Reactions of laser-ablated platinum with nitrogen: Matrix infrared spectraof platinum nitride, complexes, and anions

Several new platinum nitride species are produced by the reaction of laser- ablated platinum with pure nitrogen, and their frequencies calculated by de nsity functional theory in addition to the complexes observed in earlier th ermal atom studies. Platinum forms PtN and a number of molecules derived fr om PtN including NNPtN, PtPtN, Pt2N, and PtNNPt, and PtNNN from reaction wi th N-3 radical in pure nitrogen. The PtNN complex is characterized by the P t-N stretching mode at 499.6 cm(-1) and its combination band at 2669.6 cm(- 1) with the strong N-N fundamental at 2168.5 cm(-1) in solid argon. Absorpt ions are observed for PtxNN, PtNN-, Pt(NN)(2)(-), and Pt(NN)(2) in solid ar gon and neon.