Synthèse et structure cristalline d’un matériau noir AgMnII3(MnIII026Al074)(MoO4)5

摘要

A new silver aluminium trimangan­ese penta­molybdate {silver(I) trimanganese(II) aluminium penta­kis­[tetra­oxidomolybdate(VI)]}, AgMn^II 3(Mn^III 0,26Al0,74)(MoO4)5, has been synthesized using solid-state methods. The structure is composed of M 2O10 dimers, M 3O14 (M = Mn, Al) trimers and MoO4 tetra­hedra sharing corners and forming three types of layers A, B and B′. The sequence of the constituting layers is A–BB′–A–BB′, with B′ obtained from B by inversion symmetry, forming a three-dimensional structure with large channels in which the positionally disordered and partially occupied Ag⁺ ions reside. The Mn^III and Al^III atoms share the same site, M. AgMn^II 3(Mn^III 0,26Al0,74)(MoO4)5 is isotypic with the NaMg3 X(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.