The synthetic cobalt vanadium selenite, Co(2)V(2)Se(2)O(11)

The crystal structure of dicobalt(II) divanadium(V) disel­enium(IV) undeca­oxide, Co(2)V(2)Se(2)O(11), exhibits a three-dimensional framework, the building units being distorted CoO(6) octa­hedra and VO(5) square pyramids arranged so as to form alternate chains along [010]. The framework has channels along [100] and [010] in which the two Ψ-SeO(3) E (site symmetries m; E being the 4s (2) lone electron pair of Se(IV)) tetra­hedra reside and connect to the other building blocks. The structure contains corner- and edge-sharing CoO(6) octa­hedra, corner- and edge-sharing VO(5) square pyramids and edge-sharing Ψ-SeO(3) E tetra­hedra. Co(2)V(2)Se(2)O(11) is the first oxide containing all the cations Co(II), V(V) and Se(IV).