Introduction: Organic Photochromic Molecules

Nakatani, Keitaro; Piard, Jonathan; Yu, Peng; Métivier, Rémi

doi:10.1002/9783527683734.ch1

Cited by 19 publications

(22 citation statements)

References 215 publications

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“…If the thermal activation barrier between the metastable and the stable isomer is relatively low, a significant amount of thermal back isomerization is observed at ambient conditions, rendering the photoswitch a T-type one. 12,106 In the case of higher thermal activation barriers, the two photoisomers are considered bi-stable and isomerization is practically triggered exclusively using photochemical processes (P-type photoswitch). 12,106,108 …”

Section: Molecular Photoswitchesmentioning

confidence: 99%

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Molecular photoswitches in aqueous environments

et al. 2021

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Section: Molecular Photoswitchesmentioning

confidence: 99%

“… 12,106 In the case of higher thermal activation barriers, the two photoisomers are considered bi-stable and isomerization is practically triggered exclusively using photochemical processes (P-type photoswitch). 12,106,108 …”

Section: Molecular Photoswitchesmentioning

confidence: 99%

Molecular photoswitches in aqueous environments

et al. 2021

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“…The word "photochromism" had become quite usual during 1950s and 1960s. Many new molecules were synthesized and studied during this period (Nakatani, Piard, Yu, & Métivier, 2016;Dessauer & Paris, 1963;Brown & Shaw, 1961;Cohen & Newman, 1967).…”

Section: Literature Reviewmentioning

confidence: 99%

“…There has been a significant interest in photochromism from the community of researchers in fluorescence microscopy imaging in the field of biology, medicine, material science, etc. (Nakatani, Piard, Yu, &Métivier, 2016). Photochromism can be implemented to develop faster microscopes with better resolutions.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary First Principle Study on Photochromism of Diarylethene Molecules

Karki

2019

Prithvi J. Res. Innov.

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Photochromism in some diarylethene molecules have been studied by using hybrid density functional theory using the ground state energy consideration. In particular, B3LYP functional and all electron basis set 6-311G (2d,2p) as implemented in Gaussian09 suites of program has been used to investigate the energy difference of two stable isomers of stilbene, azobenzene, cyclooctane, and 1,2, dimethylcyclohexane molecules. The energy difference is corroborated to calculate the frequencies of photons that are required to induce photochromism in these molecules in vacuum and in solvation state. The study found that the molecules exhibit photochromism at various frequency range from infra-red to ultraviolet. The binding energy per atom, charge distribution, HOMO-LUMO (Highest Occupied Molecular Orbital and Lowest Unoccupied Molecular Orbital) gap are also calculated for all the molecules in vacuum, water and ethanol solvent. The results obtained are in accordance with the experimental observations.

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“…Organic photochromic systems are constituted by two isomeric species. Upon light irradiation, the low-energy isomer converts to the metastable high-energy isomer that can go back to the original isomer either thermally (T-type photoswitch) or photochemically (P-type photoswitch) [1][2][3][4]. Photochromic molecules have attracted increasing interest in recent years as candidates for storing solar energy in closed molecular systems, such as molecular solar thermal (MOST) systems, also termed solar thermal fuels (STF) [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

ortho-Substituted 2-Phenyldihydroazulene Photoswitches: Enhancing the Lifetime of the Photoisomer by ortho-Aryl Interactions

et al. 2021

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Photochromic molecules are systems that undergo a photoisomerization to high-energy isomers and are attractive for the storage of solar energy in a closed-energy cycle, for example, in molecular solar thermal energy storage systems. One challenge is to control the discharge time of the high-energy isomer. Here, we show that different substituents in the ortho position of a phenyl ring at C-2 of dihydroazulene (DHA-Ph) significantly increase the half-life of the metastable vinylheptafulvene (VHF-Ph) photoisomer; thus, the energy-releasing VHF-to-DHA back-reaction rises from minutes to days in comparison to the corresponding para- and meta-substituted systems. Systems with two photochromic DHA-Ph units connected by a diacetylene bridge either at the para, meta and ortho positions and corresponding to a linear or to a cross-conjugated pathway between the two photochromes are also presented. Here, the ortho substitution was found to compromise the switching properties. Thus, irradiation of ortho-bridged DHA-DHA resulted in degradation, probably due to the proximity of the different functional groups that can give rise to side-reactions.

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Introduction: Organic Photochromic Molecules

Cited by 19 publications

References 215 publications

Molecular photoswitches in aqueous environments

Molecular photoswitches in aqueous environments

A Preliminary First Principle Study on Photochromism of Diarylethene Molecules

ortho-Substituted 2-Phenyldihydroazulene Photoswitches: Enhancing the Lifetime of the Photoisomer by ortho-Aryl Interactions

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