Synthesis, characterization and structure of (NH4)4[Zn5V IV4V V16O56H2(H2O)4] with a novel V5O14 layer†
A novel zinc vanadate (NH4)4[Zn5VIV4VV16O56H2(H2O)4] was synthesized by the hydrothermal method and a zinc–vanadium–water system without any organic media was studied for the first time. The pH and the reaction time play important roles in the formation of the final products and the structure-change of the different products was also discussed. The new phase (NH4)4[Zn5VIV4VV16O56H2(H2O)4] is a three-dimensional structure with a novel V5O14 layer connected by ZnO4 and ZnO6 polyhedra. The V5O14 layer in (NH4)4[Zn5VIV4VV16O56H2(H2O)4] was constructed with four distorted VO5 square pyramids and one regular VO4 triangular pyramid which is different from the reported ones due to the pure inorganic mild synthesis conditions.