Photoactive Anthracene-9,10-dicarboxylic Acid for Tuning of Photochromism in the Cd/Zn Coordination Polymers.
Qi LiQian ZhangZhen-Zhen XueJi-Xiang HuGuo-Ming WangPublished in: Inorganic chemistry (2022)
Electron transfer photochromic materials with photo-triggered radicals have received huge interest from chemists due to their potentialities in anticounterfeiting, displays, energy conversion, and information storage. However, utilizing the sole carboxylic acid to synthesize novel electron transfer photochromic species is still confronted with huge challenges. Herein, an acentric three-dimensional network Cd 2 (ADC) 2 (DMF) 2 (H 2 O) ( 1 ; ADC = anthracene-9,10-dicarboxylate; DMF = N , N -dimethylformamide) and a two-dimensional layer Zn(ADC)(H 2 O)·DMA·H 2 O ( 2 ; DMA = N , N -dimethylacetamide) were synthesized and characterized via a photoactive H 2 ADC ligand. Both compounds exhibited electron transfer photochromism with the formation of radical photoproducts at the solid state, which was revealed by IR, UV-Vis absorption, photoluminescence and electron spin resonance spectra, and magnetic susceptibility measurements. Density functional theory calculations for 1 showed that the coloration process is a metal-assisted ligand-to-ligand electron transfer process between adjacent ADC molecules, and photogenerated stable radicals are delocalized over the ADC components. Compared with 1 , the shorter distances between ADC components via coordination bonds promoted 2 to exhibit a higher coloration efficiency and larger quantity of photogenerated radicals. Furthermore, both compounds showed unexpected radical-actuated photochromism in aqueous solution. This work showed that the carboxylic acid ligands, without viologen acceptors, could construct the electron transfer photochromic complexes, showing a novel kind of ligand for the design of hybrid photochromic materials.
Keyphrases
- electron transfer
- density functional theory
- diffusion weighted imaging
- diffusion weighted
- contrast enhanced
- molecular dynamics
- aqueous solution
- solid state
- magnetic resonance imaging
- healthcare
- heavy metals
- health information
- risk assessment
- quantum dots
- molecular dynamics simulations
- high resolution
- social media
- ionic liquid
- genetic diversity
- room temperature
- solar cells
- transition metal