Luminescent and mechanical enhancement of phosphorescent hydrogel through cyclic insulation of platinum-acetylide crosslinker

Abstract

An insulated Pt-acetylide complex was incorporated into a polymer network as a crosslinker to afford a phosphorescent gel.

Luminescent Behavior of Gels and Sols Comprised of Molecular Gelators

“… Molecular structure of ( a ) Pt CD ; ( b ) Pt TEG ; ( c ) and ( d ) formation of a Pt CD -hydrogel and Pt TEG -hydrogel and ( e ) photograph of the Pt CD -hydrogel in daylight; scale bar = 1 mm. Republished from [ 42 ] with permission of Royal Society of Chemistry. …”

“…Usually, quenching of triplet states is addressed by following the emission of metal ions or by adding a phosphor that emits after energy transfer from a non-phosphorescent species in the gel. One example is the introduction of a spatially isolated Pt-acetylide crosslinker in an oligo(phenylene ethynylene), Pt TEG , to obtain a phosphorescent hydrogel [ 42 ]. In this case, permethylated α-cyclodextrins (PMα-CDs) were added to form a gelator "insulated" from external contact quenchers, Pt CD ( Figure 3 ).…”

Lanthanide-Doped Upconversion Nanoparticle-Cross-Linked Double-Network Hydrogels with Strong Bulk/Interfacial Toughness and Tunable Full-Color Fluorescence for Bioimaging and Biosensing

“…Smart fluorescent hydrogels as rising-star optical materials have been broadly explored for different fundamental and practical researches in fluorescent sensors, probes, imaging agents, photocatalysts, and light-emitting devices − because of their unique color change properties in absorption (chromogenic) or in emission (fluorochromic) in response to external stimulus such as humidity, temperature, pH, light, ionic strength, and mechanical force. A general straightforward approach for preparing fluorescent hydrogels is to incorporate fluorescent materials (e.g., fluorophores and chromophores) into the networks of hydrogels. − There are two typical organic and inorganic fluorescent materials with different fluorescence mechanisms. Organic fluorescent materials generally trigger fluorescence emission via unsaturated conjugation and extended π-cloud architectures, while inorganic fluorescent materials are often electronically excited from the ground state to the higher vibrational and rotational energy states.…”

Complementary Color Tuning by HCl via Phosphorescence-to-Fluorescence Conversion on Insulated Metallopolymer Film and Its Light-Induced Acceleration

“…Therefore, this system should improve the visibility of sensors or other security signals [9] and provide white emission materials. In our previous studies [22][23][24][25][26][27][28], we overcame the drawback of phosphorescent polymeric materials using a supramolecular approach. The platinum acetylide polymer backbones were completely covered with permethylated α-cyclodextrins (PM α-CDs), inhibiting molecular interactions between the adjacent conjugated chains (Figure 1b) [24].…”

“…Therefore, the phosphorescence of the polymer film was efficiently enhanced by insulating the platinum acetylide polymer ( Figure 1b, the upper photo). We have also applied this insulation strategy to other polymer materials such as a luminescent sensor for typical metal ions [26], a HCl-responsive polymer utilizing acid-induced isomerization [27], and phosphorescent hydrogels [28]. In the present work, we developed a colortunable material exhibiting white emission via the depolymerization of insulated Pt acetylide polymer that undergoes a PFC.…”