Determination of the Solubility Limit of Tris(dibenzylideneacetone) dipalladium(0) in Tetrahydrofuran/Water Mixtures
-
Stefan Franzen [1]
-
[1] North Carolina State University
North Carolina State University
Township of Raleigh, Estados Unidos
-
- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 88, Nº 5, 2011, págs. 619-623
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
-
Resumen
Determination of the solubility limit of a strongly colored organometallic reagent in a mixed-solvent system provides an example of quantitative solubility measurement appropriate to understand polymer, nanoparticle, and other macromolecular aggregation processes. The specific example chosen involves a solution of tris(dibenzylideneacetone) dipalladium(0), Pd2(dba)3, in THF/H2O mixtures, which has the desired properties of high absorption in the visible range (λmax = 528 nm) and significant difference in solubility in the two solvents THF and H2O. Pd2(dba)3 is readily available, safe, and commonly used in nanoparticle syntheses. The application of Flory−Huggins theory permits the fit of a quantitative model to data obtained from a straightforward laboratory experiment that can be conducted in less than 3 h. The absorbance of this compound is easily measured by UV−vis absorption spectroscopy. The application of the Beer−Lambert law to the data in this experiment is a useful exercise for students because the absorbances span three orders of magnitude.
