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Preparation and characterization of porphyrin chromophores immobilized on micro-silica gel beads

Paper ID Volume ID Publish Year Pages File Format Full-Text
29143 44124 2008 9 PDF Available
Title
Preparation and characterization of porphyrin chromophores immobilized on micro-silica gel beads
Abstract

Micro-silica gel beads (1a–c) immobilizing dihydroxoantimony(V) tetraphenylporphyrin (SbTpp), free base tetraphenylporphyrin (H2Tpp), and zinc(II) tetraphenylporphyrin (ZnTpp) chromophores were prepared by the reactions of 3-aminopropyl silica gel (SiO2-NH2) with the dihydroxoantimony(V) complex (2a), the free base (2b), and the zinc complex (2c) of 5-[4-(succinimidyloxycarbonyl)phenyl]-10,15,20-triphenylporphyrin, respectively. Absorption spectrophotometry was performed on 1a–c using a confocal laser scanning microscope (CLSM) and determined that the yields for the immobilization of SbTpp, H2Tpp, and ZnTpp on SiO2-NH2 were 31.7, 95.9, and 45.1%, respectively. Moreover, 1a was converted into its acetyl analog (1a’) by the acetylation of the axial hydroxo ligands and aminopropyl of 1a with Ac2O, since the interactions of the SbTpp chromophore with the residual amino group on SiO2 was observed by spectroscopic analysis using CLSM. In micro-channel reactors (MCR), the photoreaction of 1a’ with Et2NH induced demetallation to produce 1b immobilizing H2Tpp chromophore. Moreover, the reaction of 1b with Zn(OAc)2 produced 1c immobilizing ZnTpp chromophore. Thus, micro-silica gel beads (1a) were transformed into 1c in a micro-region of a silica gel surface by way of photochemical reaction with Et2NH and subsequent metallation with Zn(OAc)2.

Keywords
Porphyrin chromophore; Absorption spectrophotometry; Confocal laser scanning microscope; Micro-channel reactor
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Preparation and characterization of porphyrin chromophores immobilized on micro-silica gel beads
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 197, Issue 1, 10 June 2008, Pages 101–109
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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