Okay kiddo, so you know how some things are made up of tiny little parts called atoms? Well, when certain atoms - like metal and phosphorous - come together and stick to each other, they can form something called a metal phosphine complex.
Think of it like building with LEGO bricks. You can take a red brick and a yellow brick and connect them together to make a new structure, right? Well, in the same way, when metal and phosphorous atoms come together, they form a new thing that has a different structure and properties than the individual atoms had by themselves.
A metal phosphine complex is special because it has metal atoms surrounded by a special type of molecule called a phosphine. This phosphine molecule has one phosphorous atom and three other atoms connected to it. This group of atoms helps hold onto the metal atom, so they stick together really well.
These metal phosphine complexes can be really useful because they can do some cool things. For example, they can act like tiny magnets, or they can help make chemical reactions happen faster. Scientists can even use metal phosphine complexes to drive chemical reactions in specific ways, kind of like steering a car.
So, to sum up: a metal phosphine complex is a special type of molecule made up of metal atoms and a molecule called phosphine. It can have special properties and be used for all sorts of things by scientists.