Photochromic metal–organic frameworks for inkless and erasable printing

Garai, Bikash; Mallick, Arijit; Banerjee, Rahul

doi:10.1039/c5sc04450b

Cited by 332 publications

(203 citation statements)

References 40 publications

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“…The pattern can then be completely erased through heating the sample above T g , returning the film to the full colored state. 31,32 This efficient pattern transfer is made possible by covalently binding the DASAs to polymers, since it eliminated phase separation and allows for the facile fabrication of uniform films. Furthermore, fine patterns with structural features below 100 μm could be achieved ( Figure S23).…”

Section: Acs Macro Lettersmentioning

confidence: 99%

Visible Light-Responsive DASA-Polymer Conjugates

et al. 2017

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A modular synthesis of Donor−Acceptor Stenhouse Adduct (DASA) polymer conjugates is described. Pentafluorophenyl-ester chemistry is employed to incorporate aromatic amines into acrylate and methacrylate copolymers, which are subsequently coupled with activated furans to generate polymers bearing a range of DASA units in a modular manner. The effect of polymer glass transition temperature on switching kinetics is studied, showing dramatic rate enhancements in going from a glassy to a rubbery matrix. Moreover, tuning the DASA absorption profile allows for selective switching, as demonstrated by ternary photopatterning, with potential applications in rewriteable data storage.

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Section: Acs Macro Lettersmentioning

confidence: 99%

Visible Light-Responsive DASA-Polymer Conjugates

et al. 2017

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“…[176] Bei STM-basierten Analysen ist besonders zu beachten, dass die Polymere eventuell nicht direkt auf dem Substrat liegen. [143] Damit eignen sich diese extrem dünnen, aber lateral makroskopisch ausgedehnten Schichten prinzipiell als optische Datenträger [180][181][182][183] z. Beides ist nur mit großer Sorgfalt mçglich, aber insbesondere unter Verwendung der zweiten Methode ließen sich wichtige Information gewinnen, da so auch durch konformative Optimierung verborgene Netzwerkstrukturen zum Vorschein kommen kçnnten.…”

Section: Ausblickunclassified

Makroskopische kristalline 2D‐Polymere

Feng

Schlüter²

2018

Angewandte Chemie

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Monolagen mit interner Periodizität können als 2D‐Polymere oder “molekulare Fischernetze” beschrieben werden. Solche Strukturen sind in der Vergangenheit durch photochemische Reaktionen in Einkristallen hergestellt worden, die aus Monomeren mit spezifisch entworfenen Strukturen bestehen. Einzelne Schichten wurden später durch Exfolierung isoliert. Diese milden Bedingungen ermöglichen zwar exzellente Kontrolle über die gebildete Struktur, allerdings ist die Ausdehnung der erhaltenen 2D‐Polymere durch die Kristallausdehnung limitiert. Dieser Aufsatz befasst sich mit Ansätzen zur Herstellung von 2D‐Polymeren mit makroskopischen lateralen Abmessungen. Solche Abmessungen sind zugänglich, wenn Polymerisationsreaktionen an Grenzflächen zwischen zwei Flüssigkeiten bzw. zwischen einer Flüssigkeit und einem Gas (besonders der Wasser/Luft‐Grenzfläche) durchgeführt werden. Damit lassen sich zwar prinzipiell 2D‐Polymere makroskopischer Größe erzeugen, allerdings eröffnen sich neue analytische Probleme. Einige dieser Herausforderungen werden besprochen und die vielversprechendsten Lösungsansätze hervorgehoben. Anhand dreier repräsentativer Strukturen demonstriert dieser Aufsatz den gegenwärtigen Stand der Technik im noch jungen Feld der 2D‐Polymeranalytik. Zuletzt werden mögliche Anwendungen für neue organische 2D‐Materialien beschrieben, z. B. als Nanomembranen, organische (opto)elektronische Komponenten oder Katalysatoren für die Wasserspaltung.

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“…Among the external stimuli that can be employed to operate molecular switches, light is a popular choice as it can be precisely controlled in both radiation time and wavelength without introducing additional chemical species in the systems . So far, several photoresponsive molecules, including azobenzene and diarylethene, have been successfully incorporated into MOFs and the properties of resulting materials can be modulated by photoirradiation.…”

Section: Switching Behaviors Of Immobilized Oms In Mofsmentioning

confidence: 99%

“…Besides azobenzene and diarylethene, other photoresponsive molecules have also been immobilized into MOFs . For example, by using a two‐step postsynthetic modification method, D'Alessandro and co‐workers reported a spiropyran‐incorporated MOF, in which the spiropyran units can convert to the colored merocyanine state under UV irradiation.…”

Section: Switching Behaviors Of Immobilized Oms In Mofsmentioning

confidence: 99%

Immobilizing Organic‐Based Molecular Switches into Metal–Organic Frameworks: A Promising Strategy for Switching in Solid State

Gui

Meng

Xie

et al. 2017

Macromol. Rapid Commun.

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These organic-based molecular switches (OMS), [6][7][8][9][10] as their structures and functions can be efficiently tailored by synthetic methods based on centuries of knowledge in organic chemistry, are appealing components for constructing molecular devices, [11][12][13][14] nanoscale electronic circuits, [15][16][17] and various smart materials. [18][19][20][21] For further applications, in particular device fabrication, it is inevitable to incorporate OMS into various solid-state materials. [22][23][24][25] However, presumably because of spatial confinement or inefficient conversion in densely packed solid phase, [26,27] OMS in the solid state, which do not retain identical properties in solution, may partially or even completely lose their switchability and functionality.Immobilizing OMS into metal-organic frameworks (MOFs) ( Figure 1B), a class of organic-inorganic hybrids porous crystalline materials, [28][29][30][31][32][33] could provide a highly appealing route toward switching in solid state. For several reasons this approach is particularly attractive. First, the modularity of the organic components in MOFs paves the way for OMS to be incorporated either in the predesigned organic linkers [34,35] which latter employed as MOF building blocks or by postsynthetic modification approaches after MOF formation. [36] Second, the porosity offers both the essential space for the chemical reactants to access OMS in the MOF pores and appropriate room for OMS to change conformations in the solid-state. [37] Third, the robust nature of MOFs can allow the resulting OMS-based material maintain their crystallinity even upon drastic changes to some of their constituents. [38,39] With proper design strategies, the incorporation of OMS into MOFs not only provides unique opportunities for the solution characteristics of OMS to be smoothly reproduced in the solid state with high fidelity for further applications (e.g., memory device) but also allows the reversible single-crystal-to-singlecrystal transformations, which will enhance our fundamental understanding of the structure-function relationship for the designs and syntheses of novel stimuli-responsive materials.Over the past few years, a lot of efforts have been devoted to the construction of OMS-based MOFs. [40][41][42][43][44][45][46][47] Considering the increasing interest in this topic, we herein highlight the recent progress of stimuli-responsive MOFs with OMS inside as part of their organic components. In the first part, we discuss the switching behaviors of OMS under different stimuli in Stimuli-Responsive MaterialsOrganic-based molecular switches (OMS) are essential components for the ultimate miniaturization of nanoscale electronics and devices. For practical applications, it is often necessary for OMS to be incorporated into functional solid-state materials. However, the switching characteristics of OMS in solution are usually not transferrable to the solid state, presumably because of spatial confinement or inefficient conversion in densely packed solid pha...

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Photochromic metal–organic frameworks for inkless and erasable printing

Cited by 332 publications

References 40 publications

Visible Light-Responsive DASA-Polymer Conjugates

Visible Light-Responsive DASA-Polymer Conjugates

Makroskopische kristalline 2D‐Polymere

Immobilizing Organic‐Based Molecular Switches into Metal–Organic Frameworks: A Promising Strategy for Switching in Solid State

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