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Syntheses and structures of two new lithium-heptamolybdates
No full text<p>The synthesis, crystal structures, IR, UV–vis, <sup>7</sup>Li NMR spectra, electrochemical investigations, and conductivity studies of two new lithium-heptamolybdates, (NH<sub>4</sub>)<sub>4</sub>[Li<sub>2</sub>(H<sub>2</sub>O)<sub>7</sub>][Mo<sub>7</sub>O<sub>24</sub>]·H<sub>2</sub>O (<b>1</b>) and (NH<sub>4</sub>)<sub>3</sub>[Li<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>(<i>μ</i><sub>6</sub>-Mo<sub>7</sub>O<sub>24</sub>)]·2H<sub>2</sub>O (<b>2</b>), are reported. In <b>1</b> the (NH<sub>4</sub>)<sup>+</sup> and [Li<sub>2</sub>(H<sub>2</sub>O)<sub>7</sub>]<sup>2+</sup>, cations are charge balanced by the heptamolybdate anion. In <b>2</b>, the [Mo<sub>7</sub>O<sub>24</sub>]<sup>6−</sup> anion is coordinated to three unique Li<sup>+</sup> ions via a <i>μ</i><sub>6</sub>-hexadentate-binding mode resulting in the formation of a two-dimensional (2-D) [Li<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>(<i>μ</i><sub>6</sub>-Mo<sub>7</sub>O<sub>24</sub>)]<sup>3−</sup> anionic complex, charge neutralized by three (NH<sub>4</sub>)<sup>+</sup> ions. The cations, anions, and the lattice water molecules in <b>1</b> and <b>2</b> are linked by weak H-bonding interactions.</p
