کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1337168 1500288 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Formation of a Cu(II)–phenoxyl radical complex from a Cu(II)–phenolate complex: A new model for galactose oxidase
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Formation of a Cu(II)–phenoxyl radical complex from a Cu(II)–phenolate complex: A new model for galactose oxidase
چکیده انگلیسی

A new N3O type tetradentate ligand (HL) [2,4-di-tert-butyl-6-((4-(2-(6,8-di-tert-butyl-2H-benzo[e][1,3]oxazin-3(4H)-yl)ethyl)piperazin-1-yl)methyl)phenol] and its complex [CuL(CH3OH)]ClO4(CH3OH) have been synthesised. The complex has been crystallographically and spectroscopically characterised. It has been noticed that in the presence of acetonitrile the Cu(II) centers in the complex undergo reduction with a concomitant oxidation of the ligand. EPR and UV–Vis spectroscopic studies of the complex in acetonitrile indicate that this disproportionation proceeds via the formation of a Cu(II)–phenoxyl intermediate. The Cu(II)–phenoxyl complex is found to be stable in methanol in the presence of base. The oxidised products of the ligand are isolated and characterized. The paramagnetic centers in the Cu(II)–phenoxyl complexes were found to be weakly ferromagnetically coupled.

A new N3O type tetradentate ligand (HL) [2,4-di-tert-butyl-6-((4-(2-(6,8-di-tert-butyl-2H-benzo[e][1,3]oxazin-3(4H)-yl)ethyl)piperazin-1-yl)methyl)phenol] and its complex [CuL(CH3OH)]ClO4(CH3OH) have been synthesised. The complex has been crystallographically and spectroscopically characterised. It has been noticed that in the presence of acetonitrile the Cu(II) centers in the complex undergo reduction with a concomitant oxidation of the ligand. EPR and UV–Vis spectroscopic studies of the complex in acetonitrile indicate that this disproportionation proceeds via the formation of a Cu(II)–phenoxyl intermediate. The Cu(II)–phenoxyl complex is found to be stable in methanol in the presence of base. The oxidised products of the ligand are isolated and characterized. The paramagnetic centers in the Cu(II)–phenoxyl complexes were found to be weakly ferromagnetically coupled.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 51, 4 March 2013, Pages 222–227
نویسندگان
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