M3[Fe(CN(2]2 (M = Mn, Co, Ni, Cu, Zn), Sn9Fe(CN(6], KFe[Fe(CN)6],K2Co[Fe(CN)6)], M1[Fe(CN)6] (M1 = Cr, Fe), Ag3[Fe(CN)6], and La[Fe(CN)6] may be considered as a multibond activation model of bimetal coordination, since CN- acts as a typical ambident ligand bonded at the 2 ends with 2 metal ions. In accordance with hydrogenation reactions of CN- taking place during thermal decomposition in H, the activation effect of bimetal coordination and the mechanism of hydrogenation reaction of CN- are discussed from the viewpoint of the crystal structure and of the electronic structure of the complexes. The activation degree of CN- bonded with various metal ions was studied. The temperature at which the triple bond of CN- breaks with top speed to evolve NH3 correlates closely with the standard electrode potential and d electron configuration of the metal ions.

Key words: REACTION MECHANISM, GAS CHROMATOGRAPHY, CRYSTAL STRUCTURE, HYDROGENATION, THERMAL STABILITY, IRON BLUE, ELECTRONIC STRUCTURE, CYANO COMPLEX, DUAL METAL REFORMING CATALYST, COORDINATE CHEMISTRY