International Summer School PROGRAM - Laboratoire d'Infochimie ...

EUROPIUM(III) DOPED POLYELECTROLYTE
NANOCAPSULES. COLLOIDAL AND PHOTOPHYSICAL
PROPERTIES
R. Zairov, A.Mustafina, A.Konovalov
A.E.Arbuzov Institute of organic and physic chemistry KSC RAS,
Kazan, 420088, Russia, e-mail: rustem@iopc.ru
Novel highly luminescent europium(III) thenoyltrifluoroacetonate adduct with
phosphineoxide 1 was capsulated into polyelectrolyte (PE) capsule fabricated through
layer-by-layer procedure. The poly(sodium 4-styrenesulfonate) (PSS) was applied as the
first layer. Positively charged polyethyleneimine (PEI) has been deposited on PSS
coated particles resultin in their recharging from minus to plus. The further three layers
of the abovementioned oppositely charged polyelectrolytes were stepwise deposited on
PEI-PSS coated Eu(TTA)31 particles in the similar route. The multilayer PE shell
protects highly luminescent core from deactivation and decomposition (due to pH
changes or ligand substitution) and also provides colloidal stability of Eu(TTA)31
containing capsules in water.
Photophysical properties, size and
electrokinetic potential in aqueous
solutions were studied at the various
number of PE layers. AFM images of
dried samples were also obtained. The obtained core-shell nanoparticles exemplify
stimuli responsive colloids, which are able to give luminescent response on the
interfacial interactions with substrates. The quenching effect of organic (dye) and
inorganic (metal ions) is represented as the basis of sensing function.
The multifunctional core-shell nanoparticles were developed with luminescent
Eu(III) complex as the core and paramagnetic metal ions with high magnetic relaxation
rates (Cu(II), Mn(II) and Gd(III)) incorporated at the interlayer of the polyelectrolyte
multilayer shell.
Acknowledgement: RFBR (grant 10-03-00352a)