Electrophilic Substitution Mn(II) → M(II) (M = Co, Ni, Cu, Zn, Cd) in Gelatin-Immobilized Mn2[Fe(CN)6]

Reactions of electrophilic substitution Mn(II) → M(II) (M = Co, Ni, Cu, Zn, Cd) are studied in gelatin-immobilized Mn(II) hexacyanoferrate(II) systems brought in contact with aqueous solutions of metal chlorides MCl2. As the result of this contact, Mn(II) is replaced by Co(II), Ni(II), Cu(II), Zn(II), or Cd(II) to give heteronuclear metal hexacyanoferrates(II) (MHCF) of Mn(II) and two-charged ions. Neither of the systems under study showed a complete substitution of Mn(II) or the formation of the respective mononuclear hexacyanoferrate(II) M2[Fe(CN)6]. When any of the above gelatin-immobilized MHCF was brought in contact with an aqueous solution of MnCl2, no electrophilic substitution M(II) → Mn(II) was observed even for a long contact time.