Photomerocyanine
WebThree spiro[indoline-naphthoxazines] and a spiro[indoline-phenanthroxazine], which exhibit photochromic and thermochromic properties, have been investigated. Solvent and … WebPrimary photo-events in a metastable photomerocyanine of spirooxazines. Michele Garbugli. 2011, Optical Materials Express. Read Now Download. Read Now Download. Related Papers.
Photomerocyanine
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WebJun 1, 2000 · Request PDF Merocyanine and Photomerocyanine Dyes We give a review of results from work on merocyanines (MC) and photomerocyanines (PMC) reporting the … WebBoth are activated processes leading back to the ring-closed form; the activation energy is typically 70 kJ mol -1. The activation parameters are used as a basis to examine the …
WebProtonated photomerocyanine (PMCH), which is a ring-opening isomer of spirobenzopyran, functions as a metastable-state photoacid (PAH) driven by blue or visible light. … Webmerocyanine: [noun] any of a class of polymethine dyes that are used like the cyanine dyes as sensitizers in photography but differ from the cyanine dyes in containing an acidic …
WebDec 7, 2024 · Protonated photomerocyanine (PMCH), which is a ring-opening isomer of spirobenzopyran, functions as a metastable-state photoacid (PAH) driven by blue or visible light. Enhancement of the proton photodissociation efficiency and thermal stability of the deprotonated isomer facilitates pH adjustments and control by light irradiation. WebJun 11, 2024 · The photomerocyanine molecule return back to the colorless ring-closed spirooxazine molecular state as the oxazine-bridge is re-formed as displayed in Fig. 3. Spirooxazine derivatives typically offer red, blue and violet through to turquoise colors upon ultraviolet irradiation [ 46 , 47 ].
WebSep 20, 2011 · The mechanism for negative photochromism of spiropyran in silica was investigated. Prior to our study, the chemical origin of the high thermal stability of the photomerocyanine form (PMC-form) dispersed in perhydropolysilazane (PHPS), which is converted to silica at ambient temperature, had been investigated.
WebInfobox references. Merocyanines are a class of polymethine dyes which are clearly defined by set structural properties. Merycyanines belong to the group of dyes referred to as … incendiary explosivesWebThe SYPRO dyes are merocyanine dyes that are essentially non-fluorescent when free in solution, but become intensely fluorescent in hydrophobic environments (Steinberg et al., … in1608 ipcpWebSP transforms into zwitter ionic merocyanine (MC) by UV irradiation (Scheme 9.2A), showing photochromism from colorless to blue.The MC form returns to the closed SP form by … in140dhmse4 hot water heaterWebMay 7, 2014 · The presence of low concentrations of acid favours the pyran ring-opening to afford the (E)-photomerocyanine. The foregoing features have implications for the study of the fading kinetics and applications of photochromic compounds in commercial ophthalmic systems. We thank the EPSRC for access to the National Mass Spectrometry Service, … incendiary flow mtgWebJan 1, 2024 · The photoreaction of PAH-4-OMe in PHEM was monitored by UV–vis spectroscopy during irradiation. The polymer film on a glass substrate was kept in a tilted … incendiary flowWebMar 24, 2024 · The “open form” isomer is named photomerocyanine because its transoid structure is quite similar to that of merocyanine dyes (see Scheme 1 below). Fig. 1 a Absorption spectra of 0.0125 wt% SPy dissolved in PETA before (blue line) and after 30 s UV irradiation (orange line). The absorption spectra between these two curves corresponds … incendiary flare dangerousWebFeb 28, 2024 · A novel, straightforward, and universal strategy to achieve solid materials with highly tunable reverse photochromism by means of commercially available spiropyran dyes, an approach that can be generalized to other spiro dyes with distinct acid-base properties. Herein, we report a novel, straightforward, and universal strategy to achieve … in1900s/ix