cm2010852_si_001.pdf (263.34 kB)
Download fileBright Luminescent Silica Nanoparticles for Two-Photon Microscopy Imaging via Controlled Formation of 4,4′-Diethylaminostyryl-2,2′-bipyridine Zn(II) Surface Complexes
journal contribution
posted on 2011-07-12, 00:00 authored by Nuria Rendón, Adrien Bourdolle, Patrice L. Baldeck, Hubert Le Bozec, Chantal Andraud, Sophie Brasselet, Christophe Coperet, Olivier MaurySilica nanoparticles with a surface functionalized by two-photon
absorbing (≡SiO)Zn(OSi(OtBu)3)(DEAS-bipy) chromophores are prepared via surface chemistry
controlled at the molecular level. This involves the grafting of {Zn[OSi(OtBu)3]2}2 on the surface silanols
of a silica partially dehydroxylated at 700 °C followed by the
coordination of DEAS-bipy. The spectroscopic and photophysical
properties of the grafted species (≡SiO)Zn(OSi(OtBu)3)(DEAS-bipy) compare well with that of
the molecular model {DEAS-bipyZn(OAc)2} with
the advantage of allowing a high density of chromophores on a nanometric
object (ca. 200 chromophores per silica particle of 12 nm). These
particles are luminescent and exhibit a giant two-photon cross-section
of about 90 × 103 GM; such two-photon brightness allows
the imaging of a single nanoparticle using two-photon scanning microscopy.