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Synthesis, Oxygenation and Catalytic Oxidation Performance of Crown Ether‐Containing Schiff Base‐Transition Metal Complexes
Author(s) -
Zeng Wei,
Li Jianzhang,
Mao Zhihua,
Hong Zhou,
Qin Shengying
Publication year - 2004
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200404094
Subject(s) - chemistry , schiff base , crown ether , catalysis , benzaldehyde , moiety , transition metal , selectivity , ether , polymer chemistry , ring size , cobalt , ring (chemistry) , medicinal chemistry , inorganic chemistry , organic chemistry , ion
Mono‐Schiff bases containing a crown ether ring ( HL 1 , HL 2 , HL 3 and HL 4 ) and their transition metal complexes were synthesized and characterized by 1 H NMR, IR, and mass spectroscopy as well as elemental analysis. The oxygenation constants (K O 2) of Schiff base‐Co(II) complexes were measured over the range of −5 to +25 °C, and the values of ΔH° and ΔS° were calculated based on these K O 2values. Using Mn(III)‐Schiff base complexes, the biomimetic catalytic oxidation of styrene to benzaldehyde was carried out with 100% selectivity. Comparison of this complex with analogues not containing a crown ether moiety clearly demonstrated the influence of crown ether ring on the dioxygen affinities and biomimetic catalytic oxidation performance of the Schiff base complexes.