So, you know how gold is a really valuable metal? Well, scientists figured out a way to make gold even cooler by mixing it with a special chemical called phosphine. When they mix gold with phosphine, it forms a new substance called a "gold phosphine complex."
This complex is kind of like a superpower for gold. It can do things that regular gold can't do, like dissolve in water or react with other chemicals in really cool ways. Scientists like to use this complex to make all sorts of fancy materials and chemicals that they can't make with regular gold.
It's kind of like when you mix water with food coloring. The water gets a special power to turn colors! Except instead of food coloring, scientists are using phosphine to give gold new powers.