Pyrene-Functionalized Ruthenium Nanoparticles: Novel Fluorescence Characteristics from Intraparticle Extended Conjugation

Autor:	Joseph P. Konopelski, Wei Chen, James W. Lewis, Nathaniel B. Zuckerman, Shaowei Chen
Rok vydání:	2009
Předmět:	Nanoparticle chemistry.chemical_element Conjugated system Photochemistry Fluorescence Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ruthenium chemistry.chemical_compound General Energy Monomer chemistry Proton NMR Pyrene Physical and Theoretical Chemistry Linker
Zdroj:	The Journal of Physical Chemistry C. 113:16988-16995
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp906874f
Popis:	Ruthenium nanoparticles functionalized with pyrene moieties were prepared by olefin metathesis reactions of carbene-stabilized nanoparticles with 1-vinylpyrene and 1-allylpyrene (referred to as Ru═VPy and Ru═APy, respectively). 1H NMR spectroscopic measurements showed that the surface concentration of the pyrene moieties was 26.4 and 22.9%, respectively. In fluorescence measurements, Ru═VPy nanoparticles exhibited two prominent emission bands at 392 and 490 nm, very similar to those of (E)-1,2-di(pyren-1-yl)ethene, suggesting that the particle-bound pyrene moieties might behave equivalently to pyrene dimers with a conjugated linker by virtue of the Ru═carbene π bonds. In sharp contrast, Ru═APy nanoparticles displayed only a single emission peak at 392 nm, consistent with monomeric pyrene derivatives of 1-vinylpyrene and 1-allylpyrene. This implies that the intraparticle extended conjugation might be effectively turned off by the insertion of an sp3 carbon into the chemical linker that bound the pyrene moi...
Databáze:	OpenAIRE
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