Preparation of Naphthalenediimide-Decorated Electron-Deficient Photochromic Lanthanide (III)-MOF and Paper Strip as Multifunctional Recognition and Ratiometric Luminescent Turn-On Sensors for Amines and Pesticides
Rong Huo, Chen Wang, Mei Yan Wang, Ming Yang Sun, Shan Jiang, Yong Heng Xing, Feng‐Ying Bai
Abstract
Detecting toxic amine and pesticide contamination in the environment is one of the most pressing issues for environmental sustainability. In this work, two 3D Ln-BINDI complexes [Ln = Eu (1), Sm (2); H 4 BINDI ( N, N ′-bis(5-isophthalic acid)-1,4,5,8-naphthalenediimide)] have been designed and synthesized. Crystal structure of [Eu 2 (BINDI) (NO 3 ) 2 (DMA) 4 ]·2DMA (complex 1 ) featuring the lvt topology was determined by X-ray single-crystal diffraction. A multi-functional ratiometric luminescence sensor benefitting from π-electron-deficient NDI moieties and f–f transition characteristics of lanthanide Eu 3+ ions for complex 1 has been investigated. Markedly, complex 1 exhibit completely different selective fluorescence ratiometric turn-on responses and pretty high sensitivity behaviors to aromatic amines (OPD), aliphatic amines ( n -BA), and pesticides (TBZ), respectively, which are driven by interactions between the electron-donating amino group and acceptor NDI site, contributing to complex 1 as a potential ratiometric luminescent turn-on sensor for practical environmental applications. A PVA/ 1 @paper strip can be used as a potential size selectivity sensor for the practical detection of aliphatic amine vapors in the environment through visual chromic fluorescence enhancement. Because NDIs can undergo one-electron reduction to form stable NDI · free radicals, solid complex 1 can visually distinguish different kinds of amines by selective amine-specific color changes and has the photochromic property of erasable inkless printing.