Light‐Activated Sensitive Probes for Amine Detection

Abstract

Our new, simple, and accurate colorimetric method is based on diarylethenes (DAEs) for the rapid detection of a wide range of primary and secondary amines. The probes consist of aldehyde- or ketone-substituted diarylethenes, which undergo an amine-induced decoloration reaction, selectively to give the ring-closed isomer. Thus, these probes can be activated at the desired moment by light irradiation, with a sensitivity that allows the detection of amines at concentrations as low as 10 m in solution. In addition, the practical immobilization of DAEs on paper makes it possible to detect biogenic amines, such as cadaverine, in the gas phase above a threshold of 12 ppbv within 30 seconds.

A Diarylethene‐Based Photoswitch and its Photomodulation of the Fluorescence of Conjugated Polymers

“…These materials always involve photochromic molecules, including azobenzene, spiropyran, diarylethene, Stenhouse, and so on, which can respond to light as an external stimulus and undergo a reversible change in chemical structure, or geometry, or charge distribution, subsequently leading to variation in the absorption and emission properties. Among them, diarylethene and its derivatives have been regarded as one of the most promising candidates for photoswitchable materials, because of their superior advantages such as thermal stability of both isomers, good fatigue resistance, rapid response, and high sensitivity ,…”

Fluorescent Diarylethene Photoswitches—A Universal Tool for Super‐Resolution Microscopy in Nanostructured Materials

“…Diarylethenes (DAE) are one of the most promising classes of organic photoswitches, due to their various potential appli cations in data storage, chemical sensing, and as nanomate rials. [36][37][38][39] Despite the multitude of different diarylethene deriv atives available, only few of them exhibit, in their closed form, strong fluorescence in the visible range in conjunction with adjustable switching rates. As a consequence, their application for SRI has been limited so far.…”

Imine‐based dynamic polymer networks as photoprogrammable amine sensing devices

“…Previous approaches aiming at the detection of (biogenic) amine vapors involved (solid state) sensors based on colorimetric changes as well as “turn‐on” and “turn‐off” fluorescence. Recently, our group reported on a photoresponsive system, which only in the “on‐state” is subject to an amine‐induced decomposition, accompanied by either an indicative decoloration or photoluminescence change of the material . Furthermore, due to differently colored switching states (colorless “off‐state”), information storage in the device is feasible.…”

“…Recently, our group reported on a photoresponsive system, which only in the "on-state" is subject to an amine-induced decomposition, accompanied by either an indicative decoloration or photoluminescence change of the material. 12,13 Furthermore, due to differently colored switching states (colorless "off-state"), information storage in the device is feasible. Yet, while showing a rather high sensitivity, along with the "photoprogrammable" nature as an incidental cofeature, indicative decoloration of the "on-state" is irreversible, making the material a single use device and preventing possible reprogramming.…”