Okay kiddo, imagine you have a toy car that can fit two passengers. Now think of this car as a metal atom, like iron or nickel, which can carry two special passengers called nitrogen atoms. When the metal atom is carrying these two nitrogen passengers, we call it a transition metal dinitrogen complex.
Now, these nitrogen atoms are very picky about who they ride with. They only like to ride with certain metal atoms because they need a stable environment to stay in. When the metal atom and nitrogen atoms are together, they form a special bond that holds them tightly together. We call this bond a chemical bond.
This transition metal dinitrogen complex is very useful because it can help us make things like fertilizers and fuel. Scientists are also studying how to use these complexes to help clean up pollution in the environment.
So, the takeaway here is that a transition metal dinitrogen complex is like a car carrying two special passengers (nitrogen atoms) and it forms a strong bond that can be useful in making things we need and helping the environment.