The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand
The coordination chemistry of an electron-rich macrocyclic CNC pincer-ligand consisting of two pentamethylene tethered N-heterocyclic carbene moieties on a carbazole backbone (bimca<sup>C5</sup>) is investigated by mainly NMR spectroscopy and X-ray crystal structure analysis. A bridging...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/6/1669 |
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| author | Ronja Jordan Doris Kunz |
| author_facet | Ronja Jordan Doris Kunz |
| author_sort | Ronja Jordan |
| collection | DOAJ |
| description | The coordination chemistry of an electron-rich macrocyclic CNC pincer-ligand consisting of two pentamethylene tethered N-heterocyclic carbene moieties on a carbazole backbone (bimca<sup>C5</sup>) is investigated by mainly NMR spectroscopy and X-ray crystal structure analysis. A bridging coordination mode is found for the lithium complex. With the larger and softer potassium ion, the ligand adopts a facial coordination mode and a polymeric structure by intermolecular potassium nitrogen interactions. The facial coordination is also confirmed at a Cp*Ru fragment, while C-H activation under dehydrogenation at the alkyl chain is observed upon reaction with [Ru(PPh<sub>3</sub>)<sub>3</sub>Cl<sub>2</sub>]. In contrast, Pd(OAc)<sub>2</sub> reacts under C-H activation at the central carbon atom of the pentamethylene tether to an alkyl-pincer macrocycle. |
| first_indexed | 2024-03-10T13:09:27Z |
| format | Article |
| id | doaj.art-287190281ab74425b22993782f50d4cc |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T13:09:27Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-287190281ab74425b22993782f50d4cc2023-11-21T10:50:28ZengMDPI AGMolecules1420-30492021-03-01266166910.3390/molecules26061669The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer LigandRonja Jordan0Doris Kunz1Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, D-72076 Tübingen, GermanyInstitut für Anorganische Chemie, Eberhard Karls Universität Tübingen, D-72076 Tübingen, GermanyThe coordination chemistry of an electron-rich macrocyclic CNC pincer-ligand consisting of two pentamethylene tethered N-heterocyclic carbene moieties on a carbazole backbone (bimca<sup>C5</sup>) is investigated by mainly NMR spectroscopy and X-ray crystal structure analysis. A bridging coordination mode is found for the lithium complex. With the larger and softer potassium ion, the ligand adopts a facial coordination mode and a polymeric structure by intermolecular potassium nitrogen interactions. The facial coordination is also confirmed at a Cp*Ru fragment, while C-H activation under dehydrogenation at the alkyl chain is observed upon reaction with [Ru(PPh<sub>3</sub>)<sub>3</sub>Cl<sub>2</sub>]. In contrast, Pd(OAc)<sub>2</sub> reacts under C-H activation at the central carbon atom of the pentamethylene tether to an alkyl-pincer macrocycle.https://www.mdpi.com/1420-3049/26/6/1669pincer ligandmacrocycleN-heterocyclic carbenelithiumpotassiumruthenium |
| spellingShingle | Ronja Jordan Doris Kunz The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand Molecules pincer ligand macrocycle N-heterocyclic carbene lithium potassium ruthenium |
| title | The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand |
| title_full | The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand |
| title_fullStr | The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand |
| title_full_unstemmed | The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand |
| title_short | The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand |
| title_sort | fascinating flexibility and coordination modes of a pentamethylene connected macrocyclic cnc pincer ligand |
| topic | pincer ligand macrocycle N-heterocyclic carbene lithium potassium ruthenium |
| url | https://www.mdpi.com/1420-3049/26/6/1669 |
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