Synthesis of manganese oxidation catalyst

Abstract

A process is described for the preparation of a compound having the formula: ##STR1## wherein Mn is manganese in a III or IV oxidation state; X is independently selected from a coordinating or bridging species selected from the group consisting of: H.sub.2 O, O.sub.2.sup.2-, O.sub.2-, OH.sup.-, HO.sub.2.sup.-, SH.sup.-, S.sup.2-, SO, Cl.sup.-, N.sub.3.sup.-, SCN.sup.-, N.sup.3-, HCOO.sup.-, NH.sub.2.sup.- and NH.sub.3 ; L is an organic ligand that is at least a nine-membered ring wherein at least two nitrogen atoms form part of the ring and coordinate with the Mn; z is an integer ranging from -4 to +4; Y is a monovalent or multivalent counterion leading to charge neutrality selected from the group consisting of halides, sulphates, sulphonates, nitrates, boron and phosphorus salt counterions; and q is an integer from 1 to 4; the process comprising the steps of: (i) reacting in an aqueous medium a manganese (II) salt with the ligand L to form a manganese coordinated substance, a counterion salt M.sub.z Y.sub.q being present wherein M is selected from the group consisting of metallic and ammonium ions; and (ii) oxidizing the manganese coordinated substance with an oxidizing agent while simultaneously maintaining a pH of at least 12 to thereby form the compound.

Dependencies are inferred from the claim text.