superoxiden.

1807 A. Aikin & C. R. Aikin Dict. Chem. & Mineral. II. 422/2 It is therefore properly a muriated sub-oxyd of tin; and we shall at present give it this term, to distinguish it from another muriat in which the tin is in a high state of oxydation, and which we may term muriated super-oxyd.

1833 E. Turner Elements Chem. (ed. 4) 582 A third [oxide of copper]..I will designate by the name of superoxide: it contains twice as much oxygen as the black oxide.

1865 Boston Med. & Surg. Jrnl. 71 154 Schönbein..enumerates the ozonides; they are the superoxides of Mn, Pb, Ni, Co, Bi, Ag, and also..chromic, permanganic and tanadic [read vanadic] acids.

1901 A. B. Prescott & O. C. Johnson Qualitative Chem. Anal. 223 Potassium superoxide, K₂O₄, is formed when K is heated in contact with abundance of air.

1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. xiii. 491 The metal oxides so far discussed contain the anion O²⁻ only. There are also two other series of oxides, the peroxides and superoxides, which contain the anions O₂²⁻ and O₂⁻ respectively.

1979 Experientia 35 245/2 The explanation for such action is the hypothesis that vitamin C can act as an antoxidant as well as oxidant, by generating superoxide.

1994 M. B. McBride Environmental Chem. Soils vii. 257 The superoxide ion is a moderately effective reducing agent, but a poor oxidizing agent.