Peroxy Compounds of Transition Metals

TLDR: In this paper, the authors describe different types of peroxide in transition metal peroxides and the properties of the peroxide linked to the metal by directed bonds and are closely related to the oxygenated O2-carrying complexes.

Abstract: Publisher Summary This chapter describes different types of peroxide. The solid hydrated peroxides of elements such as copper, praseodymium, or cerium may well contain O2–ions: the only roughly stoichiametric peroxides of thorium and plutonium represent a slightly different class of compound, but may still be essentially ionic. The peroxides of transition metals either in complexes or in high oxidation states (or in both), however, contain peroxide linked to the metal by directed bonds, and are closely related to the oxygenated O2-carrying complexes. The characteristic and interesting properties of transition metal complexes are largely associated with compounds of the last two classes. Most of the known transition metal peroxides have been obtained by the action of H2O2 on some derivative of the metal; in aqueous solution, the proportion of peroxide in the product increases with increasing pH, though this may not be true in solvents other than water. Peroxides of rhenium and cobalt, and of course the oxygenated O2-carrying species containing iron, iridium, or copper, have been made from O2 instead of H2O2; there is evidence that peroxy derivatives of uranium have been obtained by heating compounds of uranium in air, while peroxides are often postulated as unstable intermediates in the oxidation by air of such species as chromium.