Enhancing electron accepting ability of triarylboron via pi-conjugation with 2,2'-bipy and metal chelation: 5,5'-bis(BMes(2))-2,2'-bipy and its metal complexes
| Autor: | Shu-Bin Zhao, Donal H. Macartney, Nicole Ross, Krista L. Huszarik, Ruiyao Wang, Suning Wang, Yi Sun, Wen-Li Jia |
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| Rok vydání: | 2007 |
| Předmět: |
Biphenyl
Ligand Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element General Chemistry Electron Biochemistry Medicinal chemistry Catalysis Metal chemistry.chemical_compound Colloid and Surface Chemistry chemistry visual_art visual_art.visual_art_medium Chelation Cyclic voltammetry Boron |
| Zdroj: | Journal of the American Chemical Society. 129(24) |
| ISSN: | 0002-7863 |
| Popis: | The synthesis of a new diboron compound, 5,5‘-bis(BMes2)-2,2‘-bipy (B2bipy, 1), has been accomplished. The conjugation of the 2,2‘-bipy unit with the two BMes2 groups in 1 has been found to greatly enhance the electron-accepting ability of the boron centers, compared to the biphenyl analogue. 1 is an effective chelate ligand for metal ions and three metal complexes; namely, [CuI(B2bipy)(PPh3)2][BF4], 2, PtII(B2bipy)Ph2, 3a, and PtII(B2bipy)Me2, 3b, have been synthesized. The binding of metal ions to B2bipy was found to further significantly increase the electron-accepting ability/Lewis acidity of the boron centers. Cyclic voltammetry diagrams revealed that the free ligand and all three complexes display two reversible reduction peaks that are separated by 0.31−0.40 V. The first reduction potential (E1/2) for 1, 2, 3a, and 3b was found to be −1.69, −1.36, −1.34, and −1.38 V, respectively, versus FeCp2+/0 in DMF, which supports that the electron-accepting ability of the metal complexes is much greater than ... |
| Databáze: | OpenAIRE |
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