Observation of excited state absorption in the V-Cr Prussian blue analogue

Luke Hedley, Mitchel Horbury, Florian Liedy, Johan Olof Johansson

Research output: Contribution to journalArticlepeer-review

Abstract

We present femtosecond transient transmission measurements of thin films of the VII/III-CrIII Prussian blue analogue (V-Cr PBA) in the spectral range 330−675nm after exciting the ligand-to-metal charge-transfer transition (LMCT) at 400nm. A global analysis including three decay-times of τ1=230fs, τ2=1.38ps and τ3>>2ns could satisfactory describe the data. We observed an excited state absorption (ESA) at 345nm, which was attributed to a charge-transfer transition from the 2E state on the Cr ions after fast intersystem crossing from the quartet manifold. An additional weak and short-lived ESA at 455nm was also observed and was tentatively attributed to the initially populated 4LMCT state.
Original languageEnglish
JournalChemical Physics Letters
Early online date8 Sep 2017
DOIs
Publication statusE-pub ahead of print - 8 Sep 2017

Keywords

  • Ultrafast spectroscopy
  • Prussian blue analogues
  • Charge-transfer transitions
  • Functional materials
  • Thin films
  • Spectroelectrochemistry

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