1. pH-Induced transformation of ligated Au-25 to brighter Au-23 nanoclusters
- Author
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Katarzyna Matczyszyn, Mirosława Różycka, Magdalena Wojtas, Zeljka Sanader, Magdalena Waszkielewicz, Marek Samoc, Muhammad T. Sajjad, Rodolphe Antoine, Franck Bertorelle, Ashu K. Bansal, Vlasta Bonacic-Koutecky, Andrzej Ozyhar, Ifor D. W. Samuel, Clothilde Comby-Zerbino, Xavier Dagany, Joanna Olesiak-Banska, Wroclaw University of Science and Technology, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), SUPA School of Physics and Astronomy [University of St Andrews], University of St Andrews [Scotland]-Scottish Universities Physics Alliance (SUPA), University of Split, Humboldt-Universität zu Berlin, University of St Andrews. Organic Semiconductor Centre, University of St Andrews. School of Physics and Astronomy, and University of St Andrews. Condensed Matter Physics
- Subjects
Materials science ,Ph induced ,NDAS ,02 engineering and technology ,Luminescence quantum yield ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Nanoclusters ,symbols.namesake ,[SPI]Engineering Sciences [physics] ,Materials Science(all) ,Stokes shift ,[CHIM]Chemical Sciences ,General Materials Science ,QC ,[PHYS]Physics [physics] ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Transformation (genetics) ,QC Physics ,symbols ,Thiolate-protected gold nanoclusters ,Au23Capt17 ,luminescence ,DFT calculations ,Absorption (chemistry) ,0210 nano-technology ,Luminescence - Abstract
VBK and ŽS appreciate funding from Center of Excellence (STIM) at the University of Split. This research was supported by STIM-REI, a project funded by European Union from European Structural and Investment Funds 2014–2020. Contract Number KK.01.1.1.01.0003. This work was supported by the National Science Centre under grants DEC-2013/10/A/ST4/00114 and DEC-2013/09/B/ST5/03417 and by a statutory activity subsidy from the Polish Ministry of Science and Higher Education for the Faculty of Chemistry of Wroclaw University of Science and Technology. We would like to acknowledge the financial support from the French-Croatian project “International Laboratory for Nano Clusters and Biological Aging, LIA NCBA”. IDWS acknowledges the support from a Royal Society Wolfson Research Merit Award. Thiolate-protected gold nanoclusters have recently attracted considerable attention due to their size-dependent luminescence characterized by a long lifetime and large Stokes shift. However, the optimization of nanocluster properties such as the luminescence quantum yield is still a challenge. We report here the transformation of Au25Capt18 (Capt labels captopril) nanoclusters occurring at low pH and yielding a product with a much increased luminescence quantum yield which we have identified as Au23Capt17. We applied a simple method of treatment with HCl to accomplish this transformation and we characterized the absorption and emission of the newly created ligated nanoclusters as well as their morphology. Based on DFT calculations we show which Au nanocluster size transformations can lead to highly luminescent species such as Au23Capt17. Postprint
- Published
- 2018
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