Synthèse et structure cristalline d’un matériau noir AgMn(II) (3)(Mn(III) (0,26)Al(0,74))(MoO(4))(5)

A new silver aluminium trimangan­ese penta­molybdate {silver(I) trimanganese(II) aluminium penta­kis­[tetra­oxidomolybdate(VI)]}, AgMn(II) (3)(Mn(III) (0,26)Al(0,74))(MoO(4))(5), has been synthesized using solid-state methods. The structure is composed of M (2)O(10) dimers, M (3)O(14) (M = Mn, Al) trimers and MoO(4) 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) (0,26)Al(0,74))(MoO(4))(5) is isotypic with the NaMg(3) X(MoO(4))(5) (X = Al, In) family and with NaFe(4)(MoO(4))(5). A comparative structural description is provided between the structure of the title compound and those of related phases containing dimers, trimers and tetra­mers.