New layered manganese oxide halides

Abstract

The first layered manganese(III) oxide chlorides, Sr₂MnO₃Cl and Sr₄Mn₃O_8−yCl₂, have been synthesised; Sr₂MnO₃Cl adopts a K₂NiF₄ type structure with sheets of MnO₅ square based pyramids linked through oxygen and separated by SrCl layers; it is the end member of a new family of Ruddlesden–Popper type manganese oxide halides which includes the three-layer member Sr₄Mn₃O_8−yCl₂ also reported herein.