Nano Express
Supported quantum clusters of silver as enhanced catalysts for reduction
DST Unit of Nanoscience (DST UNS), Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
Nanoscale Research Letters 2011, 6:123 doi:10.1186/1556-276X-6-123
Published: 8 February 2011Additional files
Additional file 1:
Figure S1. HRTEM image of Al2O3@Ag7,8. Black dots in (A) correspond to Ag QCs which are marked. (B) Lattice-resolved image of fused silver particles obtained after 20 min of electron beam exposure showing the (111) plane of Ag. (C) EADX spectrum of Al2O3@Ag7,8 showing the presence of Ag, corresponding to the elemental map of Al (D) and Ag (E) measured in TEM.
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Additional file 2:
Figure S2. Isobestic point in the UV-vis spectra of the reduction of 4-np at 15°C. Minor changes are attributed to the presence of particles of supported clusters in the solution.
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Additional file 3:
Table 1. Rate constant for the reduction of 4-np with NaBH4 in the presence of Al2O3@Ag7,8
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Figure S3. (A) UV-vis spectra of the increase in concentration of 4-ap during the reduction process at 35°C (a), 25°C (b), and 15°C (c). (B) A plot of concentration versus 1/T for the formation of 4-ap.
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Additional file 5:
Figure S4. Reusability of supported Al2O3@Ag7,8 for the reduction of 4-np, the second cycle (A), the third cycle (B), the fourth cycle (C), and the fifth cycle (D).
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Additional file 6:
Figure S5. Positive ion ESI-MS of the product obtained in 50:50 water:methanol mixture, compared with those of pure 4-np and 4-ap. Complete disappearance of the peak of 4-np is noted.
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Additional file 7:
Figure S6. XPS survey spectra of Al2O3@Ag7,8 before reaction (black), after the first (red) and the third (green) cycles of reduction reactions.
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Additional file 8:
Figure S7. UV-vis spectra for the reduction of 4-np with NaBH4 in the presence of supported Ag@citrate nanoparticles.
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Additional file 9:
Figure S8. UV-vis spectra for the reduction of 3-na (A), 4-na (B), and 3-np (C) with NaBH4 in the presence of Al2O3@Ag7,8.
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Additional file 10:
Figure S9. UV-vis spectra for the reduction of 4-np as a function of time, with SiO2@Ag7,8 (A1-A3), TiO2@Ag7,8 (B1-B3), and Fe2O3 @Ag7,8 (C1-C3). 1, 2, and 3 refer to the first, second, and third cycles of reduction.
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