Dynamics of the charge transferred states relevant to magnetic phase transition in rubidium manganese hexacyanoferrate

Photoinduced charge transfer dynamics in the photomagnetic material RbMn[Fe(CN)(6)], which exhibits a magnetic phase transition with a large hysteresis loop (230-300 K). has been investigated by observing the CN- stretching modes, which are sensitive to the valences of the adjacent transition metal tons. Mid-infrared transient absorption measurements were performed between 2013 and 2179 cm(-1) to observe the transient and persistent products The sample in the high-temperature phase was excited by 400 nm laser pulses at the ligand to metal charge transfer band neat the high-temperature end of the hysteresis loop. Bleach of the Fe3+-CN--Mn2+ band representing a decrease of the high-temperature phase and increases of the FC2+-CN--Mn3+ and Fe2+-CN--Mn2+ bands were observed in picosecond time region, indicating a transient production of charge transferred states. (C) 2009 Elsevier B.V. All rights reserved.