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Covalently assembly and photophysical properties of novel lanthanide centered hybrid materials by functionalized thioacylureas bridge

Paper ID Volume ID Publish Year Pages File Format Full-Text
28031 44056 2008 8 PDF Available
Title
Covalently assembly and photophysical properties of novel lanthanide centered hybrid materials by functionalized thioacylureas bridge
Abstract

A novel molecular precursor (abbreviated as TAM-Si) derives from thioacetaminde (TAM) modified by 3-(triethoxysilyl)-propyl isocyanate (TEPIC) though the hydrogen transfer addition reaction. Then TAM-Si behaves as functional molecular bridge which coordinates to RE3 (Eu3+, Tb3+) as well as form SiO network with inorganic precursor (TEOS) after a sol–gel process (cohydrolysis and copolycondensation reaction), resulting in the covalently bonded hybrid materials (RE–TAM-Si). On the other hand, the hybrid material of TAM-Si without introduction of RE3+ as well has been obtained. SEM pictures indicate that the TAM-Si show the sphere micromorphology with particle size of micrometer dimension while RE–TAM-Si hybrids present different nanometer particle, which suggests that lanthanide ions has influence on the microstructure of hybrid systems through its coordinated effect. The blue emission for TAM-Si hybrids and the narrow-width green and red emissions were achieved for Tb3+ and Eu3+ ions, respectively, indicating that the intramolecular energy transfer process take place from photoactive group to Tb3+ and Eu3+ ions in these hybrid microsphere systems. Especially the lifetime and quantum efficiency for europium hybrids have been determined.

Keywords
Molecular hybrid system; Photophysical property; Lanthanide; Thioacetaminde functionalized molecular bridge; Microsphere; Nanoparticle
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Covalently assembly and photophysical properties of novel lanthanide centered hybrid materials by functionalized thioacylureas bridge
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 197, Issues 2–3, 25 June 2008, Pages 351–358
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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