The Halochromism of Ketones. II<sup>1</sup>

Anderson, Leigh C.; Gooding, Chester M.

doi:10.1021/ja01309a010

Cited by 6 publications

(5 citation statements)

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“…While we may conclude t h a t the spectra obtained in the present instance are substantially those of the ketones themselves and not of condensation products, the reverse has been true for the spectra previously reported for aliphatic lietones in concentrated acid solution (13).…”

Section: Extent Of Condensation Reactions In Strong Acid Solutionsupporting

confidence: 40%

Ionization of Organic Compounds in Acid I. Aliphatic Ketones

Campbell¹,

Edward²

1960

Can. J. Chem.

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Section: Extent Of Condensation Reactions In Strong Acid Solutionsupporting

confidence: 40%

Ionization of Organic Compounds in Acid I. Aliphatic Ketones

Campbell¹,

Edward²

1960

Can. J. Chem.

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“…Many photoinitiators are, to some degree, solvatochromic or halochromic, i.e., their absorption band shifts with the solvent polarity or the pH value of the surrounding medium. − Moreover, Norrish type II photoinitiators show a reduced reactivity in acidic aqueous photoresins . Such a pH sensitivity can be exploited to obtain a superlinear behavior by incorporating photoacidic or photobasic molecules into a (water-based) photoresin.…”

Section: Alternative Nonlinear Absorption Processesmentioning

confidence: 99%

Challenges and Opportunities in 3D Laser Printing Based on (1 + 1)-Photon Absorption

et al. 2022

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Most light-based 3D printing methods rely on optical or chemical nonlinearities to spatially confine the polymerization reaction. In 3D micro-and nanoprinting, this nonlinearity can be provided by two-photon absorption, which describes the simultaneous absorption of two photons. To achieve comparable absorption cross sections for two-photon as in onephoton absorption, short and intense laser pulses with intensities in the range of 1 TW/cm 2 are typically required. Herein, we review three emerging excitation processes that provide a quadratic nonlinearity versus intensity without relying on two-photon absorption: upconversion luminescence, two-step absorption, and triplet−triplet annihilation. We term these "(1 + 1)-photon absorption". Such processes allow for using continuous-wave lasers at much lower peak laser powers and at much lower cost than those typical for two-photon absorption. We review recent progress, describe current challenges, and outline future perspectives.

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“…Hence, the CuMo 0.9 W 0.1 O 4 oxide exhibits halochromic-like properties. Even if in literature, numerous organic dyes exhibit halochromic behavior (color controlled via solution pH), − such a property has never been reported before for inorganic oxides. Kinetic behavior of the protonation reaction was also characterized and interpreted.…”

Section: Introductionmentioning

confidence: 96%

Investigation of the Chromic Phase Transition of CuMo_0.9W_0.1O₄ Induced by Surface Protonation

et al. 2010

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CuMo0 .9 W 0.1 O 4 oxide is known to exhibit two allotropic forms (R and γ forms) linked by a firstorder phase transition that can be induced by pressure and/or temperature. In this work, we show that this R f γ phase transition (with a chromic effect from green to brown color) can also take place at 25°C by a simple immersion of the powder in an aqueous solution with acidic pH. This chromic phase transition from the high-temperature/low pressure form into the low-temperature/highpressure form is shown to be induced by surface protonation, whereas the copper-molybdate powder is dispersed in acidic solutions. Wettability measurements on both phases were performed in order to confirm the affinity of the R-form for protons in comparison with the γ-form. Then pH metric titration (addition step by step of an acid solution on the powder, controlling at each step the pH evolution) has allowed describing the kinetic aspects of the surface protonation (kinetic laws were approached and discussed). Finally, an interpretative model of the "halochromic" phenomenon based on the modification of the cations environment at the liquid-solid interface was proposed. For the first time, a superficial interaction between a solid oxide and a liquid medium, for which no partial dissolution-recrystallization sequence is occurring, is shown to be sufficient for producing a phase transition of the whole oxide bulk.

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The Halochromism of Ketones. II¹

Cited by 6 publications

References 0 publications

Ionization of Organic Compounds in Acid I. Aliphatic Ketones

Ionization of Organic Compounds in Acid I. Aliphatic Ketones

Challenges and Opportunities in 3D Laser Printing Based on (1 + 1)-Photon Absorption

Investigation of the Chromic Phase Transition of CuMo_0.9W_0.1O₄ Induced by Surface Protonation

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The Halochromism of Ketones. II1

Cited by 6 publications

References 0 publications

Ionization of Organic Compounds in Acid I. Aliphatic Ketones

Ionization of Organic Compounds in Acid I. Aliphatic Ketones

Challenges and Opportunities in 3D Laser Printing Based on (1 + 1)-Photon Absorption

Investigation of the Chromic Phase Transition of CuMo0.9W0.1O4 Induced by Surface Protonation

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The Halochromism of Ketones. II¹

Investigation of the Chromic Phase Transition of CuMo_0.9W_0.1O₄ Induced by Surface Protonation