| Abstract
| - A soluble molecular analogue of photoresponsive Co/Fe Prussian blues is described within thisreport. As judged via a variety of spectroscopic, magnetic, and crystallographic methods, electron transferwithin the octanuclear complex (below 250 K) converts paramagnetic red crystals into green diamagneticones. The color and magnetic changes are associated with the transformation of FeIIILS-CN-CoIIHS unitsinto FeIILS-CN-CoIIILS fragments in manner that is identical to that found for the An[Co(OH2)(6-6m)][Fe(CN)6]m·xH2O(An = alkali metal cation) family of three-dimensional Prussian blues. Moreover, this intramolecular electrontransfer can be quantitatively circumvented via rapid thermal quenching and reversed via simple whitelight irradiation at low temperatures. Remarkably the data suggests that thermally or photoinducedparamagnetic metastable phases are identical and exhibit long relaxation times that approach 10 years at120 K.
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