Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 27, Pages 8404-8409Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201402073
Keywords
gold; host-guest chemistry; nanoparticles; macrocycles; surface chemistry
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Funding
- Spanish MINECO [MAT2010-15374, CTQ2011-22436, CTQ 2010-16390]
- Xunta de Galicia FEDER [2007/085, GPC 2013/006 10PXIB314218PR]
- Xunta de Galicia
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We present a simple procedure for the synthesis of quasi-spherical Au nanoparticles in a wide size range mediated by macrocyclic host molecules, ammonium pillar[ 5] arene (AP[5] A). The strategy is based on a seeded growth process in which the water-soluble pillar[5] arene undergoes complexation of the Au salt through the ammonium groups, thereby avoiding Au nucleation, while acting as a stabilizer. The presence of the pillar[5] arene onto the Au nanoparticle particle surface is demonstrated by surface-enhanced Raman scattering (SERS) spectroscopy, and the most probable conformation of the molecule when adsorbed on the Au nanoparticles surface is suggested on the basis of theoretical calculations. In addition, we analyze the host-guest interactions of the AP[5] A with 2-naphthoic acid (2NA) by using H-1 NMR spectroscopy and the results are compared with theoretical calculations. Finally, the promising synergetic effects of combining supramolecular chemistry and metal nanoparticles are demonstrated through SERS detection in water of 2NA and a polycyclic aromatic hydrocarbon, pyrene (PYR).
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