High-contrast flicker luminescence on dynamic covalent structure based nanoaggregates

Zhou, Yunyun; Hua, Panpan; Wu, Bin; Bao, Xiaoyan; Li, Xuping; Zhu, Liangliang

doi:10.1007/s11426-018-9365-x

Cited by 13 publications

(2 citation statements)

References 55 publications

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“…Dynamic emission with time-resolution characteristics has received significant attention in photoluminescent probe techniques (41)(42)(43). After establishing such a photoresponsive system, we investigated its flicker emission imaging (44,45) at the cellular level. Before endocytosis for imaging, cytotoxicity evaluation is an important parameter to consider.…”

Section: Mechanism Study For the Phosphorescence Amplification Bymentioning

confidence: 99%

Photoexcitation-controlled self-recoverable molecular aggregation for flicker phosphorescence

Jia

Shao

Bai

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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106

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Chemical systems with external control capability and selfrecoverability are promising since they can avoid additional chemical or energy imposition during the working process. However, it remains challenging to employ such a nonequilibrium method for the engineering of optoelectronic function and for visualization. Here, we report a functional molecule that can undergo intense conformational regulation upon photoexcitation. It enables a dynamical change in hydrophobicity and a follow-up molecular aggregation in aqueous media, accordingly leading to an aggregation-induced phosphorescence (AIP) behavior. This successive performance is self-recoverable, allowing a rapid (second-scale cycle) and long-standing (>10 3 cycles) flicker ability under rhythmical control of the AIP. Compared with traditional bidirectional manipulations, such monodirectional photocontrol with spontaneous reset profoundly enhances the operability while mostly avoiding possible side reactions and fatigue accumulation. Furthermore, this material can serve as a type of luminescent probe for dynamically strengthening visualization in bioimaging.A rtificial molecular switches continue to attract research attention due to their fascinating structures and smart control performances (1-5). Nevertheless, most of these chemical systems work between two or more stable states, and the rest of them requires at least a secondary chemical or energy stimuli, imposing additional inconvenience and the possibility of doubling fatigue accumulation (6-8). Inspired by the underlying mechanism of functional natural systems, scientists began to design and develop molecules with self-recoverability for nonequilibrium action control (9-11). Among the control methods, photocontrol is still a superior fashion because light stimuli are usually rapid and precise, and can be operated remotely (12,13). In contrast to well-studied photochemical processes like photoreaction, photocyclization, and photoisomerization (14, 15), a photocontrol approach with selfrecoverability largely connects to a photoexcitation principle. Thus, it may generally suffer from ultrafast energy relaxation and dissipation, and is extremely difficult to be utilized in materials. Engineering of optoelectronic function and visualization via such a photocontrol method is particularly challenging but also desirable.While luminescent probe techniques enabled a significant scientific advancement in visualized analysis, sensing, and imaging (16)(17)(18), in this work, we expect to impose a photocontrol with self-recoverability into the advancing of operating methods for molecular luminescence. Aggregation-induced emission (AIE) is a type of approach where the molecules can exhibit high luminescence in condensed or constraint states by overcoming the aggregation-caused quenching effect (19)(20)(21). Controllable AIE probes that utilize specific chemical reactions have emerged to facilitate a series of frontier biological usage (22)(23)(24)(25). In contrast, the necessity of spontaneous, repeatable, and rhyth...

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Section: Mechanism Study For the Phosphorescence Amplification Bymentioning

confidence: 99%

Photoexcitation-controlled self-recoverable molecular aggregation for flicker phosphorescence

Jia

Shao

Bai

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

106

View full text Add to dashboard Cite

show abstract

“…However, most of these stimuli-responsive processes tend to be slow and incomplete, fostering generally mild changes in material properties. By contrast, chemical reactiondriven stimuli responses, such as pH change, redox reactions, and coordination effects, are usually rapid and sufficiently extensive because of direct contact between the interacting species [22][23][24][25][26][27][28][29] . Nonetheless, this type of stimuli-responsive behavior is generally only effective in solutions.…”

mentioning

confidence: 99%

Lighting up solid states using a rubber

Wang

Baryshnikov

et al. 2021

Nat Commun

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It is crucial and desirable to develop green and high-efficient strategies to regulate solid-state structures and their related material properties. However, relative to solution, it is more difficult to break and generate chemical bonds in solid states. In this work, a rubbing-induced photoluminescence on the solid states of ortho-pyridinil phenol family was achieved. This rubbing response relied on an accurately designed topochemical tautomerism, where a negative charge, exactly provided by the triboelectric effect of a rubber, can induce a proton transfer in a double H-bonded dimeric structure. This process instantaneously led to a bright-form tautomer that can be stabilized in the solid-state settings, leading to an up to over 450-fold increase of the fluorescent quantum yield of the materials. The property can be repeatedly used due to the reversibility of the tautomerism, enabling encrypted applications. Moreover, a further modification to the structure can be accomplished to achieve different properties, opening up more possibilities for the design of new-generation smart materials.

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Orthogonally Incorporating Dual‐Fluorescence Control into Gated Photochromism for Multifunctional Molecular Switching

Weng

Zhang

et al. 2019

Chemistry A European J

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Gated photochromism is of interest for the operation and control of modern high‐tech optofunctional materials. For further advancing this topic towards the achievement of multifunctional molecular switching, however, it remains a great challenge to incorporate multiple fluorescence regulation into gated photochromism in one unimolecular system. Herein, it is reported that a dithienylethene derivative DTEN with a Schiff base connection can be facilely synthesized by one‐step coupling, and it enabled distinct color and spectral changes upon different stimuli, including ultraviolet, visible light, Ni2+, and Al3+. Relying on hydrazine and hydroxy units in this molecule, compound DTEN exhibited novel Ni2+‐locked photochromic characteristics originating from complexation of the compound with Ni2+ in a 2:1 stoichiometry. On the other hand, a 1:1 complexation between compound DTEN and Al3+ could allow both of the initial and photostationary states of DTEN to display fluorescent enhancement and a redshift, realizing a dual‐fluorescence “turn‐on” sensing of Al3+ by light. On this basis, it is argued that the switching of the coordination mode between DTEN and Ni2+ or Al3+ brings up the possibility of tunable photoswitching by multiple stimuli, which offers a novel way for future development of multifunctional switching materials with different input and output signals, as exemplified by the construction of a delicate molecular circuit.

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High-contrast flicker luminescence on dynamic covalent structure based nanoaggregates

Cited by 13 publications

References 55 publications

Photoexcitation-controlled self-recoverable molecular aggregation for flicker phosphorescence

Photoexcitation-controlled self-recoverable molecular aggregation for flicker phosphorescence

Lighting up solid states using a rubber

Orthogonally Incorporating Dual‐Fluorescence Control into Gated Photochromism for Multifunctional Molecular Switching

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