Unexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanorings
Strapped or "basket-handle" porphyrins have been investigated previously as hemoglobin mimics and catalysts. The facial selectivity of their interactions with axial ligands is a sensitive test for noncovalent bonding. Here the binding of pyridyl ligands to zinc porphyrins with thioester-li...
| Asıl Yazarlar: | , , , , , , , |
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| Materyal Türü: | Journal article |
| Dil: | English |
| Baskı/Yayın Bilgisi: |
American Chemical Society
2017
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| _version_ | 1826290857837330432 |
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| author | Roche, C Luo, Q Gil-Ramírez, G Jiang, H Kohn, D Xiong, Y Thompson, A Anderson, H |
| author_facet | Roche, C Luo, Q Gil-Ramírez, G Jiang, H Kohn, D Xiong, Y Thompson, A Anderson, H |
| author_sort | Roche, C |
| collection | OXFORD |
| description | Strapped or "basket-handle" porphyrins have been investigated previously as hemoglobin mimics and catalysts. The facial selectivity of their interactions with axial ligands is a sensitive test for noncovalent bonding. Here the binding of pyridyl ligands to zinc porphyrins with thioester-linked alkyl straps is investigated in solution by NMR spectroscopy and UV-vis titration, and in the solid state by X-ray crystallography. We expected that coordination of the axial ligand would occur on the less hindered face of the porphyrin, away from the strap. Surprisingly, attractive interactions between the strap and the ligand direct axial coordination to the strapped face of the porphyrin, except when the strap is short and tight. The strapped porphyrins were incorporated into π-conjugated cyclic porphyrin hexamers using template-directed synthesis. The strap and the sulfur substituents are located either inside or outside the porphyrin nanoring, depending on the length of the strap. Six-porphyrin nanorings with outwardly pointing sulfur anchors were prepared for exploring quantum interference effects in single-molecule charge transport. |
| first_indexed | 2024-03-07T02:50:37Z |
| format | Journal article |
| id | oxford-uuid:ad8f802e-6036-4470-a39a-f317e05f3a94 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:50:37Z |
| publishDate | 2017 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:ad8f802e-6036-4470-a39a-f317e05f3a942022-03-27T03:36:33ZUnexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanoringsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ad8f802e-6036-4470-a39a-f317e05f3a94EnglishSymplectic Elements at OxfordAmerican Chemical Society2017Roche, CLuo, QGil-Ramírez, GJiang, HKohn, DXiong, YThompson, AAnderson, HStrapped or "basket-handle" porphyrins have been investigated previously as hemoglobin mimics and catalysts. The facial selectivity of their interactions with axial ligands is a sensitive test for noncovalent bonding. Here the binding of pyridyl ligands to zinc porphyrins with thioester-linked alkyl straps is investigated in solution by NMR spectroscopy and UV-vis titration, and in the solid state by X-ray crystallography. We expected that coordination of the axial ligand would occur on the less hindered face of the porphyrin, away from the strap. Surprisingly, attractive interactions between the strap and the ligand direct axial coordination to the strapped face of the porphyrin, except when the strap is short and tight. The strapped porphyrins were incorporated into π-conjugated cyclic porphyrin hexamers using template-directed synthesis. The strap and the sulfur substituents are located either inside or outside the porphyrin nanoring, depending on the length of the strap. Six-porphyrin nanorings with outwardly pointing sulfur anchors were prepared for exploring quantum interference effects in single-molecule charge transport. |
| spellingShingle | Roche, C Luo, Q Gil-Ramírez, G Jiang, H Kohn, D Xiong, Y Thompson, A Anderson, H Unexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanorings |
| title | Unexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanorings |
| title_full | Unexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanorings |
| title_fullStr | Unexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanorings |
| title_full_unstemmed | Unexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanorings |
| title_short | Unexpected interactions between alkyl straps and pyridine ligands in sulfur-strapped porphyrin nanorings |
| title_sort | unexpected interactions between alkyl straps and pyridine ligands in sulfur strapped porphyrin nanorings |
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