Formation of superoxide anion on aerial oxidation of Cu(II)-porphyrinogen in the synthesis of tetrakis(cyclohexyl)porphyrinogenCu(III) anion.
Tetraethylammonium-tetrakis(cyclohexyl)porphyrinogenCu(II) (1) is spontaneously oxidized by aerial oxygen to the corresponding Cu(III) (2) species, producing 1 equiv of O2(-). Steric crowding of the peripheral hydrogens in 1 prevented any direct Cu-O2 bond formation in the oxidation process, which suggests an outer-sphere electron transfer reaction.
Bhattacharya
Dibyendu
D
Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, India.
Maji
Suman
S
Pal
Kuntal
K
Sarkar
Sabyasachi
S
D003300:Copper / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D011165:Porphyrinogens / Q000737:chemistry*; D013481:Superoxides / Q000138:chemical synthesis / Q000737:chemistry*
D011165:Porphyrinogens; D013481:Superoxides; D003300:Copper; D010100:Oxygen