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(a) NRVS spectra for (NH4)2Mg(II)[57Fe(II)(CN)6] (5) (green), K57Fe(II)[Co(III)(CN)6] (3) (purple) and 57Fe(III)4[57Fe(II)(CN)6]3.xH2O (PB) (4) (black); (b) NRVS spectra for K3[Fe(III)(CN)6] (8) (red) and the Fe(II)-CN NRVS peak position for K4[Fe(II)(CN)6] (7) (green bar): the NRVS spectrum for 7 is shown as in Figure S1; (c) partial NRVS spectra for Eu(III)[Fe(III)(CN)6] (2) (red) and KEu(III)[Fe(II)(CN)6] (1) (green) in the characteristic Fe-CN peaks region.
