Synchronous electrochromism and electrofluorochromism in a zirconium pyrenetetrabenzoate metal-organic framework

28 November 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Redox-active materials which exhibit both electrochromism and electrofluorochromism have great potential as multifunctional elements in optoelectronics. Here we present in situ spectroelectrochemistry on NU-1000, a zirconium pyrenetetrabenzoate metal-organic framework. A thin film of NU-1000 exhibits reversible color changes between light yellow and dark blue when subjected to an alternating electrochemical potential. In situ fluorescence excitation-emission spectral mapping elucidates a dominant blue emission of highly fluorescent electrochromic NU-1000 that is being quenched via an oxidation reaction. Density-functional theory calculations reveal the the forbidden optical transition between the singly-occupied molecular orbital (SOMO) and the lowest unoccupied molecular orbital (LUMO) in the oxidized linker as the cause of the quenching. Double potential step chronoamperometry meaures response times as fast as a dozen seconds and excellent switching stability over 500 cycles without noticeable attenuation of the color contrast. These findings provide valuable insight into the electrochromism and electrofluorochromism in metal-organic frameworks, offering exciting opportunities for developing advanced multifunctional porous materials with potential applications in optoelectronics and sensing.


Metal-organic frameworks
Fluorescence spectroscopy
Density-functional theory

Supplementary materials

Synchronous electrochromism and electrofluorochromism in a zirconium pyrenetetrabenzoate metal–organic framework
Supplementary Information


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.