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Gold Nanomolecules 

Nanoscience is a new area of science that has generated excitement worldwide. Nanomaterials are being developed to address some of the world’s biggest challenges, including: clean, affordable energy; stronger, lighter, more durable materials; medical devices and drugs to detect and treat diseases; sensors to detect harmful chemical or biological agents; lighting that uses a fraction of the energy; low-cost filters to provide clean drinking water. We work on molecular gold nanoparticles (<2nm) that have precise number of gold atoms and ligands. Commercialization of nanomaterials and design of nanoengineered products will require: understanding of the fundamental properties; controlled synthetic and processing conditions. In my research group, we work on synthesis and characterization (mass spectrometry, NMR, optical spectroscopy) of these molecular gold nanoparticles.


* Kumara, C.; Dass, A., AuAg alloy nanomolecules with 38 metal atoms. Nanoscale 2012, 4 (14), 4084-4086 link

* Martin, M. N.; Li, D.; Dass, A.; Eah, S.-K., Ultrafast, 2 min synthesis of monolayer-protected gold nanoclusters (d < 2 nm). Nanoscale 2012, 4 (14), 4091-4094 link

* Knoppe, S.; Dolamic, I.; Dass, A.; Bürgi, T., Separation of Enantiomers and CD Spectra of Au40(SCH2CH2Ph)24: Spectroscopic Evidence for Intrinsic Chirality. Angew. Chem. Int. Ed. 2012, n/a-n/a, http://dx.doi.org/10.1002/anie.201202369

* Knoppe, S.; Dass, A.; Burgi, T., Strong non-linear effects in the chiroptical properties of the ligand-exchanged Au38 and Au40 clusters. Nanoscale 2012, 4 (14), 4211-4216  link

* Harkness, K. M.; Tang, Y.; Dass, A.; Pan, J.; Kothalawala, N.; Reddy, V. J.; Cliffel, D. E.; Demeler, B.; Stellacci, F.; Bakr, O. M.; McLean, J. A., Ag44(SR)304-: a silver-thiolate superatom complex. Nanoscale 2012, 4 (14), 4269-4274 link

*  Dolamic, I.; Knoppe, S.; Dass, A.; Bürgi, T., First enantioseparation and circular dichroism spectra of Au38 clusters protected by     achiral ligands. Nature Communications 2012, 3, 798 link

*  Dass, A., Nano-scaling law: geometric foundation of thiolated gold nanomolecules. Nanoscale 2012, 4 (7), 2260-2263  link

11.  "Interstaple Dithiol Cross-Linking in Au25(SR)18 Nanomolecules: A Combined Mass Spectrometric and Computational Study"
        Vijay Reddy Jupally‡, Rajesh Kota‡, Eric Van Dornshuld‡, Daniell L. Mattern‡, Gregory S. Tschumper‡, De-en Jiang†, and                   Amala  Dass*‡  J. Am. Chem. Soc.  2011, 20258-20266

10.  "Faradaurate Nanomolecules: A Superstable Plasmonic 76.3 kDa Cluster"
        Amala Dass,
        J. Am. Chem. Soc. 2011, 19259-19261  Supporting information

9.   “(AuAg)144(SR)60 alloy nanomolecules”  Chanaka Kumara and Amala Dass, Nanoscale 2011, 3, 3064-3067.     [ PDF ]

8.   “Size Exclusion Chromatography for Semi-Preparative Scale Separation of Au38(SR)24 and Au40(SR)24 and larger clusters”
       Stefan Knoppe, Julien Boudon, Igor Dolamic, Amala Dass, and Thomas Burgi, Anal. Chem. 2011, 83, 5056-5061.

7.   “Au36(SPh)23 Nanomolecules” Praneeth Reddy Nimmala and Amala Dass, J. Am. Chem. Soc. 2011, 133, 9175–9177.

6.    “Ligand Exchange Reactions on Au38 and Au40 Clusters: A Combined Circular Dichroism and Mass Spectrometry Study”
       S. Knoppe, A. C. Dharmaratne, E. Schreiner, A. Dass, and T. Burgi, J. Am. Chem. Soc. 2010, 132, 16783–16789.

5.   “Ion Mobility Mass Spectrometry of Au25(SCH2CH2Ph)18 Nanoclusters”L. A. Angel, L. T. Majors, A. C. Dharmaratne, A. Dass,
       ACS Nano 2010, 4, 4691-4700.

4.   “Surfactant-free Synthesis of Ultra-small Gold Nanoclusters” S. Reilly, T. Krick, A. Dass,  J. Phys. Chem. C. 2010, 144, 741-745.

3.   “Solvent-Dependent Stability of Monolayer-Protected Au38 Clusters” O. Toikkanen, S. Carlsson, A. Dass, G. Ronnholm, N. Kalkkinen, B. M. Quinn,  J. Phys. Chem. Lett. 2010, 1, 32–37.

2.   “Nanocluster Size Evolution Studied by Mass Spectrometry in Room Temperature Au25(SR)18 Synthesis” A. C. Dharmaratne, T. Krick, A. Dass, J. Am. Chem. Soc. 2009, 131, 13604–13605.

1.   “Mass Spectrometric Identification of Au68(SR)34 Molecular Gold Nanoclusters with 34-Electron Shell Closing” A. Dass,
       J. Am. Chem. Soc. 2009, 131, 11666-11667.

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