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Phase Transfer Induced Enhanced Stability of Monolayer Protected Silver Quantum Clusters

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Abstract

Mercaptosuccinic acid (MSA) protected silver clusters (Ag@MSA) were synthesized and their stability was monitored both in an aqueous and in a toluene phase. In the former, the pH of the cluster solution was tuned between 3 and 10 using ammonium acetate buffer, and the cluster stability was tested. The clusters were unstable at all measured pH values, whereas in the toluene phase, by using sterically hindered counter ion (tertraoctylammonium, TOA), the stability of the clusters was improved significantly. The phase transferred clusters in the toluene phase showed very high stability over months at room temperature. Transmission electron microscopy images show an average cluster size of ~ 2.05 nm. Size exclusion chromatography and Electrospray Ionisation Mass Spectrometry (ESI–MS) measurements were employed to analyse the phase transferred clusters. Importantly, Ag4MSA4 − type stable fragments were observed in ESI–MS measurements. The [Ag8(MSA)8(TOA)5]2− was the largest cluster identified by ESI–MS.

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Acknowledgements

This research was supported by the National Research Program (NRP 62, project number 406240_126108) of the Swiss National Science Foundation (SNSF) and by the University of Bern. N. B. acknowledges gratefully the provision of the TEM facility by the Institute of Anatomy of the University of Bern. E. K. also acknowledges the support from The Academy of Finland (Projects Nos. 284562 and 278743).

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Author notes

  1. Bodappa Nataraju

    Present address: MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China

Authors and Affiliations

  1. Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland

    Bodappa Nataraju, Hans Siegenthaler & Thomas Wandlowski

  2. Nanoscience Center, Department of Chemistry, University of Jyväskylä, 40014, Jyväskylä, Finland

    Elina Kalenius

  3. Department of Organic Chemistry, Weizmann Institute of Science, 76100, Rehovot, Israel

    Thumu Udayabhaskararao

  4. DST Unit on Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600 036, India

    Thalappil Pradeep

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  1. Bodappa Nataraju
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Correspondence to Bodappa Nataraju.

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Nataraju, B., Kalenius, E., Udayabhaskararao, T. et al. Phase Transfer Induced Enhanced Stability of Monolayer Protected Silver Quantum Clusters. J Clust Sci 29, 41–48 (2018). https://doi.org/10.1007/s10876-017-1299-5

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