Ultrasensitive photochromic and Raman dual response to ethylenediamine gas through polyoxometalate–viologen crystalline hybrid

Abstract

A new crystalline complex is successfully synthesized based on Dawson type polyoxometalate and amino substituted viologen. It exhibits ultrasensitive photochromic and Raman dual response to ethylenediamine gas.

Recent progress in polyoxometalate–viologen photochromic hybrids: structural design, photochromic mechanism, and applications

“…However, in the detection of toxic amines, how to quickly and conveniently analyze and determine the category and concentration of toxic amines is still a huge challenge, and it is of great significance to human life and health and rapid treatment. In 2022, 188 Gao and co-workers synthesized and reported a class of highly sensitive POM–viologen crystalline photochromic hybrid materials with selective detection for ethylenediamine (H 2 AV)[H 2 (P 2 W 18 O 62 )]·9.5H 2 O (AV = N , N ′-bis(δ-aminopropyl)-4,4′-bipyridinium)(Fig. 18).…”

Ratiometric SERS detection of N2H4 by porous Ag(i)-linked Waugh-type polyoxometalate as an efficient label-free substrate

“…[16][17][18][19] Previous studies also indicated that different POMs have characteristic Raman signals coming from the vibration of different M-O (M = Mo or W) bonds, which reveals that POMs can be used as inorganic Raman signal molecules. 20,21 In addition, for silver ions, they have a strong affinity for oxygen atoms, and thus they easily coordinate with surface oxygen atoms in POMs to form different crystalline compounds. 22,23 Based on the above analysis, it is assumed that if POMs directly connect with Ag + to construct 3D porous frameworks, it may present high Raman activity.…”

A novel ZnO/viologen photochromic composite film with a rapid UV response for rewritable paper, solar UV detection, smart windows and anti-counterfeiting

“…11 The photosensitizer performance of viologen-based photochromic materials can be improved by regulating their structure and composition through methods such as nitrogen substituent modification, 12,13 counteranion 14,15 and inorganic-organic hybridization. [16][17][18][19] Recently, many novel inorganic-organic hybrid crystalline materials based on viologens and transition metals 9,[20][21][22] or polyoxometalates [23][24][25] have been developed. These materials exhibit a fast response and a dense packing mode, which enables long-lifetime charge separation and stable color retention.…”