A new photochromic-ligand-based luminescent coordination polymer as a MnO4− sensor with extremely high sensitivity and excellent selectivity. Issue 5 (17th January 2022)

• Record Type: Journal Article
• Authors: Lin, Zhuo; Li, Wenjing; Chen, Quan; Chen, Ling; Zhang, Chi; Zhang, Jinfang
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 5(2022)
• Page Start: 1672
• Page End: 1680
• Publication Date: 2022-01-17
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc05406f
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A new dihydroanthracene-based photochromic ligand was developed to construct a photochromic luminescent coordination polymer as the first sensing application, which has resulted in an outstanding MnO4 − sensor. Abstract : Photochromic materials have attracted considerable attention because of their promising applications. Herein, the first dihydroanthracene-based photochromic organic ligand 9, 10-bis(di(pyridine-4-yl)methylene)-9, 10-dihydroanthracene (L ) was successfully synthesized. Its photochromic mechanism has been elucidated. The photochromic organic molecule was first developed as a functional ligand to construct an LCP/LMOF-based sensor material {[Cd1.5 (L)(HOBA)(EtOH)(SO4 )(H2 O)]·3H2 O} n (1 ) (LCP/LMOF = luminescent coordination polymer/luminescent metal–organic framework; H2 OBA = 4, 4′-oxybisbenzoic acid; EtOH = ethanol). 1 exhibits a very rare 1D triple-chain architecture, and possesses good water stability and high sensing sensitivity to MnO4 − . More importantly, 1′ (1 after photochromism) exhibits extremely high sensitivity for detecting MnO4 − in aqueous media. Its K sv (quenching constant, 3.74 × 10 6 M −1 ) is nearly 28 and 8 times more than that of 1 (1.36 × 10 5 M −1 ) and the reported highest value (4.49 × 10 5 M −1 ) for MnO4 − sensor materials, respectively. Moreover, 1′ has excellent MnO4 − sensing selectivity and stable sensing ability at different pH. Especially, 1′ can recognize MnO4 − in the presence of similar strong oxidized anions CrO4 2− and Cr2 O7 2− . The MnO4 − test paper is successfully developed as a convenient tool for practical application. The mechanisms behind the outstanding MnO4 − sensing properties of 1′ were studied as well.