Bulk and surface switching in Mn-Fe-based Prussian Blue Analogues

T. T. A. Lummen; R. Y. N. Gengler; P. Rudolf; F. Lusitani; E. J. M. Vertelman; P. J. van Koningsbruggen; M. Knupfer; O. Molodtsova; J. -J. Pireaux; P. H. M. van Loosdrecht

doi:10.1021/jp711985f

arXiv · 0810.0175

Bulk and surface switching in Mn-Fe-based Prussian Blue Analogues

T. T. A. Lummen·R. Y. N. Gengler·P. Rudolf·F. Lusitani·E. J. M. Vertelman·P. J. van Koningsbruggen·M. Knupfer·O. Molodtsova·J. -J. Pireaux·P. H. M. van Loosdrecht

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Abstract

Many Prussian Blue Analogues are known to show a thermally induced phase transition close to room temperature and a reversible, photo-induced phase transition at low temperatures. This work reports on magnetic measurements, X-ray photoemission and Raman spectroscopy on a particular class of these molecular heterobimetallic systems, specifically on Rb0.81Mn[Fe(CN)6]0.95_1.24H2O, Rb0.97Mn[Fe(CN)6]0.98_1.03H2O and Rb0.70Cu0.22Mn0.78[Fe(CN)6]0.86_2.05H2O, to investigate these transition phenomena both in the bulk of the material and at the sample surface. Results indicate a high degree of charge transfer in the bulk, while a substantially reduced conversion is found at the sample surface, even in case of a near perfect (Rb:Mn:Fe=1:1:1) stoichiometry. Thus, the intrinsic incompleteness of the charge transfer transition in these materials is found to be primarily due to surface reconstruction. Substitution of a large fraction of charge transfer active Mn ions by charge transfer inactive Cu ions leads to a proportional conversion reduction with respect to the maximum conversion that is still stoichiometrically possible and shows the charge transfer capability of metal centers to be quite robust upon inclusion of a neighboring impurity. Additionally, a 532 nm photo-induced metastable state, reminiscent of the high temperature Fe(III)Mn(II) ground state, is found at temperatures 50-100 K. The efficiency of photo-excitation to the metastable state is found to be maximized around 90 K. The photo-induced state is observed to relax to the low temperature Fe(II)Mn(III) ground state at a temperature of approximately 123 K.

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T. T. A. Lummen, R. Y. N. Gengler, P. Rudolf, F. Lusitani, E. J. M. Vertelman, P. J. van Koningsbruggen, M. Knupfer, O. Molodtsova, J. -J. Pireaux, P. H. M. van Loosdrecht. 2008-10-01. Bulk and surface switching in Mn-Fe-based Prussian Blue Analogues. https://doi.org/10.1021/jp711985f

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