Far‐Infrared Spectroscopic Investigation of CoFe Prussian Blue Analogues at Thermally Activated Electron Transfer
Year: 2024
Type: article
Abstract: A series of Prussian Blue Analogues (PBAs) having the chemical formula KxCsyCo4[Fe(CN)6](8+x+y)/3⋅nH2O was investigated by variable temperature far‐infrared spectroscopy. The compounds with the lowest amounts of interstitial alkali cations exhibit the thermally activated CoII(High Spin)FeIII ⋅ CoIII(Low Spin)FeII electron transfer, whereas above a threshold of two alkali cations per unit cell the compounds are in the CoIII(Low Spin)FeII electronic state at room temperature and remain in this electronic state over the 300–15 K temperature range. Our variable temperature study shows that FIR spectroscopy turns out to be particularly well‐suited to probe local interactions between the alkali cations in interstitial sites of PBAs and the surrounding cyanide‐bridged bimetallic network as well as to disentangle electronic and structural phenomena involved in the switching properties.
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4404818441