Abstract
The incorporation of a luminescent probe into a nano-vector is one of the approaches used to design chemosensors and nanocargos for drug delivery and theranostics. The location of the nano-vector can be followed using fluorescence spectroscopy together with the change of environment that affects the fluorescence properties. The ligand 9-anthracene carboxylate is proposed in this study as a luminescent probe to locate two types of manganese complexes inside three series of porous nanoparticles of different composition: resol-silica, carbon-silica and pure silica. The manganese complexes are a tetranuclear MnIII cluster [MnIII4(μ-O)2(μ-AntCO2)6(bpy)2(ClO4)2] with a butterfly core, and a MnII dinuclear complex [{MnII(bpy)(AntCO2)}2(μ-AntCO2)2(μ-OH2)]. The magnetic measurements indicate that both complexes are present as dinuclear entities when incorporated inside the particles. Both the Mn complexes and the nanoparticles are luminescent. However, when the metal complexes are introduced into the nanoparticles, the luminescent properties of both are altered. The study of the fluorescence of the nanoparticles’ suspensions and of the supernatants shows that MnII compounds seem to be more retained inside the particles than MnIII compounds. The resol-silica nanoparticles with MnII complexes inside is the material that presents the lowest complex leaching in ethanol.
Highlights
Nanomaterials possessing multiple functionalities is a blooming field of science boosted by the search of novel tools for nanomedecine, sensor technology, optical devices, nanochemistry where interfaces and hybrid precursors are at stake
We propose to study a multifunctional system based on porous nanoparticles of different composition
9-antracenecarboxylate (AntCO2 ) as ligands in order to incorporate them into different types of nanoparticles
Summary
Nanomaterials possessing multiple functionalities is a blooming field of science boosted by the search of novel tools for nanomedecine, sensor technology, optical devices, nanochemistry where interfaces and hybrid precursors are at stake. Different multifunctional materials have been developed, showing applications in fields such as optoelectronics, drug delivery and green chemical processes. All of these are key issues in our society. In most of the cases, serendipitous methods were used. They lacked molecular control at the interfaces. Recent studies using more rational designs of multifunctional materials propose new strategies. An alternative strategy is to incorporate a luminescent probe
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