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Relevant bibliographies by topics / Photochemical isomerization

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Academic literature on the topic 'Photochemical isomerization'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "Photochemical isomerization"

1

Goncharov, Yevhen, Fedir Gladkiy, Alina Abu Sheiba, and Vladislava Sklyar. "PHOTOCHEMICAL ISOMERIZATION OF OLEFINS." Bulletin of the National Technical University "KhPI". Series: Innovation researches in students’ scientific work, no. 21 (October 3, 2019): 57–61. http://dx.doi.org/10.20998/2220-4784.2019.21.09.

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Huang, Mouxin, Long Zhang, Tianrun Pan, and Sanzhong Luo. "Deracemization through photochemical E / Z isomerization of enamines." Science 375, no. 6583 (2022): 869–74. http://dx.doi.org/10.1126/science.abl4922.

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Catalytic deracemization of α-branched aldehydes is a direct strategy to construct enantiopure α-tertiary carbonyls, which are essential to pharmaceutical applications. Here, we report a photochemical E / Z isomerization strategy for the deracemization of α-branched aldehydes by using simple aminocatalysts and readily available photosensitizers. A variety of racemic α-branched aldehydes could be directly transformed into either enantiomer with high selectivity. Rapid photodynamic E / Z isomerization and highly stereospecific iminium/enamine tautomerization are two key factors that underlie the

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D’Auria, Maurizio. "The photochemical isomerization 2-furylidenetetralone." Journal of Photochemistry and Photobiology A: Chemistry 390 (March 2020): 112332. http://dx.doi.org/10.1016/j.jphotochem.2019.112332.

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Frigerio, Alberto, Alba Pusino, and Carlo Gessa. "Photochemical isomerization of fluazifop-butyl." Pesticide Science 21, no. 3 (1987): 175–79. http://dx.doi.org/10.1002/ps.2780210303.

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Sandorfy, C., and D. Vocelle. "The photochemical event in rhodopsins." Canadian Journal of Chemistry 64, no. 12 (1986): 2251–66. http://dx.doi.org/10.1139/v86-371.

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The photochemical step in the functioning of visual and bacterial rhodopsins entails cis–trans or trans–cis isomerization and changes in the state of protonation of the retinylidene Schiff base chromophore. In this review our present knowledge on these two events is discussed as well as the role of interactions between the chromophore and the surrounding protein, opsin. The relation between protonation and hydrogen bonding at the Schiff base nitrogen, the problems of stabilization of the proton bridge and charge separation are also discussed. A new proposal is made which implies Schiff base to

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Rajakumar, Perumal, Beeran Senthilkumar, and Kannupal Srinivasan. "Synthesis of Azobenzenophanes with a Large Molecular Cavity." Australian Journal of Chemistry 59, no. 1 (2006): 75. http://dx.doi.org/10.1071/ch05254.

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The design and synthesis of four large-cavity azobenzenophanes, capable of forming photochemically controllable complexes with organic guest molecules, are described. These azobenzenophanes, possessing m-terphenyl, aromatic carbonyl, and chiral BINOL spacers, were synthesized from the corresponding bisphenols and dibromides using simple O-alkylation methodology. A preliminary photochemical study was carried out on the aromatic carbonyl spacer containing azobenzenophane, and the isosbestic points for the cis–trans isomerization process appeared at 319 and 419 nm.

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Maguire, R. James. "Chemical and photochemical isomerization of deltamethrin." Journal of Agricultural and Food Chemistry 38, no. 7 (1990): 1613–17. http://dx.doi.org/10.1021/jf00097a039.

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Bussotti, Laura, Ivo Cacelli, Maurizio D'Auria, et al. "Photochemical Isomerization of Colchicine and Thiocolchicine." Journal of Physical Chemistry A 107, no. 43 (2003): 9079–85. http://dx.doi.org/10.1021/jp035507l.

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Kirilyuk, I. A., I. A. Grigor'ev, O. P. Petrenko, and L. B. Volodarsky. "Photochemical isomerization of 2H-imidazoleN-oxides." Russian Chemical Bulletin 42, no. 12 (1993): 2009–13. http://dx.doi.org/10.1007/bf00698885.

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Su, Ming-Der. "A model study on the photochemical isomerization of isothiazoles and thiazoles." Phys. Chem. Chem. Phys. 16, no. 32 (2014): 17030–42. http://dx.doi.org/10.1039/c4cp01895h.

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Dissertations / Theses on the topic "Photochemical isomerization"

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Katkova, Olga A. "Photochemical Isomerization and Stereoselective Thermal Reactions of Conjugated Nitrones." Bowling Green State University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1123003688.

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Katkova, Olga. "Photochemical isomerization and stereoselective thermal cycloaddition reactions of conjugated nitrones." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1123003688.

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Lucas, Rodrigues Leona. "Advanced photochemical reactions induced by visible light." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/235925/1/Leona%2BLucas%2BRodrigues%2BThesis%283%29.pdf.

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Nature utilizes the energy of light for chemical transformations such as photosynthesis or the visual systems in human eyes, where wavelengths from predominantly high energetic UV to harmless visible light are consumed by the respective chromophores. Therefore, the herein presented thesis focusses on developing photoreactive molecules responsive to visible light to ensure minimal harm in form of photo-bleaching or degradation to molecules, polymers or materials via three major reaction pathways: light induced ligation, bond-cleavage/rearrangement and isomerization reactions. Here, a particular

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Gozem, Samer. "Understanding the Relationship Between Thermal and Photochemical Isomerization in Visual Receptors." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1371498160.

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Zhang, Yinping. "Contribution to Photochemical Imaging of Complex Plasmonic Fields." Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0041.

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Les oligomères plasmoniques sont des assemblages couplés en champ proche de nanoparticules métalliques. Tant leurs spectres de diffusion / absorption que la distribution spatiale du champ électromagnétique peut être adaptés par l'hybridation des modes plasmoniques oligomères par des particules individuelles. Un tel contrôle sur la distribution de champ ouvre de nouvelles voies pour délivrer la lumière à une échelle de sous-longueur profonde dans des endroits ciblés (points chauds). Cependant, le contrôle actif des points chauds dans les oligomères plasmoniques et leur observation dans le champ

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Budkina, Darya S. "Ultrafast photophysical and photochemical dynamics of polyhalogenated alkanes, cycloalkanes, and transition metal complexes." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1553686775405944.

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Sun, Xue-Zhong. "Fast infrared spectroscopy in supercritical fluids." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311743.

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Duchesne, Jean-Pierre. "Nouvelle voie d'acces aux aldehydes terpeniques : synthese stereoselective des isomeres 11-trans du retinal a l'aide de sulfones." Paris 6, 1987. http://www.theses.fr/1987PA066347.

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Neff, Denis. "Complexes alleniques de cyclopentadienyle manganese dicarbonyle : acces aux allenes optiquement actifs, etude de photodecomplexations et syntheses de complexes difonctionnels." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13122.

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Perny, Sébastien. "Alignement de cristaux liquides par irradiation en lumière linéairement polarisée de film minces de polymères photoréticulables." Cachan, Ecole normale supérieure, 1998. http://www.theses.fr/1998DENS0042.

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L'objectif de ce travail de thèse a été en premier lieu de concevoir et de synthétiser quatre polymères photosensibles utilisables industriellement comme films d'alignement des cristaux liquides. Dans un deuxième temps, des études par spectroscopie UV et IR ont permis de caractériser l'anisotropie et l'évolution de la composition de ces matériaux en cours d'irradiation en lumière linéairement polarisée. Dans le cas général, il a ainsi été possible de mettre en évidence la compétition de deux photo réactions : la cycloaddition 2+2 et l'isomérisation trans/cis. Ainsi, trois espèces cohabitent au

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Book chapters on the topic "Photochemical isomerization"

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Åberg, U., E. Åkesson, I. Fedchenia, and V. Sundström. "Barrierless Photochemical Isomerization." In Ultrafast Phenomena VIII. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84910-7_196.

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Li, P., X. G. Chen, and S. A. Asher. "UV Resonance Raman Studies of the Photochemical Dynamics of N-Methylacetamide Isomerization." In Spectroscopy of Biological Molecules. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0371-8_19.

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Abbaspour Tehrani, K., and N. De Kimpe. "Photochemical Isomerization of Pyridines." In Heteroatom Analogues of Aldehydes and Ketones. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-027-00288.

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Inoue, Yoshihisa, and Tadashi Mori. "Photochemical Isomerization of Cycloalkenes." In CRC Handbookof Organic Photochemistry and Photobiology, Volumes 1 & 2, Second Edition. CRC Press, 2003. http://dx.doi.org/10.1201/9780203495902.ch16.

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"Photochemical Isomerization of Cycloalkenes." In CRC Handbook of Organic Photochemistry and Photobiology, Volumes 1 & 2. CRC Press, 2003. http://dx.doi.org/10.1201/9780203495902-22.

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"Photochemical Degradation." In Organic Chemistry of Drug Degradation. The Royal Society of Chemistry, 2012. http://dx.doi.org/10.1039/bk9781849734219-00165.

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In this chapter, a number of commonly observed non-oxidative photodegradation pathways are covered first, including photochemical decarboxylation, isomerization, and dehalogenation. In the second category of oxidative photodegradation, type I and type II mechanisms of photo-induced free radical formation and photosensitized singlet oxygen formation are discussed, respectively, followed by a discussion of the photodegradation reactions caused by these two types of mechanisms.

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Maurizio, D’auria. "Photochemical Isomerization of Pentaatomic Heterocycles." In Advances in Heterocyclic Chemistry. Elsevier, 2001. http://dx.doi.org/10.1016/s0065-2725(01)79021-6.

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Arai, Tatsuo. "Photochemical cis-trans Isomerization in the Triplet State." In Organic Molecular Photochemistry. CRC Press, 2020. http://dx.doi.org/10.4324/9781003065012-3.

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Arai, Tatsuo. "Photochemical cis-trans Isomerization in the Triplet State." In Organic Molecular Photochemistry. CRC Press, 2020. http://dx.doi.org/10.1201/9781003065012-3.

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Rao, V. Jayathirtha. "Photochemical cis-trans Isomerization from the Singlet Excited State." In Organic Molecular Photochemistry. CRC Press, 2020. http://dx.doi.org/10.4324/9781003065012-4.

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Conference papers on the topic "Photochemical isomerization"

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Åberg, Ulf, and Villy Sundström. "Photochemical Isomerization in the Absence of a Potential Barrier." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/up.1992.mc31.

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Different time-resolved spectroscopic techniques, both in the picosecond and sub-picosecond regimes have been used to investigate the photophysics of the isomerization reaction of the molecule 1,1‘-diethyl-4,4‘-cyanine (fig.1a). The molecule is characterized by a very short excited state lifetime with a linear viscosity dependence over a wide viscosity range and no, or a negative temperature dependence of the reaction rate [1]. We therefore believe that this molecule can be a representative of the barrierless reaction type (fig. 1a).

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2

Ikeda, Tomiki, and Osamu Tsutsumi. "Liquid Crystalline Materials for Photonics: Optical Switching by Means of Photochemical Phase Transition of Liquid-Crystalline Azobenzene Films." In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.wd63.

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Isothermal phase transition of liquid crystals (LCs) can be induced reversibly by photochemical reaction of guest molecules incorporated into the LC phase at concentrations of 1 ~ 5 mol%. Such photoresponsive molecules as azobenzene and spiropyran derivatives have been proved to be effective guest molecules to bring about the photochemical phase transition. 1-5 The mechanism of the photochemical phase transition is interpreted in terms of the change in the molecular shape of the guest molecules by the photochemical reaction. For example, trans-azobenzenes are rod-like shape, stabilizing the LC

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Wang, Q., R. W. Schoenlein, L. A. Peteanu, S. J. Rosenthal, R. A. Mathies, and C. V. Shank. "Femtosecond Vibrationally Coherent Photochemistry in the Primary Event in Vision." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.tub.2.

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Understanding the role of vibrational coherence in photochemical reactions is a fundamental problem in photochemistry and biology.1,2,5 Vibrational coherence may play a significant role in reactions which occur on a time scale shorter than the relevant nuclear vibrational periods. One of the fastest chemical reactions is the first step in vision,4,5,6 the 11-cis → all-trans isomerization of the retinal chromophore in rhodopsin (Fig. 1). We have demonstrated that this reaction is essentially complete in only 200 fs.4,5,6 This time is comparable to or shorter than the period of torsional vibrati

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Lindvold, L. R. "Dyed gelatin film as a storage material for volume phase holograms." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tuh5.

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Dye-sensitized gelatin is a common recording material for volume holograms. The dye acts as a spectral sensitizer in light-sensitive materials such as silver halide, dichromated gelatin, and photopolymers, mostly used as volume phase recording media. The dye, however, can be used in a pure gelatin matrix also for real-time experiments, e.g., degenerate four-wave mixing facilitated by the cis-trans isomerization of the dye to record polarization-sensitive gratings. This paper describes some preliminary results concerning an observed photoinduced crosslinking effect of a dyed gelatin. The system

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Chen, Alan G., and David J. Brady. "Surface-stabilized holograms in azo-dye doped nematic liquid crystals." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.fq2.

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We record polarization holograms in 1 % methyl red doped PCB liquid crystals by using the trans isomer absorption of the azo dye at 514 nm. The hologram is probed at 633 nm. Holographic dynamics are determined by the surface treatment of the glass substrate. In the unexposed sample, the liquid crystal molecular director is aligned by surface forces. Surface memory plays a crucial role in the holographic effects we observe. Using the Ericksen–Leslie theory, we derive the characteristic time constant for dynamic hologram formation and decay. The erasing time depends on the grating spatial freque

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Tamaoki, Nobuyuki, Yasuyuki Aoki, Masaya Moriyama, and Masatoshi Kidowaki. "Photochemical control of helical pitch of glass-forming dimeric cholesteric liquid crystals by isomerization of embedded di-mesogenic compounds with both cholesterol and azobenzene groups." In International Symposium on Optical Science and Technology, edited by Iam-Choon Khoo. SPIE, 2002. http://dx.doi.org/10.1117/12.453260.

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Hricovíni, Michal, James Asher, and Miloš Hricovíni. "The analysis of photochemical <em>anti</em>-<em>syn</em> isomerization process across the –N–N= bond in heterocyclic imines." In 6th International Electronic Conference on Medicinal Chemistry. MDPI, 2020. http://dx.doi.org/10.3390/ecmc2020-07398.

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Sekkat, Z., J. Wood, Y. Geerts, et al. "Photochromic Azo-Polymer Structures for Photonic Applications." In Organic Thin Films for Photonic Applications. Optica Publishing Group, 1995. http://dx.doi.org/10.1364/otfa.1995.wtt.3.

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In the past few years azo-dye containing polymeric films have been the subject of intensive investigations because of their possible application in the areas of optoelectronics, photonics and optical signal processing1-3. The trans ⟺cis isomerization of azobenzene derivatives in bulk polymer films has been used for producing polarization hologramms1a, optical channel waveguides1b, writing-erazing optical memories1c, and second order nonlinear-optical effects2. Langmuir-Blodgett-Khun (LBK) multilayer assemblies of azobenzene containing polymeric materials have been used for all-optical modulati

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Pullen, Stuart, Larry A. Walker, Neil Anderson, and Roseanne J. Sension. "Femtosecond Studies of Isomerization and Energy Relaxation in Small Polyenes." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.tue.28.

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Recent advances in laser technology have permitted the extension of femtosecond transient absorption studies into the deep ultraviolet. In the present investigation we have used tunable pump and probe pulses to study the photochemically initiated ring-opening reaction of 1,3-cyclohexadiene (CHD). A proper interpretation of the transient absorption signals obtained in the investigation of this ring-opening reaction requires an understanding of the vibrational and conformational relaxation processes which occur following formation of the hot cis-1,3,5-hexatriene photoproduct. To this end, we hav

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Miller, C. Cameron, Hao Li, and Laura A. Philips. "Twist and Strain: A Study in Vibrational Mode-Coupling." In High Resolution Spectroscopy. Optica Publishing Group, 1993. http://dx.doi.org/10.1364/hrs.1993.mb1.

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A homologous series of small organic molecules are used to explore the role of low frequency, large amplitude motion in vibrational mode coupling and in photochemically induced isomerization reactions. From the variation in structure in a series of substituted ethanes and strained ring systems, we can begin to link aspects of structure with the propensity for vibrational mode coupling. The molecules to be discussed include 2-fluoroethanol (2FE), 1,2-difluoroethane (DFE), 1-chloro, 2-fluoroethane (CFE), and cyclobutane.

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Reports on the topic "Photochemical isomerization"

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Altman, Leon Berthold. Thermochemical decomposition and isomerization of polysilacyclodialkynes and thermochemical and photochemical decomposition of cyclopolysilylketenes. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10161692.

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