Loading...
Please wait, while we are loading the content...
Similar Documents
Redox and photocatalytic properties of a NiII complex with a macrocyclic biquinazoline (Mabiq) ligand† †Dedicated to the memory of Inge Grübel. ‡ ‡Electronic supplementary information (ESI) available: CIF files, synthetic procedures, spectroscopic, electrochemical and DFT computational data. CCDC 15
| Content Provider | Semantic Scholar |
|---|---|
| Author | Grübel, Michael Bosque, Irene Altmann, Philipp J. Bach, Thorsten Hess, Corinna R. |
| Copyright Year | 2018 |
| Abstract | We present a late, first row transition metal photosensitizer that promotes photocatalytic C-C bond formation. The title compound, [Ni(Mabiq)]OTf, as well as its one-electron reduced form, Ni(Mabiq), were synthesized and molecular structures of both were obtained. The electronic structure of the reduced complex additionally was characterized by spectroscopic and DFT computational methods. Notably, [NiII(Mabiq)]OTf is photoactive: reduction of the compound was achieved photochemically upon irradiation at λ = 457 nm and reductive quenching by NEt3. The performance of [Ni(Mabiq)]OTf as a photoredox catalyst was examined in the cyclization of a bromoalkyl-substituted indole. In this reaction, the first-row transition metal compound is comparable if not superior to [Ru(bpy)3]2+ in terms of efficiency (turnover number) and chemoselectivity. Studies using a series of sacrificial donor amines indicate that the excited state redox potential of [Ni(Mabiq)]+* is ≥1.25 V vs. SCE. This value is similar to the excited state potential of commonly employed noble metal based photocatalysts. The Ni-Mabiq compound thus provides a rare example of an earth-abundant photoredox catalyst. |
| Starting Page | 3313 |
| Ending Page | 3317 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/c7sc05320g |
| PubMed reference number | 29780460 |
| Journal | Medline |
| Volume Number | 9 |
| Alternate Webpage(s) | http://pubs.rsc.org/en/content/articlepdf/2018/SC/C7SC05320G |
| Alternate Webpage(s) | https://doi.org/10.1039/c7sc05320g |
| Journal | Chemical science |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
