Pentacarbonylhydridorhenium

Pentacarbonylhydridorhenium is a chemical compound with the formula ReH(CO)5. This colorless liquid is a weak acid and represents one of the most important derivatives of Re2(CO)10. It is synthesized by treating a methanolic solution of Re(CO)5Br with zinc and acetic acid.
 * Re(CO)5Br + Zn + HO2CCH3 →   ReH(CO)5  +  ZnBrO2CCH3)

It is moderately sensitivite to light: samples turn yellow due to the formation of the metal cluster Re3H(CO)14
 * 3 Re(CO)5H →  Re3H(CO)14 + H2 + CO

At 100 °C, it decomposes to Re2(CO)10:
 * 2 Re(CO)5H &rarr; H2 + Re2(CO)10