A series of solid supramolecules based on acrylamide-phenylpyridium copolymers with various substituent groups (PÀ R: R =À CN, À CO 2 Et, À Me, À CF 3 ) and cucurbit [7]uril (CB[7]) are constructed to exhibit tunable second-level (from 0.9 s to 2.2 s) room-temperature phosphorescence (RTP) in the amorphous state. Compared with other solid supramolecules PÀ R/CB [7] (R =À CN, À CO 2 Et, À Me), PÀ CF 3 /CB [7] displays the longest lifetime (2.2 s), which is probably attributed to the fluorophilic interaction of cucurbiturils leading to a uncommon host-guest interaction between 4-phenylpyridium with À CF 3 and CB [7]. Furthermore, the RTP solid supramolecular assembly (donors) can further react with organic dyes Eosin Y or SR101 (acceptors) to form ternary supramolecular systems featuring ultralong phosphorescence energy transfer (PpET) and visible delayed fluorescence (yellow for EY at 568 nm and red for SR101 at 620 nm). Significantly, the ultralong multicolor PpET supramolecular assembly can be further applied in fields of anti-counterfeiting and information encryption and painting.

Slide-ring materials with movable cross-links have received attention due to their excellent mechanical properties. However, due to the poor solubility of polyrotaxane and low synthesis efficiency, their applications are hindered. Here, we use hydroxypropyl-modified α-cyclodextrin (Hy-α-CD) and Acrylamide-PEG20000-Acrylamide (ACA-PEG20000-ACA) to construct a polypseudorotaxane with good water solubility. Through photo-initiated polymerization of polypseudorotaxane with acrylamide in-situ, the capped polyrotaxane was easily obtained and further cross-linked by 1,4-butanediol diglycidyl ether in sodium hydroxide solution to form a slide-ring supramolecular hydrogel. The hydrogel can be stretched to 25.4 times its original length, which recovers rapidly on unloading, and the addition of Ca2+ ions during crosslinking enhances ionic conductivity. The Ca2+-doped hydrogels are used to prepare wearable strain sensors for monitoring human motion.

exploration of new chromophores and stimuli-responsive luminogens, and so on. [7] As efficient means and strategies, supramolecular assembly and host-guest chemistry exhibit numerous advantage in facilitating fluorescence emission of organic small molecules. [8] Particularly, macrocyclic compounds with unique cavity structure, such as cyclodextrins, [9] cucurbiturils, [10] crown ethers, [11] and so on, [12] can form host-guest complexes or supramolecular assemblies with organic molecules to keep from quenching caused by molecular motion or aggregation, and have been widely used to construct smart luminescent materials.

Purely organic room‐temperature phosphorescence (RTP), especially blue phosphorescence, has aroused considerable attention in organic optoelectronic applications. Herein, a purely solid supramolecular assembly with blue phosphorescence is constructed by 6‐bromoisoquinoline‐modified β‐cyclodextrin (CD‐IQ), acrylamide (AAm), and cucurbit[7]uril (CB[7]) based on in situ photopolymerization strategy, accompanied by blue RTP emission at 450 nm. The abundant hydrogen‐bonding network between the formed polyacrylamide matrix and the β‐CD effectively restricts the motion of the 6‐bromoisoquinoline chromophore and suppresses the nonradiative transition, realizing purely blue RTP emission. As compared with CD‐IQ‐polymer, supramolecular assembly between CB[7] and CD‐IQ can improve the quantum yield and lifetime from the initial 25.5% and 238.47 ms to 49.41% and 268.9 ms, respectively, which is attributed to the confinement effect of the cucurbituril hydrophobic cavity, and can be further applied in fields of anti‐counterfeiting, information encryption, and writing.

ditions need to be met, one is to improve the inter-system crossing efficiency, and the other is to suppress the non-radiative relaxation process. [10][11][12][13][14] Based on this, many interesting RTP systems have been developed through rational design in the past few years. [15][16][17][18] For example, the introduction of heavy atoms or carbonyl and groups containing other heteroatoms with abundant lone-pair electrons into organic molecules can effectively increase the SOC constant, thereby achieving efficient intersystem crossing (ISC). [19][20][21][22][23] In addition, by introducing intermolecular charge-transfer states in single-component crystals and multi-component doping systems, the singlet-triplet energy gap can be minimized to accelerate the ISC rate to achieve phosphorescence emission. [24][25][26][27] At the same time, many brilliant strategies such as molecular aggregation (including H-aggregation, π-π stacking, and n-π stacking), [28][29][30][31] crystallization, [32][33][34][35] polymerization, [36][37][38][39] host-guest complexation, [40,41] carbon dots and clusterizationtriggered emission have also been used to construct RTP systems. [42,43] Despite the exciting development of RTP, so far, most RTP systems for pure organic compounds have been realized in the crystal state, and the demanding growth condition and uncontrollable growth process required for crystal cultivation have hindered their practical application to a certain extent. Therefore, it is imperative to design and develop a facile and general strategy to obtain amorphous pure organic compounds with efficient RTP emission.In supramolecular chemistry, the assembly strategy of hostguest complexation has excellent advantages in the fabricating of tunable and smart organic luminescent materials in aqueous media and the solid state. [44][45][46][47] In recent years, there have been more and more studies using the cavity confinement effect of the macrocycle (especially for cyclodextrin and cucurbituril) to induce organic single-molecule phosphorescence emission. [48][49][50] For example, our group reports an unprecedented enhancement of the phosphorescence quantum yield of bromophenyl-methyl-pyridinium chloride from 2.6% to 81.2% by complexing with cucurbit[6]uril. [51] However, there are few reports showing that organic single molecules induce phosphorescence of macrocycles in host-guest complexes because the charge Herein, two kinds of amorphous solid-state supramolecular systems with purely organic room temperature phosphorescence (RTP) from calix[3] phenothiazine (C[3]Pz) activated by 1,2-/1,3-dicyanobenzene (1,2-/1,3-DCB) are reported. Different from macrocycle-confined guest phosphorescence emission, RTP of these two amorphous solid-state supramolecular systems is entirely from the 1,2-/1,3-DCB rivets C[3]Pz cavity to form dense supramolecular complex through CH … π interactions, leading to two different phosphorescence emissions at 566/524 nm under 430 nm excitation, respectively. Although C[3]Pz shows a regular arrangement in ...