Abstract
The sol-gel process is a methodology used to obtain organic-inorganic hybrid solids, which open new possibilities in the field of material science. The sol-gel technique offers a low temperature attractive approach for introducing organic molecules into amorphous materials. In order to introduce tetrakis (2-hydroxy-5-nitrophenyl)porphyrin covalently bounded to a silicate matrix, the inorganic precursor 3-isocyanatopropyltriethoxysilane was added (molar ratio 2:1) to the porphyrin solution in anhydrous dimethylformamide and triethylamine. The isolated porphyrin and the hybrid porphyrinosilica have excitation maximum centred at 400 nm and 424 nm, respectively and the emission spectra for both materials has bands centred at 650 nm and 713 nm. The formation of hybrid matrix was investigated by FTIR.
Highlights
Hybrid materials, in which organic molecules are incorporated into a silica matrix using the sol-gel process[1], have properties of an inorganic matrix and the functionality of the organic component
Sol-Gel method has been proposed[13] to create solid-state visible laser for medical applications, such as photodynamic therapy (PDT), which is an approach for treatment of malignant tumors, and laser-induced fluorescence (LIF) diagnostics
This work presents the synthesis of a new red luminescent hybrid porphyrinosilica, which we label T2H5APPH2 incorporated into a silicate matrix, by sol gel methods and data on its properties
Summary
In which organic molecules are incorporated into a silica matrix using the sol-gel process[1], have properties of an inorganic matrix and the functionality of the organic component. The development of sol-gel derived hybrids where luminescent centers are incorporated in organic or inorganic hosts is a recently theme in the field of luminescent materials[5,6] These materials combine the absorption of ultraviolet light and subsequent highly efficient emission[7]. Incorporation of chromophores such as porphyrins or metalloporphyrins into polymer networks has been investigated for applications in catalysis and sensor devices. Sol-Gel method has been proposed[13] to create solid-state visible laser for medical applications, such as photodynamic therapy (PDT), which is an approach for treatment of malignant tumors, and laser-induced fluorescence (LIF) diagnostics Both techniques need lasers emitting in the red region of the spectrum. This work presents the synthesis of a new red luminescent hybrid porphyrinosilica, which we label T2H5APPH2 incorporated into a silicate matrix, by sol gel methods and data on its properties
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