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• W2014452628 endingPage "1986" @default.
• W2014452628 startingPage "1978" @default.
• W2014452628 abstract "The reaction of Pt(dba)2 with CO (1 atm) in toluene affords a brown precipitate which can be isolated and redissolved in CH2Cl2 to give a colloidal solution of fcc platinum particles with a large size dispersity (10−20 Å, I). Redissolution of I in THF leads to stable 12 Å fcc platinum particles (II) which can be isolated and characterized by high-resolution electron microscopy (HREM) and wide-angle X-ray scattering (WAXS). The original reaction in THF leads to the direct formation of II. Addition of 0.2 equiv of PPh3 to II yields a new colloid, III, of the same size but of icosahedral structure. III was characterized by HREM and spectroscopic techniques. In particular, 13C and 31P NMR spectroscopy demonstrates the absence of a Knight shift for these particles. Addition of excess triphenylphosphine leads to another species, IV, displaying broader size distribution with a maximum at 17 Å and an fcc structure. The reaction of I with more than 0.2 equiv of PPh3 affords mixtures containing colloids, clusters (predominantly Pt5(CO)6(PPh3)4), and mononuclear complexes. Both the formation of the colloids and their transformation into molecular species is rapid at room temperature. It is suggested that such processes may be more frequent in organometallic chemistry than previously thought." @default.
• W2014452628 created "2016-06-24" @default.
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• W2014452628 date "1996-01-01" @default.
• W2014452628 modified "2023-10-16" @default.
• W2014452628 title "Synthesis and Isolation of Cuboctahedral and Icosahedral Platinum Nanoparticles. Ligand-Dependent Structures" @default.
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• W2014452628 doi "https://doi.org/10.1021/cm960338l" @default.
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