Abstract
The title compound, tripotassium iron(III) bis(orthomolybdate) dimolybdate, was obtained by a solid-state reaction. The main structural building units are one FeO
6
octahedron, two MoO
4
tetrahedra and one Mo
2
O
7
dimolybdate group, all with point group symmetries
m
. These units are linked
via
corner-sharing to form ribbons parallel to [010]. The three K
+
cations are located between the ribbons on mirror planes and have coordination numbers of 10 and 12. Two O atoms of one of the MoO
4
tetrahedra of the dimolybdate group are disordered over two positions in a 0.524 (11):0.476 (11) ratio. The structure of the title compound is compared briefly with that of Rb
3
FeMo
4
O
15
.