Scandium monoxide - dinitrogen complexes-OSc(N-2), OScNN, and OScNN+-have been prepared by the reactions of laser-evaporated scandium monoxide with N2 or scandium atoms with NO in solid argon. The ground-state scandium monoxide molecule reacted with N2 to form the side-bonded OSc(N-2) complex spontaneously on annealing. This complex rearranged to the end-on bonded OScNN complex upon UV irradiation. Both the OSc(N2) and OScNN complexes in solid argon can be assigned to have (2)A" electronic ground state with C, symmetry arising from the 2 A first excited-state ScO. The neutral complexes can also be photoionized to the OScNN+ cation complex upon UV irradiation.