Nanoscale Materials Synthesis. 1. Solvent Effects on Hydridoborate Reduction of Copper Ions

The reduction of CuBr2 by NaBH4 in a variety of solvents yields nanoscale metallic copper as the primary product. Although the product of this reaction is largely solvent independent, the studies show that reaction times, the total volume of gaseous products, and nanoscale particle sizes are depende...

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Bibliographic Details
Published in:Langmuir 1999-03, Vol.15 (7), p.2322-2326
Main Authors: Jackelen, Anne-Marie L, Jungbauer, Michelle, Glavee, George N
Format: Article
Language:English
Subjects:
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Solutions
Solvation. Solvent properties
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Summary:The reduction of CuBr2 by NaBH4 in a variety of solvents yields nanoscale metallic copper as the primary product. Although the product of this reaction is largely solvent independent, the studies show that reaction times, the total volume of gaseous products, and nanoscale particle sizes are dependent on solvent properties. The reaction occurred instantaneously in polar, protic, and acidic solvents such as methanol and ethanol. In contrast, in polar, aprotic, and coordinating solvents such as tetrahydrofuran and acetonitrile, the reaction was slow. Particle sizes increased as the rate of reaction decreased. For solvents in which similar reaction times were observed, the reaction carried out in polar, aprotic, and coordinating solvents yielded copper samples with larger particle sizes. The acid properties of the solvent controlled the amount of gas evolved in these experiments.
ISSN:0743-7463
1520-5827
DOI:10.1021/la9807311