Synthesis & complexation of tripodal tris (1,2,3-triazol-5-ylidene) mesoionic carbene ligands
Herein, the synthesis and coordination of a new 1,2,3-triazol-5-ylidene ligand system using cobalt salts to form an imido cobalt complex. 1,2,3-triazol-5-ylidenes are a special class of mesoionic carbenes (MICs) synthesised from triazoles, which are conveniently obtained through [2+3] “click” cycloa...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2018
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| Online Access: | http://hdl.handle.net/10356/76187 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Herein, the synthesis and coordination of a new 1,2,3-triazol-5-ylidene ligand system using cobalt salts to form an imido cobalt complex. 1,2,3-triazol-5-ylidenes are a special class of mesoionic carbenes (MICs) synthesised from triazoles, which are conveniently obtained through [2+3] “click” cycloaddition reactions. Isolation of the target tris[(1,2,3-triazol-5-ylidene)methyl] amine ligand precursors, H3Ln(X)3, in high yield has proven to be difficult. The free carbene, Ln formed was found to be stable at -80°C based on low temperature 1H NMR studies done. Two different complexation routes, silver transmetalation and direct metalation were explored. Sufficient quantities of cobalt(II) complex, [CoL1(CH3CN)][OTf]2 was successfully synthesised via the direct metalation. [CoL1(CH3CN)][OTf]2 synthesised was characterised using 1H NMR, cyclic voltammetry and X-Ray crystallography. |
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