Gold phosphides are inorganic compounds of gold and phosphorus. The only known gold phosphide is a metastable gold(I) polyphosphide with the formula .
Older texts sometimes refer to a binary auric phosphide ; this hypothetical compound has not been verified by modern methods such as X-ray crystallography.
Monoclinic is produced by direct reaction between metallic gold and red phosphorus at high temperatures over multiple days. The reaction produced only , with no other compounds observed across a wide variety of Au:P atom ratios.
Gold(III) phosphide was purportedly prepared by the direct reaction of spongy gold and phosphorus or by passing phosphine into a solution of auric chloride in ether or alcohol:
is claimed to decompose in air or with . It has a monoclinic crystal structure.
A mixed anion phosphide iodide, , is known to possess a trigonal structure.