTOCHROMIC LIGANDS FOR MODIFICATION OF METAL CATIONS AND QUANTUM DOTS." Russian Journal of Biological Physics and Chemisrty 7, no. 1 (November 8, 2022): 113–22. http://dx.doi.org/10.29039/rusjbpc.2022.0492.

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In this paper, we consider the studies carried out by the authors aimed at developing new hybrid structures and methods for obtaining a family of photochromic labels capable of photocontrolled interaction with inorganic components, as well as the results of studying their photochromic behavior and the selectivity of complex formation processes. In this paper, special attention is devoted to the choice of the desired composition and structure of label molecules and the practical implementation of laboratory technology for the synthesis of a set of target compounds with specified optical parameters. The data obtained open up prospects for the use of a new generation of photochromes based on functionalized spiropyrans as new hybrid materials for the creation on their basis: metal detectors, components of photochromic systems, and prototypes of molecular electronics smart devices.
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Feczko, Tivadar, and Bojana Voncina. "Organic Nanoparticulate Photochromes." Current Organic Chemistry 17, no. 16 (July 1, 2013): 1771–89. http://dx.doi.org/10.2174/1385272811317160011.

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Benoit, J. M., K. Chevrier, C. Symonds, and J. Bellessa. "Strong coupling for bifunctionality in organic systems." Applied Physics Letters 121, no. 18 (October 31, 2022): 181101. http://dx.doi.org/10.1063/5.0116184.

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In this paper, we exploit the strong light–matter coupling to hybridize two materials for bifunctionality properties. The strong coupling has been achieved between a surface plasmon and two organic emitters: a J-aggregate cyanine dye, known for its high absorption and emission properties and a photochromic material in which absorption can be optically switched on and off. The optical properties are drastically modified between the activated and deactivated forms of the photochromic material coupled to the cyanine dye. In particular, the emission of the structure can be energy shifted by several hundreds of meV providing a way to build a tunable emission system. This system also reveals its potential for modifying the fluorescence of photochromes thanks to light–matter interaction instead of functionalization using covalent bonding.
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El Guesmi, Nizar, Saleh A. Ahmed, Ismail I. Althagafi, and Khalid S. Khairou. "Photochromism of Dihydroindolizines. Part XXI: Multiaddressable Photochromic Performances based on Pyrrolo[1,2 -b ]pyridazine photochromes: Kinetics, Substituent Effect and Solvatochromism." Journal of Photochemistry and Photobiology A: Chemistry 346 (September 2017): 287–95. http://dx.doi.org/10.1016/j.jphotochem.2017.06.014.

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Malatesta, Vincenzo, Mario Milosa, Roberto Millini, Luigi Lanzini, Piero Bortolus, and Sandra Monti. "Oxidative degradation of organic photochromes." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 246, no. 1 (May 1994): 303–10. http://dx.doi.org/10.1080/10587259408037833.

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Belikov, Mikhail Yu, Mikhail Yu Ievlev, Sergey V. Fedoseev, and Oleg V. Ershov. "Tuning the photochromic properties of chromophores containing a nitrile-rich acceptor: a novel branch in the investigation of negative photochromes." New Journal of Chemistry 43, no. 22 (2019): 8414–17. http://dx.doi.org/10.1039/c9nj01648a.

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Sponza, Alvaro D., Di Liu, Emily P. Chen, Allison Shaw, Lassana Diawara, and Melanie Chiu. "Synthesis strategies for non-symmetric, photochromic diarylethenes." Organic & Biomolecular Chemistry 18, no. 37 (2020): 7238–52. http://dx.doi.org/10.1039/d0ob01556c.

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Dissertations / Theses on the topic "Photochromes"

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Calupitan, Jan Patrick Dela Cruz. "Térarylènes photo réactifs : synthèse et études par microscopie à effet tunnel." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30016/document.

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Les diaryléthènes et leurs dérivés terrylènes sont prometteurs pour la prochaine génération de dispositifs optoélectroniques en raison de leurs excellentes propriétés photochimiques. Pour les rendre viables pour les appareils électroniques miniaturisés, il est nécessaire d'étudier cette classe de molécules au niveau unimoléculaire avec le microscope à tunnel sous vide ultra-élevé (UHV STM). Cette thèse comporte trois parties: 1) développement de terarylènes hautement sensibles à la commutation; (2) leur modification pour les études STM; et 3) les résultats de ces études STM. Pour être étudié à l'échelle de la molécule unique par STM, des terarylènes ayant une sensibilité de commutation élevée ont été sélectionnés. Ces composés présentent des rendements quantiques élevés allant jusqu'à 100%. Cependant, la réaction de cycloréversion reste faible, de sorte qu'une voie alternative, grâce à un mécanisme oxydatif à réaction en chaîne, a été recherchée. Dans une première partie, nous montrons que l'efficacité et la vitesse de cette réaction peuvent être contrôlées par la fixation de groupes aromatiques sur les carbones réactifs. Dans la deuxième partie, nous avons fonctionnalisé ces molécules afin de les étudier par STM en introduisant des groupes tert-butyle et chlorure. Tout en préservant leurs excellentes propriétés photochimiques, les groupes tert-butyle présentent un excellent contraste lumineux dans les images STM, ils minimisent aussi l'agrégation de ces molécules sur la surface et découplent légèrement les molécules de la surface. Les atomes de chlore permettent de contrôler les assemblages moléculaires sur des substrats isolants de type bicouche de NaCl cristalline précédemment déposés sur un substrat métallique. Dans la troisième partie, les résultats de STM sont présentés. Nous avons développé une nouvelle approche ascendante pour la formation reproductible de nano-assemblages du terarylène non modifié à 77 K. Quant au terarylène modifié par les groupes tert-butyle, il présente à 5 K sur une surface d'Ag (111) différentes formes qui, grâce à la position des groupes tert­butyles à contraste élevé et à l'aide de calculs DFT, ont pu être assignées comme étant différentes conformations de surface de la molécule. Sur NaCl / Ag (111), il a été possible de visualiser les états occupés et inoccupés de la molécule. Cela illustre que, pour ces applications, des molécules avec des propriétés appropriées peuvent être des candidates intéressantes pour des études STM afin d'obtenir des informations sur leurs propriétés à l'échelle de la molécule unique. De telles molécules peuvent être optimisées pour tenir compte de la surface, car sa simple présence peut induire un comportement bien différent de celui obtenu en solution. Cette thèse ouvre les terarylènes à des applications futures nécessitant une surface solide
Photoswitching diarylethenes, and their terarylene derivatives, are promising for the next generation optoelectronic devices because of their excellent photochemical properties. To make them viable for miniaturized electronic devices, it is necessary to study this class of molecules at the single molecular level by scanning tunneling microscopy under ultra-high vacuum (UHV STM). This thesis has three parts: 1) development of terarylenes highly sensitive to switching; (2) their modification for STM studies; and 3) results of STM investigations. To be studied at the single molecular level by STM, terarylenes with high switching sensitivity have been selected. These compounds display high quantum yields of up to 100 %. However, the cycloreversion reaction remains low so an alternative route, through a chain-reaction oxidative mechanism, has been sought. In the first part, we show that the efficiency and speed of this reaction may be controlled by attachment of aromatic groups on the reactive carbons. In the second part, we functionalized these molecules for STM studies by attaching tert-butyl and chloride groups. These substituents preserve their excellent photochemical and switching properties while tert-butyl groups show bright contrast in STM images, minimize aggregation of these molecules on the surface, and slightly decouple the molecule from the surface. The chlorine group has been introduced to direct their surface assembly on insulating substrates composed of crystalline NaCl bilayer previously grown over a metallic substrate. In the third part, results of STM are presented. We developed a new bottom-up approach for forming reproducible nanoassemblies of the unmodified terarylene at 77 K. Meanwhile, at 5 K, the terarylene functionalized with tert-butyl groups present different forms on the Ag(111) surface. From the positioning of the high-contrast tert-butyl groups and with the aid of DFT calculations, we assign different conformations of the molecule on the surface. On NaCl/Ag(111), direct visualization of the occupied and unoccupied states could be achieved. This illustrates that for these applications, molecules with appropriate properties can be interesting candidates for STM studies to obtain information at the single molecular level. Such molecules may be redesigned with a consideration of the surface as its mere presence may induce behavior previously unobserved or neglected if they were studied in solution. This thesis opens terarylenes to future applications which require a solid surface
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Kameneva, Olga. "Matériaux hybrides organiques-inorganiques photochromes." Paris 13, 2009. http://www.theses.fr/2009PA132028.

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Différents nanocomposites hybrides formés d’un réseau d’oxyde de titane et de poly(hydroxyéthyl métahcrylate) ont été élaborés. La synthèse suivie permet d’obtenir des monolithes optiquement transparents et de s’affranchir des phénomènes de fissuration et de retrait [<10%] souvent rencontrés lors de l’élaboration de pièces massives via le procédé sol-gel. Nous avons pu observer des propriétés optiques, en terme de photochromisme, pour les matériaux similaires à celles de gels humides : une intensité de coloration élevée des échantillons, et une stabilité de coloration très longue. Ces propriétés s’interprètent par la possibilité de piéger les électrons photoinduits sous la forme de Ti3+ responsables de la coloration ; et la possibilité de transférer et piéger les trous dans la composante organique. De plus, la présence d’une composante polymère vitreuse limite fortement la diffusion de l’oxygène et ralentie considérablement le processus réversible de décoloration. Nous avons démontré qu’il est indispensable de générer un réseau continu macroscopique d’entités oxo photoactives incorporées dans la phase polymère et d’avoir une interface hybride très étendue afin d’accommoder la réduction des Ti4+en Ti3+par la proximité de fonctions oxydables, pour atteindre des rendements de coloration élevés. Ces matériaux sont alors de bons candidats pour l’élaboration de dispositifs optiques pour la photo-impression 2D et 3D. Des photopatternings avec une résolution de 5 microns ont pu être ainsi réalisés par le processus à 2 photons en utilisant un laser femtoseconde Ti: sapphire (800 nm).
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Pavageau, Corentin. "Molécules et Nanosystèmes Multi-émissifs et Photocommutables." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN026/document.

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Ce projet de thèse consiste dans un premier temps à synthétiser des systèmes moléculaires multifonctionnels possédants un grand nombre d’entités fluorescentes et photochromes. De telles architectures nécessitent ensuite une étude photophysique poussée pour caractériser leurs propriétés d’émission photo-activée pour jouer le rôle de sondes moléculaires fluorescentes super-résolutives en imagerie de fluorescence. En effet, l’accès aux observations nanométriques par microscopie optique est actuellement un domaine de recherche extrêmement actif et prometteur. Ici, la combinaison astucieuse de molécules photochromes (de type diaryléthène) et fluorescentes (de type dicyanométhylène pyranes ou benzophénoxazines) à l’échelle nanométrique, grâce à des plateformes moléculaires telles que des oligosaccharides et des peptides fonctionnalisés par “chimie click”, doit permettre d’obtenir des structures aux géométries variées avec des distances et orientations inter-chromophores diverses, dont l’optimisation doit conduire à des interactions efficaces menant à l’émergence d’effets collectifs coopératifs. Pour ces assemblages moléculaires mixtes, il est attendu que la présence d’une unité photochrome puisse engendrer l’extinction de fluorescence de plusieurs fluorophores lorsque ces entités sont situées à une distance appropriée pour que le transfert d’énergie ait lieu de manière amplifiée. Par ailleurs, même une faible conversion des photochromes doit permettre d’atteindre un contraste de fluorescence extrêmement efficace avoisinant 100% et ainsi obtenir des super-molécules dont la photo-commutation serait rapide et économe en photons. Il s’agira enfin de démontrer que les systèmes moléculaires multichromophoriques ainsi optimisés présentent le comportement souhaité à l’échelle de la molécule unique pour l’imagerie de fluorescence super-résolution
The synthesis of photoswitchable emissive molecular system still represents a challenge, in order to develop fluorescence-based devices for nanotechnologies. In the last decade, excitation energy transfer processes (EET) have been advantageously employed to design photoswitchable fluorescent molecular systems between a photochromic dye and an appropriate fluorescent molecule. More recently, photochromic dyes of particular interest, showing no emission in the open-form (P-OF) but a strong emission signal in the closed-form (P-CF), have been developed. Such molecules allow a multi-emission switch when combined with a fluorescent moiety. In this project, we will design and synthesize fluorescent photochromic diarylethene covalently linked to different fluorophores, such as benzothiadiazole (BTD) and BODIPY derivatives. By choosing a fluorophore moiety with blue/green emission (F) and a photochromic moiety with orange/red emission in closed-form (P-CF), EET can occur between F and P-CF leading to photoswitchable multi-emission properties. Photophysical characteristics of dyads will be studied by spectroscopy with the aim of presenting their light-controllable optical properties and the intramolecular EET processes between fluorescent and photochromic moieties
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Colombier, Isabelle. "Effets photomécaniques dans les cristaux organiques photochromes." Université Joseph Fourier (Grenoble), 2005. https://tel.archives-ouvertes.fr/tel-00009971.

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Le photochromisme est la propriété que possèdent certaines espèces chimiques de présenter une transformation réversible, induite par la lumière, entre deux états ayant des spectres d'absorption séparés. Suivant l'amplitude des modifications structurales photoinduites, la réaction peut se produire dans des milieux plus ou moins rigides. Dans ce travail, nous nous intéressons à la phase cristalline et plus particulièrement à l'étude des propriétés spectroscopiques de nano- et microcristaux de molécules organiques photochromes. Dans ce but, nous avons développé un banc de microspectroscopie avec une résolution de 500nm, nous permettant d'étudier des cristaux de taille submicrométrique. Lors de l'étude de monocristaux d'un diarylethene, nous avons observé un effet photomécanique original: la réaction photochrome s'accompagne dans ce cas de sauts pouvant mesurer jusqu'à 4mm pour des cristaux de taille micrométrique. D'autre part, lorsqu'on empêche les cristaux de sauter, on observe la formation d'un réseau de fractures parallèles et équidistantes à la surface des cristaux. Ces effets correspondent à la traduction macroscopique de l'accumulation de contraintes ponctuelles dans le cristal lors de la photoréaction. Nous défendons l'hypothèse selon laquelle sauts et fractures ont un antécédent commun: une déformation périodique de la surface qui pourrait être liée à une instabilité de Grinfeld
Photochromism is defined as a reversible photoisomerization belween Iwo forms having different absorption spectra. The reaction can occur even in the crystalline state when the photoinduced molecular structural changes are not too large. Ln this report, we study spectroscopic properties of nano- and microcrystals of organic photochromic molecules. For this purpose, we have developed a microspectroscopy setup with a 500nm resolution. During the study of single-crystals of a diarylethene, we have observed a new photomechanical effect. As usual, colorless single crystals turn colored under UV-irradiation. However, when the energy absorbed by crystals reaches about 10~J, they jump. Moreover, when we prevent crystals from jumping, parallel, equidistant cracks appear due to elastic energy dissipation. These Iwo photomechanical effects correspond to the relaxation of the stresses accumulated in crystals during the photoreaction. We suggest the hypothesis that jumps and cracks are preceded by a periodic surface deformation which could be related to a Grinfeld instability
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Guérin, Juliette. "Synthèse et étude de ligands diaryléthènes photochromes de type Salen : Compréhension de l'interaction métal-photochrome pour la commutation optique." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00979420.

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Le travail de recherche s'intéresse au contrôle, par la lumière, des propriétés de la matière. Dans ce vaste domaine, notre équipe s'est focalisée sur les molécules organiques photochromes de type diaryléthène. Nous avons cherché à étudier des interactions de type métal-photochrome et aspirons ainsi à moduler les propriétés optiques, redox ou l'affinité des ligands pour un métal ou un ion. Un premier ligand biphotochrome de type terthiazole a été synthétisé, comportant une sphère de coordination de type Salen (N2O2) proche du cœur photochrome. Le ligand peut effectuer une réaction de photocyclisation ou un transfert de proton à l'état excité (ESIPT). Ces propriétés ont été étudiées par spectroscopie UV-Visible stationnaire et transitoire nanoseconde et femtoseconde. Ce ligand a été valorisé par la complexation et des calculs quantiques de type DFT ont permis d'apporter des éléments de réponse quant au quenching du photochromisme pour certains complexes. Une deuxième famille de photochrome-Salen a été synthétisée en éloignant la sphère de coordination du cœur photochrome. Une étude de l'influence de différents substituants sur les propriétés a été menée. Finalement, le travail se conclue par l'étude d'un système photochrome dont le potentiel redox est modulé par la réaction photochimique. Cette modulation du potentiel a permis de contrôler, par la lumière, un transfert d'électron entre le diaryléthène et un complexe métallique approprié.
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Chamontin, Karine. "Synthèse et propriétés photochromiques de systèmes moléculaires et supramoléculaires de type spirooxazine et 2H-chromène." Aix-Marseille 2, 1997. http://www.theses.fr/1997AIX22102.

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Le principal objectif visait a modifier la structure des spirooxazines pour apporter des changements significatifs a leurs proprietes photochromiques. Ainsi une nouvelle famille de composes (spiroazahomoadamantane-naphtoxazines) a ete elaboree par modification de la partie gauche. Des spiroindoline-naphtoxazines substituees sur la partie droite (sur les positions 5, 8, 9 et 10) ont ete preparees. Des groupements electron-attracteurs ont plus specialement ete places en position 5, en s'efforcant d'etendre la chaine de conjugaison, par l'intermediaire de reactions de wittig ou de knoevenagel effectuees directement sur la molecule photochromique preformee. Une approche nouvelle consistant a coupler deux photochromes (chromene et/ou spirooxazine) par des positions et des jonctions variees a ete developpee. Pour atteindre cet objectif nous avons au prealable fonctionnalise les spirooxazines et les chromenes. L'etude spectrocinetique de l'equilibre photochromique des composes synthetises a ete realisee par deux methodes experimentales complementaires : la photolyse a eclairs et l'irradiation continue. L'analyse des parametres obtenus a permis de determiner l'influence des modifications structurales sur les proprietes photochromiques. Les nouvelles spirooxazines synthetisees permettent d'elargir la gamme d'absorption electronique des formes colorees entre 560 et 665 nm. Les premieres etudes effectuees sur les nouveaux bichromophores mettent en lumiere l'importance de la nature et de la position de la jonction sur le comportement photochromique de ces supramolecules. Dans le cas de certains systemes bi-oxazines ou bi-chromenes nous avons pu mettre en evidence une grande stabilite thermique des formes colorees mais egalement une activation photochimique de la reaction de decoloration. Ces nouvelles proprietes ouvrent la voie a de nouvelles recherches aussi bien fondamentales qu'appliquees.
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Lévi, David. "Synthèse, étude et approche du comportement photochimique complexe et biphotochromes en séries chroménique et oxazinique." Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22062.

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Anguille, Stéphane. "Nouveaux métallocényl-[2H]-Benzopyranes : Synthèse, propriétés photochromiques et thermochromiques." Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22006.

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Lévesque, Isabelle. "Propriétés ionochromes et photochromes de dérivés du polythiophène." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ33046.pdf.

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Hannesschlager, Patrick. "Synthese et proprietes spectrocinetiques de nouveaux photochromes organometalliques." Aix-Marseille 2, 1998. http://www.theses.fr/1998AIX22016.

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Bien que les photochromes organiques aient atteint un stade avance en ce qui concerne leurs applications industrielles, ils restent encore un axe de recherche important. Jusqu'a present les etudes visant a modifier le comportement photochromique des composes heterocycliques ou spiro heterocycliques ont porte soit sur les substitutions soit sur des modifications importantes des structures heterocycliques, mais toujours dans le domaine de la chimie organique. L'originalite de notre travail consiste a l'introduction d'un substituant d'origine metallique, le chrome tricarbonyle. Lors de la partie synthetique de ce travail, nous avons mis en evidence la regioselectivite de plusieurs methodes de complexation sur la famille des 2h-chromenes. De la partie de l'etude spectrocinetique et comparative des differents composes formes, il ressort que la complexation par le chrome tricarbonyle n'affecte pas de facon considerable la longueur d'onde d'absorption maximale, par contre les cinetiques de coloration et de decoloration sont tres ralenties. Il en decoule que l'absorbance maximale se trouve fortement diminuee, mais que grace a ces ralentissements, certaines molecules non photochromique a temperature ambiante, se revelent avoir des proprietes photochromiques apres complexation. L'ensemble de ces resultats presente un attrait interessant du point de vue synthetique dans la recherche de nouvelles molecules a caractere photosensible.
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Books on the topic "Photochromes"

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El’tsov, A. V. Organic Photochromes. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8585-5.

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1948-, Glebov L. B., and T͡S︡ekhomskii Viktor Alekseevich, eds. Physics and chemistry of photochromic glasses. Boca Raton: CRC Press, 1998.

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Crano, John C., and Robert J. Guglielmetti. Physiochemical studies, biological applications, and thermochromism. New York: Kluwer Academic/Plenum Publishers, 2002.

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Bradshaw, Colin. Fast photochromic systems. Salford: University of Salford, 1988.

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Irie, Masahiro, Yasushi Yokoyama, and Takahiro Seki, eds. New Frontiers in Photochromism. Tokyo: Springer Japan, 2013. http://dx.doi.org/10.1007/978-4-431-54291-9.

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McArdle, C. B., ed. Applied Photochromic Polymer Systems. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-3050-9.

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Heinz, Dürr, and Bouas-Laurent Henri, eds. Photochromism: Molecules and systems. Amsterdam: Elsevier, 1990.

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Irie, Masahiro. New Frontiers in Photochromism. Tokyo: Springer Japan, 2013.

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B, McArdle C., ed. Applied photochromic polymer systems. Glasgow: Blackie, 1992.

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Heinz, Dürr, and Bouas-Laurent Henri, eds. Photochromism: Molecules and systems. Amsterdam: Elsevier, 2003.

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Book chapters on the topic "Photochromes"

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Dietz, F., and A. V. El’tsov. "Theoretical Studies of the Photochromism of Organic Compounds." In Organic Photochromes, 1–44. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8585-5_1.

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Mostoslavskii, M. A. "Photochromic Thioindigoid Dyes." In Organic Photochromes, 45–104. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8585-5_2.

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Fanghänel, D., G. Timpe, and V. Orthman. "Photochromic Compounds with N=N and C=N Chromophores." In Organic Photochromes, 105–75. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8585-5_3.

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El’tsov, A. V., A. I. Ponyaev, É. R. Zakhs, D. Klemm, and E. Klemm. "Photochromic Tautomeric Systems." In Organic Photochromes, 177–228. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8585-5_4.

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Minkin, V. I., V. A. Bren’, and A. É. Lyubarskaya. "Organic Photochromes for Solar Energy Storage." In Organic Photochromes, 229–44. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8585-5_5.

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Kuz’min, M. G., and M. V. Koz’menko. "Luminescence of Photochromic Compounds." In Organic Photochromes, 245–65. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-8585-5_6.

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Krayushkin, M. M., and M. A. Kalik. "1,2-Bis(Hetaryl)Perfluorocyclopentenes as Unique Thermally Irreversible Photochromes. Synthesis and Structural Singularities." In Fluorine in Heterocyclic Chemistry Volume 1, 515–53. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04346-3_12.

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Abe, Jiro, Hiroaki Yamashita, and Katsuya Mutoh. "Photochromism." In Encyclopedia of Polymeric Nanomaterials, 1–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36199-9_119-1.

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Dessauer, R., and J. P. Paris. "Photochromism." In Advances in Photochemistry, 275–321. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470133316.ch8.

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Gooch, Jan W. "Photochromic." In Encyclopedic Dictionary of Polymers, 533. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8667.

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Conference papers on the topic "Photochromes"

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Shuchi, Nuren, Tyler Adams, V. Paige Stinson, Micheal J. McLamb, Dustin Louisos, Glenn D. Boreman, Michael G. Walter, and Tino Hofmann. "Complex Dielectric Function of Photochromic Thiazolothiazole Embedded Polymers Determined by Spectroscopic Ellipsometry." In CLEO: Applications and Technology, JTh2A.10. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jth2a.10.

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The complex dielectric function of photochromic thiazolo[5,4-d]thiazole embedded in polymer is reported in the spectral range from 0.8 to 2.5 eV. Strong absorption bands in the measured spectral range are observed depending upon its redox states.
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Gerbreders, A., J. Teteris, and V. Kolobjonoks. "Holographic recording in polymer composites of organic photochromes and chalcogenides." In Sixth International Conference on Advanced Optical Materials and Devices, edited by Janis Spigulis, Andris Krumins, Donats Millers, Andris Sternberg, Inta Muzikante, Andris Ozols, and Maris Ozolinsh. SPIE, 2008. http://dx.doi.org/10.1117/12.815457.

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Kononov, M. A., Alexander M. Prokhorov, V. V. Savransky, S. I. Valjansky, and S. V. Vinogradov. "Devices for controlling light based on the surface plasmon resonance effect using photochromes." In ICONO '98: Laser Spectroscopy and Optical Diagnostics--Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, edited by Konstantin N. Drabovich, V. I. Emelyanova, and Vladimir A. Makarov. SPIE, 1999. http://dx.doi.org/10.1117/12.342347.

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Rayfield, G. W. "A photochromic material for non-destructive readout using one wavelength." In Symposium on Optical Memory. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/isom.1996.otub.23.

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Optical data storage offers significant improvement over existing storage technology for high-density and high-transfer-rate data storage. A limitation in the development of this technology is the lack of a suitable optical-recording material. A suitable material would have high resolution, permanent data­storage capabilities, non-destructive readout, good sensitivity (for both writing and erasure), high photochemical and thermal stability, and optical-erase capability. Photochromies meet many of the material needs but suffer from a key limitation: Information is lost by repeated reading unless a different wavelength is used for reading and writing. This paper describes a photochromic material, bacteriorhodopsin, in which an external electric field switches its photochromic behavior. Optical information stored in the film is nonvolatile but can be erased with blue light. Non-destructive readout uses red light with the same wavelength of as that used for writing.
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Chen, Anyin, Shouzhi Pu, Zhanggao Le, and Gang Liu. "Synthesis, Photochromism and Photoinduced Anisotropy of a New Photochromic Diarylethene." In 2009 Pacific-Asia Conference on Circuits, Communications and Systems (PACCS). IEEE, 2009. http://dx.doi.org/10.1109/paccs.2009.83.

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Liu, Gang, Shouzhi Pu, Congbin Fan, and Weijun Liu. "Synthesis, photochromism, and holographic optical recording of photochromic diarylethene bearing fluorine atoms." In Eighth International Symposium on Optical Storage and 2008 International Workshop on Information Data Storage, edited by Fuxi Gan. SPIE, 2008. http://dx.doi.org/10.1117/12.822473.

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Kawamoto, Yuki, Naoki Inoue, Yuto Ito, Akihiko Azetsu, Shun Takahashi, Masayuki Ochiai, Michael Stark, et al. "Clarification of Fuel and Oil Flow Behaviour Around the Piston Rings of Internal Combustion Engines: Visualization of Oil and Fuel Behaviour by Photochromism in Gasoline Engine Under Transient Operating Conditions." In 2023 JSAE/SAE Powertrains, Energy and Lubricants International Meeting. 10-2 Gobancho, Chiyoda-ku, Tokyo, Japan: Society of Automotive Engineers of Japan, 2023. http://dx.doi.org/10.4271/2023-32-0046.

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<div class="section abstract"><div class="htmlview paragraph">Photochromism is a reversible color change phenomenon based on chemical reactions caused by light illumination. In the present study, this technique is applied to visualize the lubricating oil and fuel around the piston rings in the gasoline engine. The oil film was colored with a UV laser and photographed by synchronizing the shutter of a high-speed camera with a flashlight. The color density was evaluated as a value of absorbance, calculated from images taken at two different wavelengths and two different times before and after the coloration. The authors performed photochromism visualization experiments in an engine under motored operation. However, using photochromic dyes that are robust to temperature changes makes it possible to visualize the engine under fired operation. The experiment was conducted mainly by switching to the motored operation for a fixed time between the fired operations. The visualization results showed that during the motored operation, lubricating oil colored on the piston land was transported over the piston ring to the top of the piston. The time variation of the absorbance distribution on the land was quantitatively evaluated. Furthermore, the visualized results by photochromism were compared with the results of oil emission measurement based on mass spectrometry supported by aerosol particle measurement. A time delay was confirmed for the oil in the second land to reach the top of the piston by comparison with experimental results of oil emission measurement. It was also confirmed that photochromism allows visualization of fuel movement in the engine.</div></div>
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Agui, Juan C., and Lambertus Hesselink. "Use of holography in velocity gradient measurement in photochromic fluids." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.tui1.

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The application of volumetric diffraction gratings in photochromic materials to the measurement of velocity gradients in fluid flows is presented. The process involves the writing of a crossbeams hologram by two coherent pulsed beams that intersect inside a fluid to which a photochromic dye has been added. The hologram is continuously read at the proper Bragg angle by a third beam of lower intensity and different wavelength. The effect of flow shearing is to change the main orientation of the plane of the fringes of the hologram, which in turn reflects in a change of the angular properties of the readout beam. This is carried out until the hologram fades out by diffusion or it moves out of the Bragg condition. We show the optimization of the writing of the cross-beam grating in an optically thick material (like the photochromies used) as well as the wavelength for the most efficient reading of such gratings. Velocity gradients in a carefully controlled flow are shown and compared to alternative established methods and theoretical profiles. Finally, we discuss several alternative geometries capable of measuring different components of the velocity gradient tensor as well as multichannel arrangements capable of measuring vorticity components (e.g., ω y = ∂v z /∂x− ∂v z /∂z).
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Liu, Hongliang, Shouzhi Pu, Shiqiang Cui, and Gang Liu. "Photochromism and Optical Recording of a Novel Photochromic Diarylethene Bearing Thiazole and Biphenyl Unit." In 2011 Symposium on Photonics and Optoelectronics (SOPO 2011). IEEE, 2011. http://dx.doi.org/10.1109/sopo.2011.5780557.

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Liu, Gang, Shouzhi Pu, and Congbin Fan. "Efficient synthesis, photochromism, and holographic optical recording of a photochromic diarylethene bearing a pyrrole unit." In Photonics and Optoelectronics Meetings 2009, edited by Masud Mansuripur, Changsheng Xie, and Xiangshui Miao. SPIE, 2009. http://dx.doi.org/10.1117/12.843328.

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Reports on the topic "Photochromes"

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Davis, Jeffrey A., and Mary Thomas. Photochromic Materials Study. Fort Belvoir, VA: Defense Technical Information Center, September 1985. http://dx.doi.org/10.21236/ada163140.

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Cherepy, N., and R. Sanner. Synthesis and Optical Properties of Photochromic Perinaphthothioindigo. Office of Scientific and Technical Information (OSTI), February 2005. http://dx.doi.org/10.2172/15016022.

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Chaiken, Joseph. Improved Materials for Photochromic Optical Memory Subsystem (POMS). Fort Belvoir, VA: Defense Technical Information Center, May 2000. http://dx.doi.org/10.21236/ada378152.

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Davis, Jeffrey A., and Richard L. Lee. Study of Photochromic Materials for Use in Optical Signal Processing. Fort Belvoir, VA: Defense Technical Information Center, November 1987. http://dx.doi.org/10.21236/ada189068.

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BURNS, ALAN R., DARRYL Y. SASAKI, R. W. CARPICK, JOHN A. SHELNUTT, and C. JEFFREY BRINKER. Functional Materials for Microsystems: Smart Self-Assembled Photochromic Films: Final Report. Office of Scientific and Technical Information (OSTI), November 2001. http://dx.doi.org/10.2172/789579.

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Goddard, J. D. Non-Invasive Photochromic-Tracer Studies of Particulate Suspensions and Granular Media. Fort Belvoir, VA: Defense Technical Information Center, August 1997. http://dx.doi.org/10.21236/ada329666.

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Pollagi, T. P., M. B. Sinclair, and S. J. Jacobs. Final report: Photochromism as a switching mechanism for electronically active organic materials. Office of Scientific and Technical Information (OSTI), July 1997. http://dx.doi.org/10.2172/505264.

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Cozzens, Robert F. Analysis and Evaluation of Technical Data on the Photochromic and Non-Linear Optical Properties of Materials. Fort Belvoir, VA: Defense Technical Information Center, June 1990. http://dx.doi.org/10.21236/ada223855.

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