A room temperature phosphorescence encoding [2]rotaxane molecular shuttle

Ma, Xiang; Zhang, Jing; Cao, Jingjing; Yao, Xin; Cao, Tiantian; Gong, Yifu; Zhao, Chunchang; Tian, He

doi:10.1039/c6sc00769d

Cited by 70 publications

(41 citation statements)

References 94 publications

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“…Room-temperature phosphorescence (RTP) emitting materials have been one of the most extensively investigated luminescent materials in recent years due to their distinctive photophysical properties and wide applications in various elds including bioimaging, [1][2][3][4] organic light-emitting diodes, 5,6 molecular switches, 7,8 and so forth. Compared with traditional metal complexes and inorganic compounds, pure organic materials with RTP emission are gradually arousing people's interest because of their low cost and low toxicity.…”

Section: Introductionmentioning

confidence: 99%

A facile way to obtain near-infrared room-temperature phosphorescent soft materials based on Bodipy dyes

2020

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Section: Introductionmentioning

confidence: 99%

A facile way to obtain near-infrared room-temperature phosphorescent soft materials based on Bodipy dyes

2020

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“…Room‐temperature phosphorescence (RTP), which has larger Stokes shift, longer lifetime and hence better selectivity compared with fluorescence, has aroused intense attraction in diverse applications, such as biological imaging, molecular switches and organic light‐emitting diodes (OLED) . Noble metals such as platinum and iridium are often used in traditional inorganic and organometallic phosphorescent materials since metals can effectively promote the intersystem crossing (ISC) process, which enhances the RTP emission of these materials.…”

Section: Methodsmentioning

confidence: 99%

Employing Lactam Copolymerization Strategy to Effectively Achieve Pure Organic Room‐Temperature Phosphorescence in Amorphous State

Wang

Yan

Shi

et al. 2019

Advanced Optical Materials

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It is known that without noble metal, the spin flip between singlet states and triplet states is generally a forbidden process and that the long-lived triplet excitons of pure organic luminogens tend to undergo nonradiative decays including thermal motions, collision and exposure to quenchers such as oxygen. [6] Therefore, phosphorescence from metal-free materials is normally observed at low temperature (e.g., 77 K) and under inert conditions (e.g., protection by argon gas). [7] Tang and co-workers proposed crystallization-induced phosphorescence (CIP) mechanism, through which efficient RTP materials can be constructed. [8] Still, crystalline RTP materials require strict growth conditions, which might restrict their processability in applications.To overcome these shortcomings, several metal-free amorphous RTP materials have been reported. Methods of embedding pure organic phosphors into rigid polymer matrices, macro cycle hosts, or supramolecular hosts either covalently linked or noncovalently adsorbed are commonly used to inhibit nonradiative decay and enhance RTP emissions. [9] Amide phosphorescent polymers are frequently reported due to the rigid environment provided by both polymer matrices and hydrogen bonds. Our group has prepared several acrylamide copolymers, which are typical examples. [10] Nevertheless, the pure organic amorphous polymeric systems with effective RTP emission are still rare. Till now, amide copolymers with lactam structures bringing out RTP have rarely been reported, while poly(N-vinylpyrrolidone) (PVP) and poly(N-vinylcaprolactam) (PNVCL) are good candidates with facile preparations and wide availability of monomers.In this work shown in Scheme 1, a design strategy was presented for pure organic phosphorescent polymers (PVP-BrNpA, PVP-BA, PVP-BrHexene, PNVCL-BrNpA, PNVCL-BA and PNVCL-BrHexene) by copolymerizing lactam monomers, namely, N-vinylpyrrolidone (NVP) and N-vinylcaprolactam (NVCL) with small amounts of other monomers, benzonic acid (BA), bromonaphthalimide (BrNpA) and 6-Br-1-Hexene (BrHexene). Several PVP-and PNVCL-based copolymers emit notable RTP signals with diverse emission properties. The polymer matrices provide rigid environment for the phosphors, which restricts thermal motions and results in significant RTP emissions.PVP-BrNpA, PVP-BA, and PVP-BrHexene, which have five-membered lactam rings in their polymer chains, were Pure organic, amorphous room-temperature phosphorescent (RTP) materials have aroused great attention because of their easy preparation and wide applications. Herein, several metal-free, amorphous, lactam phosphorescent copolymers are prepared. Copolymers of N-vinylpyrrolidone (NVP) and N-vinylcaprolactam (NVCL) with small amounts of monomers exhibit diverse RTP emissions. The rigid polymer matrices of poly(N-vinylpyrrolidone) (PVP) and poly(N-vinylcaprolactam) (PNVCL) effectively help to inhibit nonradiative transition process of phosphors, which enhances the RTP emission. Furthermore, outstanding biocompatibility, low cost, and highly hydrophilic ch...

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“…Ma et al have published a [2]rotaxane molecular shuttle 17 that has a platinum(II) porphyrin appended onto a crown ether macrocycle (Figure ), which is stoppered at one end by an anthracene component …”

Section: Rotaxanes With Porphyrins Embedded Within the Macrocycle mentioning

confidence: 99%

Porphyrin‐Containing Rotaxane Assemblies

Hewson

Mullen

2019

Eur J Org Chem

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Porphyrins have been widely recognized for their unique photo‐ and electrochemical properties as well as their crucial roles in a wide variety of biological processes including catalysis, oxygen transport, and photosynthesis. In addition, their size and predictable coordination geometries makes them attractive components in the assembly of functional supramolecular assemblies. Advances in porphyrin synthesis have enabled their incorporation into rotaxanes not only as stoppers but also as components of the macrocycle, or even higher order rotaxane architectures, each design imparting unique functionality either through redox, fluorescence, or coordination environment. Here we describe advances in the synthesis of increasingly complex porphyrin‐containing rotaxane assemblies and their dynamic properties that arise from the porphyrin inclusion.

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A room temperature phosphorescence encoding [2]rotaxane molecular shuttle

Abstract: The shuttling of an acid–base switchable bistable [2]rotaxane is addressed by room temperature phosphorescence emission signals.

Cited by 70 publications

References 94 publications

A facile way to obtain near-infrared room-temperature phosphorescent soft materials based on Bodipy dyes

A facile way to obtain near-infrared room-temperature phosphorescent soft materials based on Bodipy dyes

Employing Lactam Copolymerization Strategy to Effectively Achieve Pure Organic Room‐Temperature Phosphorescence in Amorphous State

Porphyrin‐Containing Rotaxane Assemblies

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