Abstract
Covalent tethering of PPh2NC6H4C≡CH2 ligands (PPh2NC6H4C≡CH2 = 1,5-di-(4-ethynylphenyl)-3,7-diphenyl-1,5-diaza-3,7-diphosphacyclooctane) to planar, azide-terminated glassy carbon electrode surfaces has been accomplished using a CuI-catalyzed alkyne-azide cycloaddition (CuAAC) coupling reaction, using a BH3←P protection-deprotection strategy. Deprotected, surface-confined ligands were metallated using [NiII(MeCN)6](BF4)2. X-ray photoelectron spectroscopic measurements demonstrate that metallation introduced 1.3 equivalents NiII per diphosphine onto the electrode surface. Exposure of the surface to a second diphosphine ligand, PPh2NPh2, resulted in the removal of Ni from the surface. Protection, coupling, deprotection, and metallation conditions were optimized using solution-phase model systems, with benzyl azide as a model for the azide-terminated carbon surface; these reactions generate a [NiII(diphosphine)2]2+ complex.
Original language | English |
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Pages (from-to) | 12225-12233 |
Number of pages | 9 |
Journal | Dalton Transactions |
Volume | 44 |
Issue number | 27 |
DOIs | |
Publication status | Published - Jul 21 2015 |
ASJC Scopus subject areas
- Inorganic Chemistry