Lanthanide-cored fluorinated dendrimer complexes: synthesis and luminescence characterization
2005 (English)In: Journal of Luminescence, ISSN 0022-2313, E-ISSN 1872-7883, Vol. 111, no 4, 265-283 p.Article in journal (Refereed) Published
Eu3+-. Tb3+- and Er3+-cored dendrimer complexes were prepared by self-assembly of three fluorinated dendrons, each with a carboxylate anion focal point, around the lanthanide ion. Energy transfer from the peripheral fluorinated phenyl moieties of the dendrons to the lanthanide cation was evidenced spectroscopically for Eu3+- and Tb3+-cored dendrimer complexes in solution. The excitation of perfluorinated aromatic groups was found to decay with ca. 0.7 ns and a longer decay time 10-13 ns was related to the coordination at the Ln(3+) focal point. Luminescence from the lanthanide core decays with lifetime in the range 1-1.5ms over a wide concentration range (mu M-mM), similar to the luminescence decay time of the corresponding acetate ion complexes in D2O. The main quenching mechanism of the lanthanide emission appears to be due to vibrations among surrounding C-H bonds of the intermediate shell of the flexible dendrimer scaffold. Antenna effect and energy harvesting from the surface of the dendrimer and transfer to the core was the main mechanism for luminescecnce in the dendrimer complexes with lanthanide cations.
Place, publisher, year, edition, pages
2005. Vol. 111, no 4, 265-283 p.
dendrimer, lanthanide cation, luminescence, fluorescence, near-infrared luminescence, energy-transfer, er3+ complexes, polymers, europium, fluorescence, porphyrin, glasses, nd3+, acid
IdentifiersURN: urn:nbn:se:kth:diva-14623DOI: 10.1016/j.jlumin.2004.10.007ISI: 000227812200006ScopusID: 2-s2.0-14544294354OAI: oai:DiVA.org:kth-14623DiVA: diva2:332664
QC 201005252010-08-052010-08-05Bibliographically approved