Laser-ablated niobium, tantalum, and rhenium atoms have been reacted with nitrogen atoms and molecules during condensation in excess argon and in pure nitrogen gas. Metal nitride molecules NbN, TaN, ReN, and their dinitrogen complexes were trapped and identified by nitrogen isotopic shifts and DFT frequency calculations. The NbN2 and TaN2 dinitride molecules were produced on annealing in solid nitrogen and on deposition and increased on photolysis in solid argon. Metal dinitrogen complexes were also observed for each metal.