Hydrothermal synthesis and crystal structure of the novel mixed Mo/V metal-oxygen cluster compound [Co(C<sub>2</sub>N<sub>2</sub>H<sub>8</sub>) <sub>3</sub>]<sub>4</sub>[Mo<sup>V</sup><sub>2</sub>Mo<sup>VI</sup> <sub>14</sub>V<sup>IV</sup><sub>16</sub>O<sub>80</sub>(PO<sub>4</sub>) <sub>2</sub>]·10H<sub>2</sub>O containing the two types of typical heteropoly anions - 指纹