Journal
CHEMISTRY OF MATERIALS
Volume 23, Issue 13, Pages 3228-3236Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm2010852
Keywords
luminescence; silica nanoparticles; Zn; bipyridine; imaging; two-photon scanning microscopy
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Silica nanoparticles with a surface functionalized by two-photon absorbing ( SiO)Zn(OSi((OBu)-Bu-t)(3))(DEAS-bipy) chromophores are prepared via surface chemistry controlled at the molecular level. This involves the grafting of {Zn[OSi((OBu)-Bu-t)(3)](2)}(2) on the surface silanols of a silica partially dehydroxylated at 700 degrees C followed by the coordination of DEAS-bipy. The spectroscopic and photophysical properties of the grafted species ( SiO)Zn(OSi((OBu)-Bu-t)(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 x 10(3) GM; such two-photon brightness allows the imaging of a single nanoparticle using two-photon scanning microscopy.
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