Adhesion of gold and silver nanoparticles onto urea-alkylamine inclusion compounds
Author
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Campos, Cristian
Author
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Muñoz, Martín
es_CL
Author
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Barrientos, Lorena
es_CL
Author
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Lang, Erika
es_CL
Author
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Jara Vergara, Paul
es_CL
Author
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Sobrados, Isabel
es_CL
Author
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Yutronic Sáez, Nicolás
es_CL
Admission date
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2014-01-27T15:41:47Z
Available date
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2014-01-27T15:41:47Z
Publication date
dc.date.issued
2013-02
Cita de ítem
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J Incl Phenom Macrocycl Chem (2013) 75:165–173
en_US
Identifier
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doi: 10.1007/s10847-012-0157-1
Identifier
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https://repositorio.uchile.cl/handle/2250/119709
General note
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Artículo de publicación ISI.
en_US
Abstract
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We report the synthesis and characterization of a new series of urea inclusion compounds containing primary alkylamine (octyl, decyl and dodecyl) as guests, as well as the deposition of gold and silver nanoparticles onto the crystalline surface of these complexes. X-ray diffraction confirms the inclusion process of the amine in the urea cavities. The structures determined for the three complexes correspond to a hexagonal channel structure with space group P6(1)22. Alkylamine-urea stoichiometric ratios in all cases satisfy the relationship 1:3n (n = 2 for octylamine and 3 for decylamine and dodecylamine), determined by elemental analysis. The deposition of gold and silver nanoparticles by the magnetron sputtering technique onto microcrystals of the complexes was analyzed by Diffuse Reflectance Spectroscopy, showing characteristic surface plasmon resonance for metal nanoparticles. Transmission electron microscopy demonstrates the presence of metal nanoparticles (MNPs) in a size range between 5 and 60 nm for gold and between 5 and 20 nm for silver, and furthermore, in some cases it shows vestiges of a hexagonal arrangement of the MNPs. X-ray diffraction and IR measurements demonstrate that the basic structure of the matrix remains unchanged after the MNPs adhesion. IR also shows increased broadening and intensity of the characteristic NH2 bending frequencies (1,597 cm(-1)) when the MNPs interact with the inclusion compounds. We conclude that the interactions between the inclusion compounds and metal nanoparticles occurs mainly through the amino groups of the guest molecules that can emerge from the entrance of the inclusion compound cavities attracted by the metallic nanoparticles, in opposition to the restoring van der Waals interactions present inside channels, which increase with increasing chain length of the guest molecules.
Schematic representation of urea inclusion compounds containing primary alkylamine (octyl, decyl and dodecyl) as guests and the deposition of gold and silver nanoparticles onto the crystalline surface of these complexes.
en_US
Patrocinador
dc.description.sponsorship
FONDECYT Projects 1090029 and 1080505 and a Conicyt Scholarship of Martín Muñoz. L. B. P acknowledges the support of FONDECYT
Project 11110138.