Photochromism and Thermochromism of Schiff Bases in the Solid State: Structural Aspects

Hadjoudis, E.; Mavridis, Irene M.

doi:10.1002/chin.200514277

Cited by 31 publications

(44 citation statements)

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“…Photochromism is a result of light-induced reversible color transition of organic, inorganic, biological, and polymeric materials. [57][58][59][60][61][62][63][64][65][66][67][68][69][70] Photochromic reactions are mainly based on cis-trans isomerization, electrocyclization, redox, and light-induced proton transfer mechanisms. The change in the molecular structure before and after light irradiation causes a remarkable variation in the absorption or photoluminescence (PL) spectra.…”

Section: Photochromic Materials For Green Printingmentioning

confidence: 99%

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Stimuli‐responsive photofunctional materials for green and security printing

et al. 2020

InfoMat

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Information recording on paper has always been the most important approach to keep records of human activity and to spread civilization. With the progress of science and technology, paper with different functions should be exploited to conform to the increasing demands in various scenarios. In one aspect, traditional paper can only be used once, and using large amounts of paper causes deforestation, additional solid waste treatment, environmental pollution, and high energy consumption. Consequently, the development of rewritable paper that is environment-friendly, low cost, and can save resources is significant for green printing. In the other aspect, information leakage brings security issues, which may lead to severe consequences, such as war outbreak, economic loss, social problems, and so on. Therefore, the development of security printing has also attracted wide interests. Stimuli-responsive photofunctional materials that have reversible variations in absorption or emission in response to changes in the external environmental have a great potential for the achievement of green and security printing. To date, much progress has been made in these research areas. This paper lists different smart materials that respond to various external stimuli, such as light, water, pH, heat, and metal ions, and summarizes the recent advances towards green and security printing. Also, we discuss the current challenges and future directions in this rapidly growing research field. It is expected that this review article will stimulate and guide future studies for the advanced green and security printing.

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Section: Photochromic Materials For Green Printingmentioning

confidence: 99%

“…Photochromism is a result of light‐induced reversible color transition of organic, inorganic, biological, and polymeric materials 57‐70 . Photochromic reactions are mainly based on cis ‐ trans isomerization, electrocyclization, redox, and light‐induced proton transfer mechanisms.…”

Section: Photochromic Materials For Green and Security Printingmentioning

confidence: 99%

Stimuli‐responsive photofunctional materials for green and security printing

et al. 2020

InfoMat

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“…The molecules without intramolecular hydrogen bond, open forms, exhibit much higher energy than the hydrogen-bonded tautomers. The trans-keto form proposed by Cohen and Schmidt et al (33) to explain the photochromic processes in anils is also discarded; the first excited state of the trans-keto structure exhibits an n, p* nature (which yields a forbidden electronic transition) and the corresponding energy is much higher than that of the excited states for the OH and NH tautomers.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

Steady‐State Spectroscopy of the 2‐(N‐methylacetimidoyl)‐1‐naphthol Molecule

Valle

Díaz-Oliva

2015

Photochem & Photobiology

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The steady-state spectroscopy of 2-(N-methylacetimidoyl)-1-naphthol (MAN) reveals composite absorption and emission spectra from 298 to 193 K in hexane. The ground electronic state (So) absorption can be assigned to the sum of three molecular structures: the OH normal tautomer, and two NH proton transfer tautomers. The NH-structures are the most stable ones in equilibrium with the OH tautomer for the S0 state. On photoexcitation of the OH tautomer the excited state intramolecular proton transfer is undergone, and the corresponding NH emission is monitored at 470 nm. On photoexcitation of the NH tautomers the previous emission is monitored in addition to another emission at 600 nm, which is ascribed to intramolecular hydrogen-bonded (IHB) nonplanar NH structures generated from the IHB planar NH tautomers. A Jabłoński diagram is introduced which gathers all the experimental evidence as well as the theoretical calculations executed at the DFT-B3LYP and TD-DFT levels. The MAN molecule is compared with other analogs such as 1-hydroxy-2-acetonaphthone (HAN), 2-(1'-hydroxy-2'-naphthyl)benzimidazole and methyl 1-hydroxy-2-naphthoate to validate the theoretical calculations. Photoexcitation of MAN generates two emission bands at longer wavelengths than that of the emission band of HAN. The MAN molecule exhibits a great photostability in hydrocarbon solution which depends on the photophysics of the NH tautomers (keto forms).

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“…Photochromic (PC) materials have drawn much attention due to their potential applications in 3D information storage, optical switches, and optical anti-fake labels. [1][2][3][4][5][6] PC reaction can be reversibly transformed by alternating visible light or thermal stimulation and light stimulus. [7][8][9] Additionally, PC materials doped with luminescence activators possess both PC and emission modulation behaviors in one single material.…”

Section: Introductionmentioning

confidence: 99%

“…Photochromic (PC) materials have drawn much attention due to their potential applications in 3D information storage, optical switches, and optical anti‐fake labels . PC reaction can be reversibly transformed by alternating visible light or thermal stimulation and light stimulus .…”

Section: Introductionmentioning

confidence: 99%

The upconversion luminescence modulation and its enhancement in Er³⁺‐doped Na_0.5Bi_0.5TiO₃ based on photochromic reaction

Luo

Zhang

et al. 2018

J Am Ceram Soc

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A large and reversible upconversion (UC) luminescence modulation has been found in the Na0.498Bi0.498TiO3:0.002Er (NBT:0.002Er) based on the photochromic reaction. The dependence of luminescence modulation of the ceramics on the wavelength of irradiation light and sintering temperature was investigated. It was found that the optimized sintering temperature and irradiation wavelength were 1130°C and 405 nm, respectively. The highest ΔRt (defined as: ΔRt = (R0 – Rt)/R0×100(%), where R0 and Rt are the initial emission intensity and that after different irradiation time, respectively) value of 44.9% was obtained for the ceramics sintered at 1130°C after irradiation at 405 nm. More importantly, for the poled ceramics, ΔRt value was promoted to a high value of 75.5%, which was 168% of that of the unpoled ones. The mechanism of luminescence modulation and its enhancement via electric field poling were discussed. This study demonstrated that electric field poling was an effective strategy to enhance the PC reaction in the NBT ceramics.

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Photochromism and Thermochromism of Schiff Bases in the Solid State: Structural Aspects

Abstract: 2005 Physical chemistry Z 0225 Photochromism and Thermochromism of Schiff Bases in the Solid State: Structural Aspects -[35 refs.]. -(HADJOUDIS, E.; MAVRIDIS, I. M.; Chem. Soc.

Cited by 31 publications

References 1 publication

Stimuli‐responsive photofunctional materials for green and security printing

Stimuli‐responsive photofunctional materials for green and security printing

Steady‐State Spectroscopy of the 2‐(N‐methylacetimidoyl)‐1‐naphthol Molecule

The upconversion luminescence modulation and its enhancement in Er³⁺‐doped Na_0.5Bi_0.5TiO₃ based on photochromic reaction

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Photochromism and Thermochromism of Schiff Bases in the Solid State: Structural Aspects

Abstract: 2005 Physical chemistry Z 0225 Photochromism and Thermochromism of Schiff Bases in the Solid State: Structural Aspects -[35 refs.]. -(HADJOUDIS, E.; MAVRIDIS, I. M.; Chem. Soc.

Cited by 31 publications

References 1 publication

Stimuli‐responsive photofunctional materials for green and security printing

Stimuli‐responsive photofunctional materials for green and security printing

Steady‐State Spectroscopy of the 2‐(N‐methylacetimidoyl)‐1‐naphthol Molecule

The upconversion luminescence modulation and its enhancement in Er3+‐doped Na0.5Bi0.5TiO3 based on photochromic reaction

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The upconversion luminescence modulation and its enhancement in Er³⁺‐doped Na_0.5Bi_0.5TiO₃ based on photochromic reaction