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Pentacarbonylhydridorhenium

Pentacarbonylhydridorhenium is a chemical compound with the formula ReH(CO)<sub>5</sub>. This colorless liquid is a weak acid and represents one of the most important derivatives of dirhenium decacarbonyl (Re<sub>2</sub>(CO)<sub>10</sub>). It is synthesized by treating a methanolic solution of bromopentacarbonylrhenium(I) (Re(CO)<sub>5</sub>Br) with zinc and acetic acid (HOAc).

Re(CO)<sub>5</sub>Br + Zn + HOAc → ReH(CO)<sub>5</sub> + ZnBrOAc

It is moderately sensitive to light: samples turn yellow due to the formation of the metal cluster Re<sub>3</sub>H(CO)<sub>14</sub>

3 Re(CO)<sub>5</sub>H → Re<sub>3</sub>H(CO)<sub>14</sub> + H<sub>2</sub> + CO

At 100&nbsp;°C, it decomposes to Re<sub>2</sub>(CO)<sub>10</sub>:

2 Re(CO)<sub>5</sub>H → H<sub>2</sub> + Re<sub>2</sub>(CO)<sub>10</sub>

References