Synthèse et structure cristalline d'un matériau noir AgMnII3(MnIII0,26Al0,74)(MoO4)5

Abstract

A new silver aluminium trimanganese pentamolybdate {silver(I) trimanganese(II) aluminium pentakis[tetraoxidomolybdate(VI)]}, AgMnII3(MnIII0,26Al0,74)(MoO4)5, has been synthesized using solid-state methods. The structure is composed ofM2O10dimers,M3O14(M= Mn, Al) trimers and MoO4tetrahedra sharing corners and forming three types of layersA,BandB′. The sequence of the constituting layers isA–BB′–A–BB′, withB′ obtained fromBby inversion symmetry, forming a three-dimensional structure with large channels in which the positionally disordered and partially occupied Ag+ions reside. The MnIIIand AlIIIatoms share the same site,M. AgMnII3(MnIII0,26Al0,74)(MoO4)5is isotypic with the NaMg3X(MoO4)5(X= Al, In) family and with NaFe4(MoO4)5. A comparative structural description is provided between the structure of the title compound and those of related phases containing dimers, trimers and tetramers.