Vanadium tetrachloride

Vanadium Tetrachloride

Vanadium tetrachloride

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Description:
Vanadium tetrachloride is the inorganic compound with the formula V<sub>4</sub>. This bright red liquid is a useful reagent for the preparation of other vanadium compounds.

Synthesis, bonding, basic properties

With one more valence electron than diamagnetic TiCl<sub>4</sub>, VCl<sub>4</sub> is a paramagnetic liquid. It is one of only a few paramagnetic compounds that is liquid at room temperature.

VCl<sub>4</sub> is prepared by chlorination of vanadium metal. VCl<sub>5</sub> does not form; Cl<sub>2</sub> lacks the oxidizing power to attack VCl<sub>4</sub>. In contrast, the heavier analogues NbCl<sub>5</sub> and TaCl<sub>5</sub> are stable and not particularly oxidizing. Of course, VF<sub>5</sub> does exist, reflecting the increased oxidizing power of F<sub>2</sub> vs Cl<sub>2</sub>. Indicative of its oxidizing power, VCl<sub>4</sub> releases Cl<sub>2</sub> at its boiling point (standard pressure) to afford vanadium chloride.

Reactions

Consistent with its high oxidizing power, VCl<sub>4</sub> reacts with HBr at -50 °C to produce VBr<sub>3</sub>. The reaction proceeds via VBr<sub>4</sub>, which releases Br<sub>2</sub> during warming to room temperature.
: 2 VCl<sub>4</sub> + 8 HBr → 2 VBr<sub>3</sub> + 8......
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