期刊
INORGANICA CHIMICA ACTA
卷 365, 期 1, 页码 318-324出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2010.09.036
关键词
Manganese(III); Schiff-base rearrangement; X-ray structure; Catalytic activity; Epoxidation
资金
- CSIR, India [09/028 (0663)/2006-EMR-I, 09/028(0733)/2008-EMR-I]
An attempt for the synthesis of a Mn-III complex with unsymmetrical tetradentate Schiff base ligand uspen (1:1:1 condensate of salicylaldehyde, 2,4-pentanedione and 1,2-ethanediamine) resulted in the isolation of a novel complex, {[{Mn(salen)}{Mn(uspen)}(HCOO)]center dot ClO4}(n) (1) as an intermediate species that contains both the unsymmetrical and symmetrical tetradentate ligand uspen and salen (2:1 condensate of salicylaldehyde and 1,2-ethanediamine) respectively. The structure of the complex shows that half of the unsymmetrical Schiff base, uspen rearranged to its symmetrical analogue, salen. A phenoxo bridged dinuclear Mn-III complex [Mn(salen)(sal)](2)center dot 2H(2)O (2) with only the symmetrical Schiff base was also obtained. Compound 1 that contains both unsymmetrical and symmetrical Schiff base ligands in one molecule is unprecedented and provides an insight into the unsymmetrical to symmetrical rearrangement of tetradentate Schiff base ligand. Complex 2 acts as an efficient catalyst in the alkene ((E)-stilbene, styrene) epoxidation reaction in presence of two terminal oxidants PhIO and NaOCl in solvents CH3CN and CH2Cl2 independently and it retains its reactivity with high efficiency for a long time. (C) 2010 Elsevier B. V. All rights reserved.
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