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Petroski J, Chou MH, Creutz C: Rapid phosphine exchange on 1.5-nm gold nanoparticles. Inorg Chem. 2004 Mar 8;43(5):1597-9.
Triphenylphosphine-cappped, 1.5-nm gold nanoparticles "Au (101)(PPh (3))(21) Cl (5)" prepared following Hutchison's procedure (Weare, W. W.; Reed, S. M.; Warner, M. G.; Hutchison, J. E. J. Am. Chem. Soc. 2000, 122, 12890) undergo rapid exchange of capping ligand phosphine with dissociated and added phosphine in dichloromethane solvent at 298 K. Remarkably, while the (1) H NMR spectrum resonances of the attached phosphine are broad, characteristic of a range of incompletely averaged environments, the (31) P NMR spectrum (observable only at 213 K and below) exhibits a single, narrow resonance indicating that all of the phosphorus atoms are magnetically equivalent. |
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