Results 111 to 120 of about 370 (160)
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Diaryldistyrylpyrazines: Solvatochromic and Acidochromic Fluorophores
European Journal of Organic Chemistry, 2013AbstractDiaryldimethylpyrazines are the starting materials for the synthesis of C2‐symmetric donor‐ or acceptor‐substituted distyrylpyrazines. The optical properties of these cruciform‐shaped dyes are dominated by the distyrylpyrazine units; the photophysics is controlled by the styryl substitution, the diaryl substituents on the central pyrazine only ...
Volker Schmitt +2 more
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Oxidative cross-coupling of quinoxalinones with indoles enabled by acidochromism
Organic & Biomolecular Chemistry, 2023We report a new gate for changing photo inactive compounds into photocatalysts with easy operation, good tolerance of functional groups, and considerable yield. We demonstrate the synthesis of the natural products Azacephalandole A and Cephalandole A in high yields.
Jie Huang, Long Wang, Xiang-Ying Tang
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Modelling the acidochromism of pyridylazulenes
Chemical Physics Letters, 2008Abstract The structure of six recently synthesised neutral or charged 1-pyridylazulenes and 1,3-dipyridylazulene have been investigated with the PCM–PBE0/6-311++G(2d,2p) approach. Our calculations demonstrate that several conformers of similar energies might coexist in the experimental conditions.
Jacquemin, Denis +2 more
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Photoactuation, photochromism and acidochromism of styrylindazole-based crystalline materials
Dyes and Pigments, 2023Kaiqi Ye, Xiqiao Yang, Jingbo Sun
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Elucidating the Mechanisms of Acidochromic Spiropyran-Merocyanine Interconversion
The Journal of Physical Chemistry A, 2007The thermal and photochemical processes associated with the acid-induced conversions of 6-nitroBIPS, SP-1, to form the protonated merocyanine (MC-OH+) were investigated via UV/vis spectrophotometric studies in acetone. It was found that the mechanism of trifluoroacetic acid (TFA)-induced ring-opening of the SP and the rate of MC-OH+ formation follows a
James T C, Wojtyk +7 more
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Smart Organic Materials with Acidochromic Properties
Current Organic Chemistry, 2020Smart materials displaying changes in color and optical properties in response to acid stimuli are known as acidochromic materials. The recent progress and emerging trends in the field of smart organic materials with acidochromic properties, reported in the last seven years, are presented herein. The molecular design of acidochromic organic materials,
Tanisha Sachdeva +2 more
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Acidochromism of the luminescence of bis(4-pyridylethenyl)arenes
Synthetic Metals, 2004Abstract A series of C 2 -symmetrical bis[( E )-2-(4-pyridyl)ethenyl]arenes has been synthesised via two-fold PO-activated olefinations. 1,4-Benzene, 1,4-naphthalene, 9,10-anthracene and 2,2′-diphenyl were used as central units. These fluorescent compounds were freely soluble in common solvents.
Heiner Detert +2 more
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Acidochromicity of Bisarylethynylbenzenes: Hydroxy versus Dialkylamino Substituents
The Journal of Organic Chemistry, 2009This contribution investigates the electronic difference of dibutylamino/dibutylammonium and phenol/phenolate groups in four simple distyrylbenzenes and bisarylethynylbenzenes. The compounds and their protonated and deprotonated species, respectively, were investigated by UV-vis and emission spectroscopies.
Scott M, Brombosz +3 more
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Light‐ and Humidity‐Induced Motion of an Acidochromic Film
Angewandte Chemie International Edition, 2015AbstractA smart acidochromic agarose‐based film with 1,4‐bis(para‐hydroxystyryl)benzene as the pH‐responsive fluorophore was prepared. This film can simultaneously harness the chemical potential of light and aerial humidity gradients to convert them into mechanical work.
Lidong, Zhang, Panče, Naumov
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Thermochromism and Acidochromism in Substituted Polyanilines
1987Conjugated polymers exhibit interesting properties as materials for rechargeable batteries [1–3]. modified electrodes [4], and electrochromic display devices [5–6]. The last application involves a reversible color change depending on the redox state of the polymer; the green oxidized polyaniline films can be changed to transparent yellow by reduction ...
Snauwaert, Philippe +3 more
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