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Activation of Molecular Oxygen by Biomimetic Schiff Base Complexes of Manganese, Iron, and Cobalt
Author(s) -
Jäger ErnstGottfried,
Knaudt Jutta,
Rudolph Manfred,
Rost Michael
Publication year - 1996
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19961290911
Subject(s) - chemistry , manganese , catalysis , schiff base , medicinal chemistry , cobalt , oxygen , hydroquinone , electrochemistry , metal , lewis acids and bases , inorganic chemistry , stereochemistry , organic chemistry , electrode
The metal complexes ( E,E )‐[{diethyl 2,2′‐[1,2‐phenylenebis(iminomethylidyne)]bis[3‐oxobutanoato]}(2–)‐ N,N′,O 3 ,O 3′ ]manganese (Mn 1a ), [3,3′]‐[1,2‐phenylenebis(iminomethylidyne)bis(2,4‐pentanedionato)(2–)‐ N,N′,O 2 ,O 2′ ]manganese (Mn 1b ), and (Z,Z)‐[diethyl 3,3′‐(1,2‐phenylenediimino)bis(2‐cyano‐2‐propenoato)](2–)‐ N 3 ,N 3′ ,O 1 ,O 1′ ]manganese (Mn 1c ) were sythesised and the oxygenation of these complexes was investigated by gas volumetry. All complexes except Mn 1c are able to take up oxygen but with different magnitudes. The catalytic activity of the Mn, Co, and Fe complexes of the ligands 1a and 1c and ( E,E )‐[{diethyl 2,2′‐[1,2‐ethylenebis(iminomethylidyne)]bis[3‐oxobutanoato]} (2–) N,N′,O 3 ,O 3′ ] iron (Fe 1d ) and [diethyl ( all‐E )‐5,14‐dihydro‐6,17‐dimethyldibenzo[ b,i ][1,4,8,11]tetraazacyclotetradecine‐7,16‐dicarboxylato)(2–)‐ N 5 ,N 9 ,N 14 ,N 18 ]iron (Fe 2a ) has been compared with respect to the oxidation of hydroquinone by molecular oxygen. The results are interpreted with the aid of electrochemical properties, Lewis acidities, and other relevant factors. However, no simple relationship between the catalytic activity and the other factors could be found.