Synthesis, Crystal Structures and Catalysis of Dinuclear Cd(Ⅱ) Complexes Bridged by Unusual (N,O,O′)-Coordinated α-Amino Acids

Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (1): 73-78.

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Synthesis, Crystal Structures and Catalysis of Dinuclear Cd(Ⅱ) Complexes Bridged by Unusual (N,O,O′)-Coordinated α-Amino Acids

DENG Dong-sheng^1,2, WANG Li^1*, PEI Ya-mei¹, FENG Lu², LIU Chang-lin¹

1. Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, School of Chemistry, Central China Normal University, Wuhan 430079, P. R. China;
2. College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471022, P. R. China

Received:2011-02-25 Revised:2011-03-24 Online:2012-01-25 Published:2011-12-27
Contact: Li Wang E-mail:wl_928@mail.ccnu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21001047) and the Self-determined Research Funds of Central China Normal University from the Colleges' Basic Research and Operation of Ministry of Education, China(No. CCNU10A01010).

Abstract

Abstract: Four dinuclear amino acid cadmium(Ⅱ) complexes [Cd₂(tren)₂(dl-alaninato)](ClO₄)₃·H₂O(Ⅰ), [Cd₂(tren)₂·(l-alaninato)](ClO₄)₃·H₂O(Ⅱ), [Cd₂(tren)₂(dl-phenylalaninato)](ClO₄)₃(Ⅲ) and [Cd₂(tren)₂(l-phenylalaninato)]· (ClO₄)₃(Ⅳ), constructed from mixed ligands of tris(2-aminoethyl)amine(tren) and racemic or natural amino acids( amino acids=dl- or l-alanine, and dl- or l-phenylalanine), have been synthesized and characterized by X-ray crystallography. The structural analysis of complexes Ⅰ and Ⅲ reveals that the cadmium centers are coordinated by one tren ligand and one amino acid molecule with the unusual (N,O,O′)-bridged mode, resulting in asymmetric chromophores of CdN₄O and CdN₅O in complex Ⅰ, CdN₄O₂ and CdN₅O in complex Ⅲ, respectively. The utility of the four complexes as efficient water-compatible Lewis acid catalysts for the direct aldol reaction in water was examined. The reaction proceeded smoothly to afford the corresponding β-hydroxy ketones in up to 99% yield. Moreover, the diastereoselectivity of the reaction favors the formation of the syn-isomers.

Key words: Dinuclear cadmium(Ⅱ) complex, Amino acid, Aldol reaction

DENG Dong-sheng, WANG Li, PEI Ya-mei, FENG Lu, LIU Chang-lin. Synthesis, Crystal Structures and Catalysis of Dinuclear Cd(Ⅱ) Complexes Bridged by Unusual (N,O,O′)-Coordinated α-Amino Acids[J]. Chemical Research in Chinese Universities, 2012, 28(1): 73-78.

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Synthesis, Crystal Structures and Catalysis of Dinuclear Cd(Ⅱ) Complexes Bridged by Unusual (N,O,O′)-Coordinated α-Amino Acids

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