Artículo
Photophysical properties of -Re(I)(CO)3(phen) pendants grafted to a poly-4-vinylpyridine backbone: A correlation between photophysical properties and morphological changes of the backbone
Saavedra Moncada, Alejandra
; Garcia Einschlag, Fernando Sebastian
; Prieto, Eduardo Daniel
; Ruiz, Gustavo Teodosio
; Lappin, Alexander G.; Ferraudi, Guillermo J.; Wolcan, Ezequiel





Fecha de publicación:
05/2016
Editorial:
Elsevier Science Sa
Revista:
Journal of Photochemistry and Photobiology A: Chemistry
ISSN:
1010-6030
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Resumen
Photochemical and photophysical properties of a polymer, Re-P4VP, consisting of -Re(I)(CO)3(phen) pendants grafted to a poly-4-vinylpyridine backbone, P4VP, were interpreted on the bases of morphological transformations. These transformations are responsible of a significant increase of the MLCTRe(I)→phen excited state luminescence lifetime when the polymer concentration is increased. Also a nearly 8-fold increase in the luminescence quantum yield resulted from the protonation of Re-P4VP with consequent changes of the excited state decay kinetics. Results of TEM and AFM morphological studies on P4VP and Re-P4VP in the presence of HClO4 acid, i.e., to form Re-P4VPHn n+, revealed that they have concentration dependent morphologies. From low to large concentrations of the Re-P4VP polymer, the morphology of Re-P4VP varies from a nonhomogeneous distribution of spherical nanoaggregates coexisting with micrometer size fibers to an homogeneous distribution of spherical nanoaggregates with diameters around 25 nm. The Re-P4VP morphology is also altered when the polymer pyridines are protonated. Protonation of diluted solutions of Re-P4VP polymers decrease the sizes of the nanoaggregates and small objects with diameters smaller than 10 nm appear.
Archivos asociados
http://dx.doi.org/10.1016/j.jphotochem.2016.01.001
https://www.sciencedirect.com/science/article/pii/S1010603015301799
https://www.sciencedirect.com/science/article/pii/S1010603015301799

Citación:
Saavedra Moncada, Alejandra; Garcia Einschlag, Fernando Sebastian; Prieto, Eduardo Daniel; Ruiz, Gustavo Teodosio; Lappin, Alexander G.; et al.; Photophysical properties of -Re(I)(CO)3(phen) pendants grafted to a poly-4-vinylpyridine backbone: A correlation between photophysical properties and morphological changes of the backbone; Elsevier Science Sa; Journal of Photochemistry and Photobiology A: Chemistry; 321; 5-2016; 284-296
Comunidades y colecciones
-
Articulos(INIFTA) [729]
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.