Templated assembly of metal-anion arrays within layered hosts: synthesis and characterization of new transition-metal oxyhalide perovskites

摘要

Ion exchange of Dion-Jacobson-type double- and triple-layered perovskites with divalent transition-metal halides leads to the templated assembly of metal-anion layers. A whole series of compounds of the form (MCI)LaNb{sub}2O{sub}7 (M = V, Cr, Mn, Fe, Co, Cu) and (CuCl)Ln{sub}2Ti{sub}2NbO{sub}10 (Ln = Pr, Nd, Sm, Eu) have been prepared. Additionally, a new series of host compounds is being developed to exploit this exchange chemistry; the new oxyfluorides, RbLnTiNbO{sub}6F (Ln = La, Pr, Nd) and RbLaM'NbO{sub}6F (M' = V{sup}(4+), Mn{sup}(4+), Nb{sup}(4+), Mo{sup}(4+)), have been prepared by a direct route.