Copper hydride is a binary compound of hydrogen and copper

Copper

Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...

. The Cu-H bond is weak and therefore the compound when formed is unstable. The reaction of copper(II) sulfate and sodium hypophosphite

Sodium hypophosphite

Sodium hypophosphite is the sodium salt of hypophosphorous acid and is often encountered as the monohydrate, NaPO2H2·H2O. It is a solid at room temperature, appearing as odorless white crystals...

 with some sulfuric acid

Sulfuric acid

Sulfuric acid is a strong mineral acid with the molecular formula . Its historical name is oil of vitriol. Pure sulfuric acid is a highly corrosive, colorless, viscous liquid. The salts of sulfuric acid are called sulfates...

 gives a red-colored precipitate. By heating the precipitate it decomposes to metallic copper and hydrogen gas. The X-ray structure has been reported. As the triphenyl phosphine adduct called Stryker's reagent

Stryker's reagent

Stryker's reagent Stryker's reagent Stryker's reagent ([(PPh3)CuH]6, also known as the Osborn complex, is a hexameric copper hydride ligated with triphenylphosphine. It is a brick red crystalline solid that is very sensitive to air...

it is a reagent in organic chemistry.