Although nitrogen was initially thought to be unreactive, this simple diatomic molecule does have interesting chemical properties. Some elements can "burn" in nitrogen, among them magnesium at 300 °C and lithium even at room temperature, producing crystalline metal nitrides. Complexes of molecular nitrogen with transition metals had been predicted for many years, but the first organometallic compound of dinitrogen, [Ru(NH3)5N2]Cl2, was only reported in 1965. Most of the fascinating chemistry of nitrogen is, however, reserved for its inorganic and especially organic compounds, notably amines, nitro compounds, and their more complex relatives.