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https://elib.belstu.by/handle/123456789/36947| Title: | Synthesis, Structures, Electrochemistry, and Catalytic Activity towards Cyclohexanol Oxidation of Mono-, Di-, and Polynuclear Iron(III) Complexes with 3-Amino-2-Pyrazinecarboxylate |
| Authors: | Karmakar, Anirban Luísa M.D.R.S., Martins Yuliya, Yahorava M. Fátima C. Guedes da Silva Armando J. L., Pombeiro |
| Keywords: | Iron(III) complex Crystal structure Electrochemistry Catalysis Oxidation reaction комплексы железа электрохимия окисление циклогексанола кристаллическая структура синтез 3-амино-2-пиразинкарбоновая кислота 3-Amino-2-Pyrazinecarboxylate комплексные соединения железа |
| Issue Date: | 2020 |
| Citation: | Synthesis, Structures, Electrochemistry, and Catalytic Activity towards Cyclohexanol Oxidation of Mono-, Di-, and Polynuclear Iron(III) Complexes with 3-Amino-2-Pyrazinecarboxylate / Anirban Karmakar [et al.] // Applied Sciences. - 2020. - Vol. 10, Iss. 8. - № 2692 |
| Description: | The synthesis and characterization of a set of iron(III) complexes, viz. the mononuclear [Fe(L)3] (1) and [NHEt[3]][Fe(L)[2](Cl)[2]](2), the dinuclear methoxido-bridged [Fe(L)[2](μ-OMe)]2.DMF.1.5MeOH (3), and the heteronuclear Fe(III)/Na(I) two-dimensional coordination polymer [Fe(N[3])(μ-L)[2](μ-O)[1/2](Na)(μ-H[2]O)[1/2]]n(4), are reported. Reactions of 3-amino-2-pyrazinecarboxylic acid (HL) with iron(III) chloride under different reaction conditions were studied, and the obtained compounds were characterized by elemental analysis, Fourier Transform Infrared (FT-IR) spectroscopy, and X-ray single-crystal diffraction. Compound 1 is a neutral mononuclear complex, whereas 2 is mono-anionic with its charge being neutralized by triethylammonium cation. Compounds 3 and 4 display a di-methoxido-bridged dinuclear complex and a two-dimensional heterometallic Fe(III)/Na(I) polynuclear coordination polymer, respectively. Compounds 3 and 4 are the first examples of methoxido- and oxido-bridged iron(III) complexes, respectively, with 3-amino-2-pyrazinecarboxylate ligands. The electrochemical study of these compounds reveals a facile single-electron reversible Fe(III)-to-Fe(II) reduction at a positive potential of 0.08V vs. saturated calomel electrode (SCE), which is in line with their ability to act as efficient oxidants and heterogeneous catalysts for the solvent-free microwave-assisted peroxidative oxidation (with tert-butyl hydroperoxide) of cyclohexanol to cyclohexanone (almost quantitative yields after 1 h). Moreover, the catalysts are easily recovered and reused for five consecutive cycles, maintaining a high activity and selectivity. |
| URI: | https://elib.belstu.by/handle/123456789/36947 |
| Appears in Collections: | Публикации в зарубежных изданиях |
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