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Optochemical properties of gas-phase protonated tetraphenylporphyrin investigated using an optical waveguide NH3
Gulimire Tuerdi1, Patima Nizamidin1, Nuerguli Kari1
1College of Chemistry and Chemical Engineering, Xinjiang University Urumqi 830046 China ablizyimit@xju.edu.cn +86-991-8580191 +86-991-8580191.
Abstract:
5,10,15,20-Tetraphenylporphyrin (TPP) was synthesized, and a glass optical waveguide (OWG, which restricts and maintains the light energy in a specific, narrow space and propagates along the space axially) was coated with a gas-phase protonated TPP thin film to develop a sensor for NH3 gas detection. The results show that the TPP thin film agglomerated into H-based J-type aggregates after H2S gas exposure. The molecules in the protonated TPP film OWG sensor acted as NH3 receptors because the gas-phase protonated TPP film morphologically changed from J-type aggregates into free-base monomers when it was deprotonated by NH3 exposure. In this case, H2S gas could be used to increase the relative amount of J-type aggregates in the TPP film and restore the sensor response. The reversible surface morphology of the TPP film was analyzed by 1H NMR spectroscopy, atomic force microscopy, and UV-vis spectroscopy.
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