A Ratiometric Afterglow Response of Aluminium Ions in Methanol‐Water

Abstract

An afterglow is beneficial as an emission signal in the field of displays and imaging probes. Here, boronic acidappended and spirolactam ring-containing rhodamine dye 1 was synthesized and grafted onto the surface of roomtemperature phosphorescence-active boronate nanoparticles (BPs), composed of polymeric 3-benzo-2,4,8,10-tetraoxa-3,9diboraspiro[5.5]undecane. The resultant ensemble, 1@BP, exhibited a greenish afterglow. However, the addition of Al 3 + into the dispersion solution with 1@BP led to a change in the afterglow to grass green as a result of Förster-type energy transfer from the phosphorescent BP to the Al 3 + -interacting rhodamine dye 1 on the surface. Based on the ratio of the two emission intensities, a linear response in the concentration range of 3.8-15.2 μM was observed, with a detection limit of 4.2 μM for Al 3 + . A metal ion-dependent discernable color in afterglow was observed on a 1@BP-coated filter paper, which would be useful for not only film-based afterglow chemosensors but also encryption application.

Chemometrics-assisted mechanism study of the room-temperature phosphorescence on nanoscopic boronate assemblies

“…1a and b). 23 The surface of boronate assemblies can be facilely functionalized with boronic acid-containing dyes, enabling various applications such as trace-water sensing 23 and Al 3+ ion sensing, 24 utilizing their afterglow properties in solution. From an application point of view, the origin of the significant RTP behavior of the boronate assemblies should be clarified.…”