Dynamics of charge-transfer pairs in the cyano-bridged Co2+-Fe3+ transition-metal compound

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Dynamics of the charge-transfer (CT) pairs has been investigated for the cyano-bridged Co2+-Fe3+ particles grown in a hydrophilic cavities of Nafion 117 film. We decomposed the differential absorption spectra into the fast and slow components. We ascribed the fast and slow components to the Frank-Condon state and the CT (Co3+-Fe2+) pairs with lattice relaxation, respectively. We found that the lifetime tauCT of the pairs at 10 K increases with the absorbed photon density n from tauCT[approximate]2 ns to [approximate]6 ns, reflecting the attractive interaction between the pairs.