A metastable-state photoacid-based metal organic framework with multi-stimuli-responsive chromism

Zhang, Ting; Yang, Zongfan; Wang, Jiaxing; Chen, Long; Li, Chen

doi:10.1016/j.dyepig.2022.110365

Cited by 9 publications

(7 citation statements)

References 41 publications

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“…In the absence of UV rays, the spiropyran structure appears a colorless state, and the merocyanine structure that appears when exposed to UV appears the colored state. 37–42 The colorimetric temperature sensor was initially blue-green but turned white when exposed to temperatures above 35 °C. The colorimetric UV sensor was initially white, but turned purple when exposed to UV over 2 mW cm −2 .…”

Section: Resultsmentioning

confidence: 99%

“…In the absence of UV rays, the spiropyran structure appears a colorless state, and the merocyanine structure that appears when exposed to UV appears the colored state. [37][38][39][40][41][42] The colorimetric temperature sensor was initially blue-green but turned white when exposed to temperatures above 35 C. The colorimetric UV sensor was initially white, but turned purple when exposed to UV over 2 mW cm À2 . The color-change colorimetric temperature and UV sensors were restored to their initial states of blue-green (colorimetric temperature sensor) and white (colorimetric UV sensor) when they are out of the high temperature and UV exposure environments, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Washable and stretchable fiber with heat and ultraviolet color conversion

Yang

2022

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Washable and stretchable fiber with heat and ultraviolet color conversion

Yang

2022

RSC Adv.

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“…This is the governing mechanism behind the self-propulsion of the droplet, i.e., that the protonation of the acceptor situated on the surface of the droplet changes the surface tension and induces self-propulsion. It is worth mentioning that another class of molecules is also being referred to as photoacids, which are based on the photochromic structural change of the molecule, whereas the most known representative of this class is the spiropyran–merocyanine system. − During the photochromic structural change of such molecules, a proton is being released, and hence it is also referred to as a photoacid. However, since the reversible photochromism mechanism is orders of magnitude slower compared to the ESPT process and proton recombination of Brønsted photoacids, the working mechanism of using photochromic photoacids is via the transient acidification of the solution (i.e., a pH change) and not a direct proton transfer between the donor and the acceptor.…”

Section: Resultsmentioning

confidence: 99%

Application of Super Photoacids in Controlling Dynamic Processes: Light-Triggering the Self-Propulsion of Oil Droplets

et al. 2022

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The dynamic control of pH-responsive systems is at the heart of many natural and artificial processes. Here, we use photoacids, molecules that dissociate only in their excited state and transfer their proton to nearby proton acceptors, for the dynamic control of processes. A problem arises when there is a need to protonate highly acidic acceptors. We solve this problem using super photoacids that have an excited-state pK a of −8, thus enabling them to protonate very weak proton acceptors. The process that we target is the light-triggered self-propulsion of droplets, initiated by an excited-state proton transfer (ESPT) from a super photoacid donor to a surfactant acceptor situated on the surface of the droplet with a pK a of ∼0. We first confirm using steady-state and time-resolved spectroscopy that a super photoacid can undergo ESPT to the acidic surfactant, whereas a “regular” photoacid cannot. Next, we show self-propulsion of the droplet upon irradiating the solvated super photoacid. We further confirm the protonation of the surfactant on the surface of the droplet using transient surface tension measurements. Our system is the first example of the application of super photoacids to control dynamic processes and opens new possibilities in the field of light-triggered dynamic systems.

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“…Moreover, MOFs allow for tailoring a framework environment through skeleton modification or wall grafting (Scheme ). ,− ,,,− ,,− Furthermore, photoswitch behavior can be tuned by incorporation of different guest molecules within framework cavities, including the presence or absence of solvent molecules of different polarity. ,,− Thus, in this section, we discuss the advantages of coordination of photoresponsive molecules to metals in well-defined crystalline scaffolds and the corresponding effects on physicochemical properties of the material, as well as outline the potential scientific gaps in this area.…”

Section: Metal–organic Frameworkmentioning

confidence: 99%

Metal–Photoswitch Friendship: From Photochromic Complexes to Functional Materials

et al. 2022

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Cooperative metal–photoswitch interfaces comprise an application-driven field which is based on strategic coupling of metal cations and organic photochromic molecules to advance the behavior of both components, resulting in dynamic molecular and material properties controlled through external stimuli. In this Perspective, we highlight the ways in which metal–photoswitch interplay can be utilized as a tool to modulate a system’s physicochemical properties and performance in a variety of structural motifs, including discrete molecular complexes or cages, as well as periodic structures such as metal–organic frameworks. This Perspective starts with photochromic molecular complexes as the smallest subunit in which metal–photoswitch interactions can occur, and progresses toward functional materials. In particular, we explore the role of the metal–photoswitch relationship for gaining fundamental knowledge of switchable electronic and magnetic properties, as well as in the design of stimuli-responsive sensors, optically gated memory devices, catalysts, and photodynamic therapeutic agents. The abundance of stimuli-responsive systems in the natural world only foreshadows the creative directions that will uncover the full potential of metal–photoswitch interactions in the coming years.

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A metastable-state photoacid-based metal organic framework with multi-stimuli-responsive chromism

Cited by 9 publications

References 41 publications

Washable and stretchable fiber with heat and ultraviolet color conversion

Washable and stretchable fiber with heat and ultraviolet color conversion

Application of Super Photoacids in Controlling Dynamic Processes: Light-Triggering the Self-Propulsion of Oil Droplets

Metal–Photoswitch Friendship: From Photochromic Complexes to Functional Materials

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