Issue 12, 2022

Ultrafast visible-light photochromic properties of naphthalenediimide-based coordination polymers for the visual detection/filtration of blue light

Abstract

Two novel naphthalenediimide-based (NDI-based) coordination polymers (CPs), namely [Cd(3-PMNDI)(HNDC)2(DMF)] (1) and [Cd(4-PMNDI)(NDC)]·DMF (2) (H2NDC = 1,4-naphthalenedicarboxylic acid, 3-/4-PMNDI = N,N′-bis(3-/4-pyridylmethyl)-1,4,5,8-naphthalenediimide, DMF = N,N′-dimethylformamide), have been designed and synthesized here from positional isomeric electron-deficient PMNDI (electron acceptors, EAs) and electron-rich H2NDC (electron donors, EDs) in the presence of cadmium ions. The usage of the positional isomeric PMNDI ligands leads to the generation of a one-dimensional (1D) chain in 1 and a two-fold interpenetrated three-dimensional (3D) framework in 2. Interestingly, both compounds exhibit outstanding ultrafast visible-light photochromic properties based on photoinduced intermolecular electron transfer (PIET). The higher sensitivity of 1 and 2 to visible light relative to UV light could be ascribed to the typical arrangements of EDs/EAs in the interfacial contacts (ED–EA–ED in 1vs. ED–EA–EA–ED in 2). Furthermore, the difference in the number and strength of weak interactions (lone pair–π and π–π interactions) between EDs and EAs might be responsible for the discriminative photoresponsive rates (5 s for 1vs. 10 s for 2). Meanwhile, the different coloration states might be contributed by the distinct concentrations of the [PMNDI]˙ anionic radicals and their delicately different matrices or surrounding environments. Notably, both 1 and 2 are highly photosensitive to blue-light wavelengths, which can be viewed as typical of photochromic materials for the detection and filtration of blue light.

Graphical abstract: Ultrafast visible-light photochromic properties of naphthalenediimide-based coordination polymers for the visual detection/filtration of blue light

Supplementary files

Article information

Article type
Research Article
Submitted
12 Jan 2022
Accepted
15 Apr 2022
First published
17 Apr 2022

Inorg. Chem. Front., 2022,9, 2852-2861

Ultrafast visible-light photochromic properties of naphthalenediimide-based coordination polymers for the visual detection/filtration of blue light

P. Hao, B. Gao, G. Li, J. Shen and Y. Fu, Inorg. Chem. Front., 2022, 9, 2852 DOI: 10.1039/D2QI00100D

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