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   Articles with "intramolecular proton" as a keyword



Excited state intramolecular proton transfer mechanism of a benzothiazole derivative fluorescent probe: Spontaneous ESIPT process

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recommendations! Published in 2021 at "Chemical Physics Letters"

DOI: 10.1016/j.cplett.2021.139055

Abstract: Abstract We have investigated the fluorescent mechanism of 4-(benzo[d]thiazol-2-yl)-2-(1,3-dithian-2-yl) phenol (HBT-Hg) and the excited state intramolecular proton transfer processes (ESIPT) for hydroxyphenyl benzothiazole-based fluorescent probe (HBH) by DFT/TDDFT method. After optimizing the geometries of HBH-Enol… read more here.

Keywords: state; intramolecular proton; excited state; proton transfer ... See more keywords
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Multiple fluorescence of tetraarylimidazole and azomethinocoumarin dyad with dual excited-state intramolecular proton transfer

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recommendations! Published in 2020 at "Dyes and Pigments"

DOI: 10.1016/j.dyepig.2020.108716

Abstract: Abstract Synthesis and structure of novel dyad which molecule includes two fluorophores - 1,2,4,5-tetraarylimidazole and 8-arylazomethino-7-hydroxycoumarin, are described with the aim to obtain compounds with tunable luminescence. The fluorescent excited states of both fluorofores are… read more here.

Keywords: state; state intramolecular; excited state; fluorescence ... See more keywords
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Intramolecular proton transfer from one ether oxygen to another

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recommendations! Published in 2017 at "International Journal of Mass Spectrometry"

DOI: 10.1016/j.ijms.2016.08.012

Abstract: Abstract Proton transfer in the conjugate acid cation of a symmetric diether, 1,5-dimethoxy-3,3-dimethylpentane (1), is explored both theoretically and experimentally via IRMPD spectroscopy. The optimized geometry of the cation has one oxygen pyramidalized (sum of… read more here.

Keywords: oxygen; geometry; proton transfer; intramolecular proton ... See more keywords

Excited state intramolecular proton transfer involving a four-membered system: Photophysical exploration of an isoindole fused imidazole system

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recommendations! Published in 2017 at "Journal of Luminescence"

DOI: 10.1016/j.jlumin.2017.02.064

Abstract: Abstract The spectral behaviour of a pharmaceutically important molecule, 1-(2-Hydroxy-5-bromo-phenyl)-3,5-dioxo-1 H -imidazo-[3,4- b ] isoindole (ADBR), has been reported. The photophysical properties of ADBR reveal the occurrence of excited state intramolecular proton transfer (ESIPT) phenomenon… read more here.

Keywords: state; state intramolecular; excited state; system ... See more keywords
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Theoretical investigation of twisted charge-transfer-promoted intramolecular proton transfer in the excited state of 4′-dimethylaminoflavonol in a highly polar solvent

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recommendations! Published in 2018 at "Journal of Luminescence"

DOI: 10.1016/j.jlumin.2017.09.051

Abstract: Abstract Theoretical insight is provided into excited-state intramolecular proton transfer based on a time-dependent density-functional theory method for 4′-dimethylaminoflavonol in the highly polar solvent acetonitrile. The calculated absorption and fluorescence spectra are in good agreement… read more here.

Keywords: state; excited state; intramolecular proton; charge ... See more keywords
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N-ethyl substituted 2-benzimidazolyl-3-hydroxychromone: Atypical to highly fluorescent dyes of flavonol series excited state intramolecular proton transfer to nitrogen

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recommendations! Published in 2020 at "Journal of Luminescence"

DOI: 10.1016/j.jlumin.2020.117206

Abstract: Abstract New derivative of 3-hydroxychromone possessing N-ethyl substituted benzimidazole moiety was specially synthesized with the aim to switch the excited state intramolecular proton transfer (ESIPT) to heterocyclic nitrogen atom, this ESIPT direction is generally less… read more here.

Keywords: state; intramolecular proton; excited state; proton transfer ... See more keywords
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Speed tunability of the excited-state intramolecular proton transfer process based on seven-membered ring pyrrole-indole H-bond systems

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recommendations! Published in 2019 at "Journal of Molecular Liquids"

DOI: 10.1016/j.molliq.2019.110887

Abstract: Abstract A speed tunable excited-state intramolecular proton transfer (ESIPT) system featuring a seven-membered ring, -NH- type hydrogen bonding pyrrole-indole moiety based on ‘naked’ diazaborepins (NDABs) was exhibited. In this paper, the speed of ESIPT process… read more here.

Keywords: excited state; state; state intramolecular; seven membered ... See more keywords
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Excited state intramolecular proton transfer process in benzazole fluorophores tailored by polymeric matrix: A combined theoretical and experimental study

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recommendations! Published in 2019 at "Journal of Molecular Liquids"

DOI: 10.1016/j.molliq.2019.111710

Abstract: Abstract The effects of the polymeric matrix on the photophysical properties of monomeric dyes reactive to Excited State Intramolecular Proton Transfer (ESIPT) were evaluated by UV–Vis absorption and steady-state and time-resolved emission spectroscopies. A radical… read more here.

Keywords: state; state intramolecular; excited state; polymeric matrix ... See more keywords
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Oxazoline as acceptor moiety for excited-state intramolecular proton transfer

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recommendations! Published in 2018 at "Tetrahedron"

DOI: 10.1016/j.tet.2018.10.019

Abstract: Abstract Excited state intramolecular proton transfer (ESIPT) is a widespread phenomenon that has been exploited in several analytical and technological applications. Here we describe the synthesis of two ESIPT-active halogen-substituted naphthol-oxazolines that can be conveniently… read more here.

Keywords: state intramolecular; excited state; proton transfer; intramolecular proton ... See more keywords
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Aerobic C(sp2)-H Hydroxylations of 2-Aryloxazolines: Fast Access to Excited-State Intramolecular Proton Transfer (ESIPT)-Based Luminophores.

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recommendations! Published in 2019 at "Organic letters"

DOI: 10.1021/acs.orglett.9b01350

Abstract: The direct hydroxylation of 2-aryloxazolines via a deprotonative magnesiation using TMPMgCl·LiCl and subsequent oxidation with molecular oxygen or air as a green oxidant is reported. This method proceeds under mild conditions at room temperature with… read more here.

Keywords: state intramolecular; excited state; proton transfer; intramolecular proton ... See more keywords

Precise Manipulation of Excited-State Intramolecular Proton Transfer via Incorporating Charge Transfer toward High-Performance Film-Based Fluorescence Sensing.

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recommendations! Published in 2023 at "Journal of the American Chemical Society"

DOI: 10.1021/jacs.2c13843

Abstract: Excited-state intramolecular proton transfer (ESIPT) has been widely employed for the design of a variety of functionality-led molecular systems. However, precise manipulation of the excited-state reaction is challenging. Herein, we report a new tactic for… read more here.

Keywords: state; transfer; intramolecular proton; state intramolecular ... See more keywords