The synthesis, structural characterization, and magnetic properties of a new Prussian blue analogue, the moleculebased ferrimagnet (V IV O)[Cr III (CN) 6 ] 2/3 ‚ 10 / 3 H 2 O (1) (T C ) 115 K), are presented. The crystal structure is determined from the powder X-ray diffraction diagram using the Rietveld method. The system is cubic, space group Fm3m with cell parameter a ) 10.490(4) Å. The value of the exchange coupling parameter J (-48 cm -1 ) between Cr III and V IV O is estimated from the molecular field parameter W, obtained by fitting the | M -1 | ) f(T) data in the paramagnetic phase of the compound. The dependence of the T C value is analyzed in relation with the connectivity of the molecular precursor, the stoichiometry of the three-dimensional material, and the nature of the constituting metal ions. The T C value of 1 is compared to that of the high-T C ferrimagnet (315 K) V[Cr(CN) 6 ] 0.86 ‚2.8H 2 O (2); the values of the J parameters are almost the same. This allows us to estimate the T C values for other possible vanadium-chromium ferrimagnets.
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