A route for coordination of Eu3+ by dibenzoylmethane (DBM) covalently bonded inside hexagonal
mesoporous silica was established here to produce the highly luminescent nanomaterial SiDBM−Eu(DBM)2. Thermogravimetry, luminescence, X-ray diffraction, N2 adsorption, FTIR, FTRaman, 29Si NMR,
and 13C NMR in solid-state techniques were used to characterize SiDBM−Eu(DBM)2. The 29Si NMR
spectrum proved that the DBM was covalently bonded to a silica framework. Thermogravimetric and
titration data showed the 6.4 × 10-2 mmol of Eu3+ per gram of silica, and each Eu3+ is coordinated by
three DBMs in SiDBM−Eu(DBM)2. SEM images confirmed that this material is formed by nanoaggregates
with 200 nm diameter. N2 adsorption isotherms showed the SiDBM−Eu(DBM)2 complex with 800 m2
g-1 and 6.4 nm of porous diameter, characterizing mesoporosity of this nanomaterial. SiDBM−Eu(DBM)2
showed an efficient DBM to Eu3+ intramolecular energy process, namely, antenna effect, which favored
a highly luminescent behavior in this modified hexagonal mesoporous silica.
Syntheses of two water-soluble phthalocyanines (Pc) containing 5-aminolevulinic acid (ALA) linked to the core structure are described. These compounds were prepared by using original functionalizations, and they present remarkable structural and photophysical features, indicating that they could be applied to photodynamic therapy (PDT).
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