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Photoswitch

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140: 63: 69:: Azobenzene undergoes a E to Z photoisomerization in which the Z isomer is more polar, has shorter bonds, and a bent and twisted geometry. Hydrazone undergoes photoisomerization with long thermal half lives of thousands of years. Spiropyran and Merocyanine undergo ring opening/closing mechanisms upon photo irradiation. Diarylethene and donor-acceptor Stenhouse adducts exhibit changes in color upon photoisomerization. Stilbene is a model photoswitch for studying photochemistry. 215: 52: 3080: 462:
states. Light can be used to switch between these states, resulting in remote control of a drug's activity. Photoswitches have also been shown modulate surface energy properties which can control how the photoswitchable shell interacts with nanoparticles. Pharmaceutical encapsulation and distribution
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When a photochromic compound is incorporated into a suitable catalytic molecule, photoswitchable catalysis can result from the reversible changes in geometric conformation upon irradiation with light. As one of the most widely studied photoswitches, azobenzene has been shown to be an effective switch
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Although the mechanism for photoisomerization is still debated amongst most scientists, increasing evidence supports cis-/trans- isomerization of polyenes favoring the hula twist rather than the one-bond-flip. The one-bond-flip isomerizes at the reactive double bond while the hula twist undergoes a
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kinetics. Photoswitches can be in solution or in the solid state; however, switching in the solid state is more difficult to observe due to the lack of molecular freedom of motion, solid packing, and the fast thermal reversion to the ground state. Through chemical modification,
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used in electronics. Through the attachment of photoswitches onto the surfaces of various substrates, the work function can be changed. For example, the incorporation of diarylethenes as a self-assembled monolayer on a gold surface shows promise in optoelectronic devices.
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Due to one of the photoisomers being more stable than the other, isomerization from the stable to metastable isomer results in a conversion of light energy into free energy as a form of a chemical potential and has applications in storing solar energy.
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can be achieved when the irradiation of light no longer converts one form of an isomer into another; however, a mixture of cis- and trans- isomers will always exist with a higher percentage of one versus the other depending on the photoconditions.
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Rifaie-Graham, Omar; Yeow, Jonathan; Najer, Adrian; Wang, Richard; Sun, Rujie; Zhou, Kun; Dell, Tristan N.; Adrianus, Christopher; Thanapongpibul, Chalaisorn; Chami, Mohamed; Mann, Stephen; de Alaniz, Javier Read; Stevens, Molly M. (2022-11-07).
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states as a function of the photostationary state. Incorporation of photoswitches into nematic liquid crystals can change self-assembly, crystal packing, and the light reflecting properties of the supramolecular interactions.
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to generate long term stable polymer shapes. Light-gated optical windows that can change the absorbance properties can be made by chirally doping liquid crystals with hydrazone photoswitches or by kinetically trapping various
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Zhang X, Koz B, Bisoyi HK, Wang H, Gutierrez-Cuevas KG, McConney ME, et al. (December 2020). "Electro- and Photo-Driven Orthogonal Switching of a Helical Superstructure Enabled by an Axially Chiral Molecular Switch".
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Through the incorporation of photoswitches into biological molecules, biological processes can be regulated through controlled irradiation with light. This includes photocontrol of peptide conformation and activity,
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Diarylethenes form stable molecular conduction junctions when placed between graphene electrodes at low and room temperature and act as a photo-electrical switch. By combining a photoswitch, containing various
252:, etc. Rhodopsins are highly efficient photochromic compounds that can undergo fast photoisomerization and are associated with various retinal proteins along with light-gated channels and pumps in microbes. 260:
Advances in vision restoration with photochromic compounds has been investigated. Fast isomerization allows retinal cells to turn on when activated by light and advances in acrylamide-azobenzene-quaternary
1559: 475:. The first incorporates the phototunability of various functional groups so reactivity can be modulated in one of the isomeric forms, while the second strategy incorporates light-driven valence bond 2551:
Norikane Y, Tamaoki N (July 2004). "Light-driven molecular hinge: a new molecular machine showing a light-intensity-dependent photoresponse that utilizes the trans-cis isomerization of azobenzene".
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The absorption of a photon converting cis-retinal to trans-retinal. Once converted, the trans-retinal can disassociate from Opsin. Once converted back to the cis- isomer, it can reform Rhodopsin.
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Photoswitches have been used in the generation of three-dimensional animations and images. The display utilizes a medium composed of a class of photoswitches (known as spirhodamines) and
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technology to generate structured light in three dimensions. UV light and green light patterns are aimed at the dye solution, which initiates photoactivation and thus creates the 'on'
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Navrátil R, Wiedbrauk S, Jašík J, Dube H, Roithová J (March 2018). "Transforming hemithioindigo from a two-way to a one-way molecular photoswitch by isolation in the gas phase".
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Jia C, Migliore A, Xin N, Huang S, Wang J, Yang Q, et al. (June 2016). "Covalently bonded single-molecule junctions with stable and reversible photoswitched conductivity".
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storage with better performance. Novel azo-carrying photoswitches are introduced as molecular hinges, which can be used in the design of molecular machines and optical devices.
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for regulating catalytic activity due to its isomerization from the E to Z conformation with light, and its ability to thermally relax back to the E isomer in dark conditions.
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One of the more prevalent biological examples in the human body that undergoes structural changes upon light irradiation includes the class of membrane-bound photoreceptors,
387:, and better energy storage. By changing the chemical properties of the pores, adsorption and desorption of gases can be tuned for advancements in smart membrane materials. 333:
is connected to a circuit that measures how much electricity the cell generates. The circuit decides and gives the output, according to the setting of minimum and maximum
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about double bonds in the molecule can lead to changes in the cis- or trans- configuration. These photochromic molecules are being considered for a range of applications.
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at targeted locations with light has been demonstrated due to the unique change in properties and size of microencapsulated nanostructures with photochromic components.
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Photoswitches are studied in biology, materials chemistry, and physics and have a wide variety of potential applications, especially in the framework of nanotechnology.
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upon irradiation with light. When UV and visible light were irradiated upon opposites sides of the membrane, a storage potential and pH gradient were generated.
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A photochromic compound can change its configuration or structure upon irradiation with light. Several examples of photochromic compounds include:
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conformational isomerization at the adjacent single bond. However, the interconversion of stereoisomers of stilbene proceeds via one-bond-flip.
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has been used to form nanoparticles which can selectively expose enzymes in response to light, allowing them to mimic some functions of cells.
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of DNA and RNA, regulation of enzymatic activity, and photoregulated ion channels. For example, optical control of ligand binding in human
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Upon isomerization from the absorption of light, a π-to-π or n-to-π electronic transition can occur with the subsequent release of light (
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Moran MJ, Magrini M, Walba DM, Aprahamian I (October 2018). "Driving a Liquid Crystal Phase Transition Using a Photochromic Hydrazone".
2758: 458:, photoswitches are being investigated as a means to control activity. By including a photoswitch in a drug, the drug assumes several 2586:
Kazem-Rostami M (5 December 2016). "Design and Synthesis of Ʌ-Shaped Photoswitchable Compounds Employing Tröger's Base Scaffold".
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Pu SZ, Sun Q, Fan CB, Wang RJ, Liu G (2016-04-14). "Recent advances in diarylethene-based multi-responsive molecular switches".
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which measures the effectiveness of absorbed light to induce photoisomerization. Quantum yield is modeled and calculated using
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has been demonstrated to influence its allosteric binding properties. Also, red-shifted azobenzenes have been used to control
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the wavelengths of absorption needed to cause isomerizaiton leads to low light induced switching which has applications in
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compounds are the necessary building blocks for light driven molecular motors and machines. Upon irradiation with light,
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Qian H, Pramanik S, Aprahamian I (July 2017). "Photochromic Hydrazone Switches with Extremely Long Thermal Half-Lives".
376: 58:: Upon irradiation with light, photoisomerization occurs changing the spatial geometry and properties of the molecule. 2309:"Photoswitchable gating of non-equilibrium enzymatic feedback in chemically communicating polymersome nanoreactors" 1927:"A red-shifted, fast-relaxing azobenzene photoswitch for visible light control of an ionotropic glutamate receptor" 1651:
Inuzuka K, Becker RS (July 1968). "Mechanism of photoisomerization in the retinals and implications in rhodopsin".
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Abourashed EA (2017-02-24). "Review of Stilbenes: Applications in Chemistry, Life Sciences and Materials Science".
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Cameron D, Eisler S (2018). "Photoswitchable double bonds: Synthetic strategies for tunability and versatility".
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Liu RS (July 2001). "Photoisomerization by hula-twist: a fundamental supramolecular photochemical reaction".
1148:"Design and Synthesis of Donor–Acceptor Stenhouse Adducts: A Visible Light Photoswitch Derived from Furfural" 3059: 2904: 2130: 277: 23:
is a type of molecule that can change its structural geometry and chemical properties upon irradiation with
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Berkovic G, Krongauz V, Weiss V (May 2000). "Spiropyrans and Spirooxazines for Memories and Switches".
2650: 1520:"Azobenzene-Integrated NHC Ligands: A Versatile Platform for Visible-Light-Switchable Metal Catalysis" 2839: 2524:
Kazem-Rostami M, Moghanian A (2017). "Hünlich base derivatives as photo-responsive Λ-shaped hinges".
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Polosukhina A, Litt J, Tochitsky I, Nemargut J, Sychev Y, De Kouchkovsky I, et al. (July 2012).
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have shown restoration of visual responses in blind mice. Companies involved in this area include
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Bandara HM, Burdette SC (March 2012). "Photoisomerization in different classes of azobenzene".
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Incorporation of photoswitching molecules such as donor-acceptor Stenhouse adducts into
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levels in its open and closed geometrical conformation, into a film composed of either
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that can uptake of gaseous molecules like carbon dioxide as well as contribute to
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Szymański W, Beierle JM, Kistemaker HA, Velema WA, Feringa BL (August 2013).
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Depending on the isomeric state, photoswitches have the potential to replace
3014: 2100: 412: 245: 231: 117:) or heat when electrons transit from an excited state to a ground state. A 90: 2726: 2659: 2599: 2572: 2480: 2472: 2436: 2401: 2352: 2292: 2283: 2258: 2222: 2195: 2154:"A volumetric three-dimensional digital light photoactivatable dye display" 2108: 2065: 2056: 2031: 1960: 1911: 1862: 1821: 1786: 1737: 1619: 1545: 1504: 1463: 1455: 1395: 1335: 1316: 1276: 1179: 1132: 1093: 1044: 1001: 952: 911: 876: 806: 765: 724: 689: 654: 645: 620: 570: 531: 438:. Through irradiation of light, writing, erasing, and reading can parallel 1680: 2824: 2428: 2383: 1536: 1519: 681: 476: 268: 264: 190: 2177: 146:
The three rates completely describe the isomerization from A to B where
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structures can be achieved through photoisomerization of bistable
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One of the most important properties of a photoswitch is its
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upon a change in its shape whereas a machine does. However,
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photoswitches have been promising for use in rewritable
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Incorporation of photoswitchable molecules into porous
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3075–3093. 750:(12): 3406–3424. 676:(27): 9140–9143. 460:biological active 456:photopharmacology 450:Photopharmacology 244:, the release of 195:photopharmacology 29:molecular machine 3107: 3082: 2910:Magnetic starter 2900:Lightning switch 2850:Half-moon switch 2820:Crossover switch 2790:Battery isolator 2761: 2754: 2747: 2738: 2731: 2730: 2720: 2702: 2687:Chemical Science 2678: 2672: 2671: 2653: 2627: 2618: 2612: 2611: 2594:(6): 1214–1222. 2583: 2577: 2576: 2548: 2542: 2541: 2521: 2515: 2514: 2508: 2499: 2493: 2492: 2455: 2449: 2448: 2412: 2406: 2405: 2395: 2378:(3): 1196–1200. 2363: 2357: 2356: 2346: 2328: 2313:Nature Chemistry 2303: 2297: 2296: 2286: 2269:(20): e1905966. 2254: 2243: 2242: 2206: 2200: 2199: 2189: 2149: 2143: 2142: 2127: 2121: 2120: 2087:(6292): 1443–5. 2076: 2070: 2069: 2059: 2042:(20): e1905966. 2027: 2018: 2017: 2006: 2000: 1999: 1971: 1965: 1964: 1954: 1922: 1916: 1915: 1905: 1888:(7): 2215–2224. 1873: 1867: 1866: 1856: 1841:Chemical Reviews 1832: 1826: 1825: 1797: 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3090: 3089: 3088: 3083: 3074: 3050:Transfer switch 3030:Strowger switch 3025:Stepping switch 3020:Staircase timer 2975:Railroad switch 2935:Nintendo Switch 2915:Magnetic switch 2890:Latching switch 2865:Inertial switch 2860:Infinite switch 2815:Crossbar switch 2780:Analogue switch 2771: 2765: 2735: 2734: 2680: 2679: 2675: 2625: 2620: 2619: 2615: 2585: 2584: 2580: 2553:Organic Letters 2550: 2549: 2545: 2523: 2522: 2518: 2506: 2501: 2500: 2496: 2457: 2456: 2452: 2414: 2413: 2409: 2365: 2364: 2360: 2305: 2304: 2300: 2256: 2255: 2246: 2208: 2207: 2203: 2151: 2150: 2146: 2131:Woodford, Chris 2129: 2128: 2124: 2078: 2077: 2073: 2029: 2028: 2021: 2008: 2007: 2003: 1973: 1972: 1968: 1937:(47): 17683–6. 1924: 1923: 1919: 1875: 1874: 1870: 1834: 1833: 1829: 1799: 1798: 1794: 1750: 1749: 1745: 1701: 1700: 1696: 1659:(5152): 383–5. 1650: 1649: 1645: 1632: 1631: 1627: 1583: 1582: 1578: 1569: 1567: 1558: 1557: 1553: 1517: 1516: 1512: 1476: 1475: 1471: 1441: 1440: 1436: 1408: 1407: 1403: 1351: 1350: 1343: 1302:(21): 11153–8. 1289: 1288: 1284: 1254: 1253: 1249: 1242: 1227: 1226: 1222: 1192: 1191: 1187: 1145: 1144: 1140: 1106: 1105: 1101: 1057: 1056: 1052: 1014: 1013: 1009: 965: 964: 960: 924: 923: 919: 889: 888: 884: 854: 853: 849: 819: 818: 814: 778: 777: 773: 737: 736: 732: 702: 701: 697: 667: 666: 662: 618: 617: 613: 583: 582: 578: 544: 543: 539: 495: 494: 490: 485: 477:tautomerization 469: 452: 436:optical storage 429: 427:Optical storage 405: 403:Liquid crystals 393: 381:optoelectronics 373: 354: 306: 298: 258: 228: 212: 203: 171: 151: 137: 128: 115:phosphorescence 107: 49: 17: 12: 11: 5: 3113: 3111: 3103: 3102: 3092: 3091: 3085: 3084: 3077: 3075: 3073: 3072: 3067: 3062: 3057: 3052: 3047: 3042: 3037: 3032: 3027: 3022: 3017: 3012: 3007: 3002: 2997: 2992: 2987: 2982: 2977: 2972: 2967: 2962: 2957: 2955:Placebo button 2952: 2947: 2942: 2940:Optical switch 2937: 2932: 2927: 2922: 2920:Mercury switch 2917: 2912: 2907: 2902: 2897: 2892: 2887: 2882: 2877: 2872: 2867: 2862: 2857: 2852: 2847: 2842: 2837: 2832: 2827: 2822: 2817: 2812: 2807: 2805:Company switch 2802: 2797: 2792: 2787: 2782: 2776: 2773: 2772: 2766: 2764: 2763: 2756: 2749: 2741: 2733: 2732: 2673: 2636:(6): 2178–91. 2613: 2578: 2559:(15): 2595–8. 2543: 2532:(2): 224–228. 2516: 2494: 2450: 2407: 2358: 2319:(1): 110–118. 2298: 2244: 2217:(6): 268–283. 2201: 2144: 2122: 2071: 2019: 2001: 1966: 1917: 1868: 1847:(8): 6114–78. 1827: 1808:(2): 126–127. 1792: 1743: 1714:(2): 355–361. 1694: 1643: 1625: 1576: 1551: 1510: 1469: 1450:(20): 4787–8. 1434: 1401: 1341: 1282: 1247: 1240: 1220: 1185: 1138: 1099: 1050: 1007: 958: 937:(6): 1963–81. 917: 882: 847: 812: 771: 730: 711:(5): 1809–25. 695: 660: 611: 576: 537: 508:(3): 347–358. 487: 486: 484: 481: 468: 465: 451: 448: 428: 425: 409:liquid crystal 404: 401: 392: 389: 372: 369: 353: 352:Energy storage 350: 305: 302: 297: 294: 257: 254: 227: 224: 211: 208: 202: 199: 169: 149: 136: 133: 127: 124: 106: 103: 48: 45: 15: 13: 10: 9: 6: 4: 3: 2: 3112: 3101: 3098: 3097: 3095: 3081: 3071: 3068: 3066: 3063: 3061: 3058: 3056: 3055:Vacuum switch 3053: 3051: 3048: 3046: 3043: 3041: 3038: 3036: 3033: 3031: 3028: 3026: 3023: 3021: 3018: 3016: 3013: 3011: 3008: 3006: 3003: 3001: 2998: 2996: 2993: 2991: 2988: 2986: 2985:Rotary switch 2983: 2981: 2978: 2976: 2973: 2971: 2968: 2966: 2963: 2961: 2958: 2956: 2953: 2951: 2948: 2946: 2943: 2941: 2938: 2936: 2933: 2931: 2928: 2926: 2923: 2921: 2918: 2916: 2913: 2911: 2908: 2906: 2903: 2901: 2898: 2896: 2893: 2891: 2888: 2886: 2883: 2881: 2878: 2876: 2873: 2871: 2868: 2866: 2863: 2861: 2858: 2856: 2853: 2851: 2848: 2846: 2843: 2841: 2838: 2836: 2833: 2831: 2828: 2826: 2823: 2821: 2818: 2816: 2813: 2811: 2808: 2806: 2803: 2801: 2798: 2796: 2793: 2791: 2788: 2786: 2785:Banyan switch 2783: 2781: 2778: 2777: 2774: 2769: 2762: 2757: 2755: 2750: 2748: 2743: 2742: 2739: 2728: 2724: 2719: 2714: 2710: 2706: 2701: 2696: 2692: 2688: 2684: 2677: 2674: 2669: 2665: 2661: 2657: 2652: 2647: 2643: 2639: 2635: 2631: 2624: 2617: 2614: 2609: 2605: 2601: 2597: 2593: 2589: 2582: 2579: 2574: 2570: 2566: 2562: 2558: 2554: 2547: 2544: 2539: 2535: 2531: 2527: 2520: 2517: 2512: 2505: 2498: 2495: 2490: 2486: 2482: 2478: 2474: 2470: 2466: 2462: 2454: 2451: 2446: 2442: 2438: 2434: 2430: 2426: 2422: 2418: 2411: 2408: 2403: 2399: 2394: 2389: 2385: 2381: 2377: 2373: 2369: 2362: 2359: 2354: 2350: 2345: 2340: 2336: 2332: 2327: 2322: 2318: 2314: 2310: 2302: 2299: 2294: 2290: 2285: 2280: 2276: 2272: 2268: 2264: 2260: 2253: 2251: 2249: 2245: 2240: 2236: 2232: 2228: 2224: 2220: 2216: 2212: 2211:ChemPhotoChem 2205: 2202: 2197: 2193: 2188: 2183: 2179: 2175: 2171: 2167: 2163: 2159: 2155: 2148: 2145: 2140: 2136: 2132: 2126: 2123: 2118: 2114: 2110: 2106: 2102: 2098: 2094: 2090: 2086: 2082: 2075: 2072: 2067: 2063: 2058: 2053: 2049: 2045: 2041: 2037: 2033: 2026: 2024: 2020: 2015: 2011: 2005: 2002: 1997: 1993: 1989: 1985: 1981: 1977: 1970: 1967: 1962: 1958: 1953: 1948: 1944: 1940: 1936: 1932: 1928: 1921: 1918: 1913: 1909: 1904: 1899: 1895: 1891: 1887: 1883: 1879: 1872: 1869: 1864: 1860: 1855: 1850: 1846: 1842: 1838: 1831: 1828: 1823: 1819: 1815: 1811: 1807: 1803: 1796: 1793: 1788: 1784: 1779: 1774: 1770: 1766: 1763:(2): 271–82. 1762: 1758: 1754: 1747: 1744: 1739: 1735: 1730: 1725: 1721: 1717: 1713: 1709: 1705: 1698: 1695: 1690: 1686: 1682: 1678: 1674: 1670: 1666: 1662: 1658: 1654: 1647: 1644: 1639: 1635: 1629: 1626: 1621: 1617: 1612: 1607: 1603: 1599: 1596:(1): 126–63. 1595: 1591: 1587: 1580: 1577: 1565: 1561: 1555: 1552: 1547: 1543: 1538: 1533: 1529: 1525: 1521: 1514: 1511: 1506: 1502: 1497: 1492: 1488: 1484: 1480: 1473: 1470: 1465: 1461: 1457: 1453: 1449: 1445: 1438: 1435: 1429: 1424: 1420: 1416: 1412: 1405: 1402: 1397: 1393: 1388: 1383: 1379: 1375: 1371: 1367: 1363: 1359: 1355: 1348: 1346: 1342: 1337: 1333: 1328: 1323: 1318: 1313: 1309: 1305: 1301: 1297: 1293: 1286: 1283: 1278: 1274: 1270: 1266: 1263:(7): 555–62. 1262: 1258: 1251: 1248: 1243: 1237: 1233: 1232: 1224: 1221: 1216: 1212: 1208: 1204: 1200: 1196: 1189: 1186: 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304:Electronics 282:translation 236:melanocytes 83:merocyanine 21:photoswitch 3035:Thermostat 3010:Softswitch 2995:Sea switch 2875:Key switch 2855:Humidistat 2830:DIP switch 2795:Cam switch 1570:2021-02-24 1421:: 100058. 1201:(2): 577. 483:References 413:hydrazones 267:, Vedere, 232:Rhodopsins 226:Rhodopsins 210:Biological 95:thioindigo 79:spiropyran 75:azobenzene 3015:Spark gap 2709:2041-6539 2668:197196311 2588:Synthesis 2489:227174963 2445:207195468 2335:1755-4349 2239:155439646 2231:2367-0932 2164:: 15239. 2117:206649097 1996:0020-1693 1215:0163-3864 1172:0022-3263 842:2050-7534 606:1099-1395 246:melatonin 201:Catalysis 186:Arrhenius 126:Mechanism 91:hydrazone 3100:Switches 3094:Category 2825:Cryotron 2727:34122804 2660:24456115 2608:99913657 2573:15255699 2481:33237715 2437:30293432 2402:30624915 2353:36344820 2293:31975456 2196:28695887 2109:27313042 2066:31975456 1961:24171511 1912:29975051 1863:23614556 1822:33564161 1787:22841312 1738:32065378 1620:24364740 1546:38709955 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2182:PMC 2174:doi 2097:doi 2085:352 2052:doi 1984:doi 1980:470 1947:PMC 1939:doi 1935:135 1898:PMC 1890:doi 1849:doi 1845:113 1810:doi 1773:PMC 1765:doi 1724:PMC 1716:doi 1669:doi 1657:219 1606:PMC 1598:doi 1594:114 1532:doi 1528:146 1491:doi 1452:doi 1423:doi 1382:PMC 1374:doi 1322:PMC 1312:doi 1265:doi 1203:doi 1160:doi 1121:doi 1080:PMC 1072:doi 1033:doi 988:PMC 980:doi 939:doi 900:doi 896:100 865:doi 861:100 830:doi 793:doi 752:doi 713:doi 678:doi 674:139 641:doi 594:doi 559:doi 518:PMC 510:doi 444:DVD 335:lux 325:or 113:or 3096:: 2721:. 2711:. 2703:. 2691:11 2689:. 2685:. 2662:. 2654:. 2644:. 2632:. 2628:. 2602:. 2592:49 2590:. 2567:. 2555:. 2528:. 2509:. 2483:. 2475:. 2465:12 2463:. 2439:. 2431:. 2419:. 2396:. 2386:. 2374:. 2370:. 2347:. 2337:. 2329:. 2317:15 2315:. 2311:. 2287:. 2277:. 2267:32 2265:. 2261:. 2247:^ 2233:. 2225:. 2213:. 2190:. 2180:. 2172:. 2160:. 2156:. 2137:. 2111:. 2103:. 2095:. 2083:. 2060:. 2050:. 2040:32 2038:. 2034:. 2022:^ 2012:. 1990:. 1978:. 1955:. 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Index

electromagnetic radiation
molecular machine
work
photochromic
photoisomerization


azobenzene
spiropyran
merocyanine
diarylethene
hydrazone
thioindigo
stilbene
fluorescence
phosphorescence
photostationary state

quantum yield
Arrhenius
red shifting
photopharmacology

Rhodopsins
melanocytes
vision
melatonin
circadian rhythm
Novartis
Allergan

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