Synthesis and characterization of binuclear Co(II) complexes with bis(salen-type) ligands

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• 作者：Minna T. Rä ; isä ; nen^a ; ^{minna.t.raisanen@helsinki.fi} ; Heikki Korpi^a ; Markku R. Sundberg^a ; Alexander Savin^b ; Markku Leskelä ; ^a ; Timo Repo^a ; ^{timo.repo@helsinki.fi}
• 关键词：Binuclear Co(II) Schiff bases ; Molecular modeling ; O&ndash ; O Activation ; Alcohol oxidation
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：394
• 期：Complete
• 页码：203-209
• 全文大小：544 K

文摘

Two new, bridged bis(salen-type) ligand precursors, 1,1,3,3-tetrakis(salicylidene-3-iminopropyl)butylenediamine (I) and 1,1,3,3-tetra(salicylideneiminomethyl)propane (IV), were prepared by Schiff base condensation of salicylaldehyde with appropriate tetraamines. Corresponding binuclear Co(II) complexes 1 and 2 were obtained with moderate yields and the complexes were characterized in detail. Structural optimizations of the complexes were carried out at the B3LYP/6-311G^? level of theory. Dioxygen coordination abilities of 1 and 2 were studied experimentally by UV-Vis spectroscopy and compared with traditional N,N¡ä-ethylenebis(salicylideniminato)Co(II), Co(salen) (3). In addition, catalytic activities of 1 and 2 in comparison with various mononuclear salen-type Co complexes (3-7) were studied in the oxidation of 3,4-dimethoxybenzyl alcohol (veratryl alcohol) in alkaline aqueous solutions.