Catalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism.
Density functional theory reveals the detailed mechanism of alcohol oxidation by a model copper complex, Cu(II)L, L = cis-1-(3',5'-dimethoxy-benzylideneamino)-3,5-[2-hydroxy-(3',5'-di-tert-butyl)benzylideneimino]cyclohexane. Despite the obvious structural and functional parallels...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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2006
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| _version_ | 1797083985506992128 |
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| author | Zueva, E Walton, P McGrady, J |
| author_facet | Zueva, E Walton, P McGrady, J |
| author_sort | Zueva, E |
| collection | OXFORD |
| description | Density functional theory reveals the detailed mechanism of alcohol oxidation by a model copper complex, Cu(II)L, L = cis-1-(3',5'-dimethoxy-benzylideneamino)-3,5-[2-hydroxy-(3',5'-di-tert-butyl)benzylideneimino]cyclohexane. Despite the obvious structural and functional parallels between the title compound and the enzyme galactose oxidase, the details of the catalytic pathway are fundamentally different. In the enzyme, coordination of the substrate produces an active form containing a Cu(II) centre and a tyrosyl radical, the latter being responsible for the abstraction of hydrogen from the substrate. In the model system, in marked contrast, the active form contains a Cu(II) centre, but the ligand radical character is localised on the substrate (alcoholate) oxygen, rather than the phenolate ligand. The result is a significantly higher barrier to hydrogen-atom abstraction compared to the enzyme itself. The origin of these significant differences is traced to the rigid nature of the pentadentate ligand, which resists changes in coordination number during the catalytic cycle. |
| first_indexed | 2024-03-07T01:49:15Z |
| format | Journal article |
| id | oxford-uuid:9980791f-78e7-468a-b7ee-bb27720e16e4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:49:15Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:9980791f-78e7-468a-b7ee-bb27720e16e42022-03-27T00:14:44ZCatalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9980791f-78e7-468a-b7ee-bb27720e16e4EnglishSymplectic Elements at Oxford2006Zueva, EWalton, PMcGrady, JDensity functional theory reveals the detailed mechanism of alcohol oxidation by a model copper complex, Cu(II)L, L = cis-1-(3',5'-dimethoxy-benzylideneamino)-3,5-[2-hydroxy-(3',5'-di-tert-butyl)benzylideneimino]cyclohexane. Despite the obvious structural and functional parallels between the title compound and the enzyme galactose oxidase, the details of the catalytic pathway are fundamentally different. In the enzyme, coordination of the substrate produces an active form containing a Cu(II) centre and a tyrosyl radical, the latter being responsible for the abstraction of hydrogen from the substrate. In the model system, in marked contrast, the active form contains a Cu(II) centre, but the ligand radical character is localised on the substrate (alcoholate) oxygen, rather than the phenolate ligand. The result is a significantly higher barrier to hydrogen-atom abstraction compared to the enzyme itself. The origin of these significant differences is traced to the rigid nature of the pentadentate ligand, which resists changes in coordination number during the catalytic cycle. |
| spellingShingle | Zueva, E Walton, P McGrady, J Catalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism. |
| title | Catalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism. |
| title_full | Catalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism. |
| title_fullStr | Catalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism. |
| title_full_unstemmed | Catalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism. |
| title_short | Catalytic alcohol oxidation by an unsymmetrical 5-coordinate copper complex: electronic structure and mechanism. |
| title_sort | catalytic alcohol oxidation by an unsymmetrical 5 coordinate copper complex electronic structure and mechanism |
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