Synthèse et caractérisation de nouveaux complexes de métaux de transition: Les analogues de bleu de Prusse

Abstract

This work aims at the synthesis of complex ferricyanides transition metals (copper, cobalt, nickel, manganese, and cadmium) by sonochemical method and characterization of these complexes by spectroscopic technique (FTIR), diffraction x-ray (XRD) and scanning electron microscopy (SEM). The characterization of these samples by (IR) states affirms the presence of two types of binding iron-cyanide, Fe III–CN and Fe II–CN in complexes Cd3 [Fe (CN) 6] 2. x H2O, Ni3 [Fe (CN) 6] 2. x H2O and Mn3 [Fe (CN) 6] 2. x H2O, from the redox process, which is not the case for complexes Co3 [Fe (CN) 6] 2. x H2O and Cu3 [Fe (CN) 6] 2. x H2O Where we see only one type of iron binding cyanide Fe III-CN. The analysis by X-ray diffraction shows that our complex ferricyanides transition metals (Cd, Mn, Co, Ni, Cu) are polycrystalline. The indexing phase Cd3 [Fe (CN) 6] 2. x H2O and Mn3 [Fe (CN) 6].x H2O, by the program DICVOL06 shows that they are iso-structural and crystallize in the cubic system with lattice parameter a = 10.6628 (Å), a = 10.5072 (Å ), respectively, which corresponds exactly to the bibliography and the identification of three phases ferricyanides copper, cobalt and nickel was made with the data base powder diffraction PDF/2. Analysis by scanning electron microscopy confirms the homogeneity and polycrystallinity of these complexes wich size is between 0.7 μm and 3 μm. SEM image of Mn3 [Fe (CN) 6].x H2O shows crystallites of cubic shape with sizes between 0.73 μm and 1.32 μm, which is already established by XRD.