Ru–OSO Coordination Photogenerated at 100 K in Tetraammineaqua(sulfur dioxide)ruthenium(II) (±)-Camphorsulfonate

The photoinduced O-bound coordination mode in RuSO₂ complexes, previously observed only at 13 K, has been generated at 100 K in tetraammineaqua­(sulfur dioxide)­ruthenium­(II) (±)-camphorsulfonate. This coordination state, often denoted MS1, decays to the η²-bound MS2 state, with an estimated half-life of 3.4(8) h and a long-lived population of 2.9(4)% at 120 K.