Synthesis and Crystal Structure of Two Decavanadates Cluster Metal Complexes: [Co(H2O)6]2[H2V10O28]·6H2O and (NH4)2[Ca(H2O)7]2[V10O28]

Two new decavanadate metal complexes, [Co(H2O)6]2[H2V10O28]·6H2O (1) and (NH4)2[Ca(H2O)7]2[V10O28] (2), have been synthesized under hydrothermal condition by using chlorhydric acid as the initiator at 120 °C. The aqueous NaVO3 solution with an aqueous solution of CoCl2·6H2O were used for generating 1 and aqueous CaCl2·2H2O and NH4VO3 solution were employed for creating 2. Compound 1 consisted of discrete hexa-aqua-cobalt [Co(H2O)6]2+ cations, [H2V10O28]4− anions and non-coordination water molecules. Compound 2 were composed of hepta-aqua-calcium [Ca(H2O)7]2+ cations, ammonium NH4+ and [V10O28]6− anion. For compound 2, the distorted pentagonal bipyramid [Ca(H2O)7]2+ is uncommon. In the crystal lattice, hydrogen bonds played an important role on connecting cations, anions and non-coordinated water molecules to form the three-dimensional network.