Manganese chlorins immobilized on silica as oxidation reaction catalysts

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:450

Article

Castro, Kelly A. D. F.^1,2,3  Pires, Sonia M. G.^2,3  Ribeiro, Marcos A.¹  Simoes, Mario M. Q.^2,3  Neves, M. Graca P. M. S.^2,3  Schreiner, Wido H.¹  Wypych, Fernando¹  Cavaleiro, Jose A. S.^2,3  Nakagaki, Shirley¹ 

[1] Univ Fed Parana UFPR, Lab Bioinorgan & Catalise, BR-81531980 Curitiba, Parana, Brazil

[2] Univ Aveiro, Dept Chem, P-3810193 Aveiro, Portugal

[3] Univ Aveiro, QOPNA, P-3810193 Aveiro, Portugal

关键词: Chlorins;    Porphyrins;    Immobilization;    Sol-gel;    Heterogeneous catalysis;    Oxidation;   

DOI  :  10.1016/j.jcis.2015.03.028

来源: Elsevier

【 摘 要 】

Synthetic strategies that comply with the principles of green chemistry represent a challenge: they will enable chemists to conduct reactions that maximize the yield of products with commercial interest while minimizing by-products formation. The search for catalysts that promote the selective oxidation of organic compounds under mild and environmentally friendly conditions constitutes one of the most important quests of organic chemistry. In this context, metalloporphyrins and analogues are excellent catalysts for oxidative transformations under mild conditions. In fact, their reduced derivatives chlorins are also able to catalyze organic compounds oxidation effectively, although they have been still little explored. In this study, we synthesized two chlorins through porphyrin cycloaddition reactions with 1.3-dipoles and prepared the corresponding manganese chlorins (MnCHL) using adequate manganese(II) salts. These MnCHL were posteriorly immobilized on silica by following the sol-gel process and the resulting solids were characterized by powder X-ray diffraction (PXRD), UVVIS spectroscopy, FTIR, XPS, and EDS. The catalytic activity of the immobilized MnCHL was investigated in the oxidation of cyclooctene, cyclohexene and cyclohexane and the results were compared with the ones obtained under homogeneous conditions. (C) 2015 Elsevier Inc. All rights reserved.

【 授权许可】

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