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• Description

  A compound characterized by the presence in its structure of the O2− ion. The O2− ion has an odd number of electrons (17) and as a result all superoxide compounds are paramagnetic. At room temperature they have a yellowish color. At low temperature many of them undergo reversible phase transitions accompanied by a color change to white. The stable superoxides are
  sodium superoxide NaO2
  potassium superoxide KO2
  rubidium superoxide RbO2
  cesium superoxide CsO2
  calcium superoxide Ca(O2)2
  strontium superoxide Sr(O2)2
  barium superoxide Ba(O2)2
  tetramethylammonium superoxide (CH3)4NO2
  In these compounds each oxygen atom has an oxidation number of −1/2 instead of −2, as a normal oxide. ;

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