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Updated: Jan 8, 2026
Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
Irreversible photochromism induced by photo-induced cyanide vacancy over metal-organic frameworks containing metals
Honggang Zhang1, Shaozhi Liu1, Xiaolu Zhou1
1State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
Abstract:
Photochromism in metal-organic frameworks (MOFs) are primarily due to ligand isomerization and radical formation in previous reports. Herein, we discovered an alternative mechanism driven by photogenerated CN- vacancy in a bismuth-based MOF (BiFe(CN)6), which exhibits remarkable, stable and irreversible photochromic behavior without the introduction of guest molecules. Under light irradiation, BiFe(CN)6 exhibits a remarkable color change from brown to green, accompanied by the formation of CN- vacancy. Mechanism research indicates that the impact of full-shell valence electron configuration of Bi3+ on the charge transfer process is crucial for the formation of CN- vacancy, and analogues containing metals with full-shell valence electron configuration, such as ZnFe PBA and CdFe PBA, are also found to display irreversible photochromic behavior, proving the universality of this phenomenon. This vacancy-mediated photochromism represents a distinct pathway different from conventional mechanisms, shedding a light on designing smart photoresponse materials.
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