Tunable Second‐Level Room‐Temperature Phosphorescence of Solid Supramolecules between Acrylamide–Phenylpyridium Copolymers and Cucurbit[7]uril

Abstract

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.

Assembly and Applications of Macrocyclic-Confinement-Derived Supramolecular Organic Luminescent Emissions from Cucurbiturils

“…The key challenge of Q­[ n ]-based luminescent emissions under the corresponding macrocyclic confinement in the future is to develop more efficient luminescent systems such as NIR excitation and emission with better biological compatibility and stability, RTPs with tunable emission, longer lifetime, and higher QY in aqueous environment and the solid state, delayed fluorescence with ultralong lifetime, FRET between the fluorophores and phosphors with a more efficient pathway, and so on. ,,,,− Especially, it should be noted that nearly all the Q­[ n ]-derived RTP systems to date were derived from the 4-(4-bromophenyl)­pyridinium guest as the phosphor. So, the discovery of more unique Q­[ n ]-based supramolecular luminescent systems and their practical applications can be eagerly expected.…”

Nonconjugated Hyperbranched Polyether Emitting Ultralong Room Temperature Phosphorescence with Tunable Emission and Afterglow

“…In addition, tuning either emission or afterglow color and increasing the afterglow duration are still challenges. Some attempts have been made to regulate the emission color by grafting or doping luminophores to the polymers. ,− However, these luminophores generally have large conjugated structures and are tedious to synthesize.…”

Extraordinary Control of Photosensitized Singlet Oxygen Generation by Acyclic Cucurbituril-like Containers

“…However, little attention has been paid to the dynamics of the triplet excited state, − and 1 O 2 generation, , when encapsulated in the macrocyclic cavity. For example, cyclodextrins (CDs, Scheme ) help disaggregate poorly soluble dyes improving their overall photoactivity .…”