A Sensitive A(3)B Porphyrin Nanomaterial for CO2 Detection

作者：Fagadar Cosma Eugenia; Vlascici Dana; Fagadar Cosma Gheorghe; Palade Anca; Lascu Anca; Creanga Ionela; Birdeanu Mihaela; Cristescu Rodica; Cernica Ileana

来源：Molecules, 2014, 19(12): 21239-21252.

DOI：10.3390/molecules191221239

• asymmetric A(3)B porphyrins
• UV-vis spectroscopy
• sensitivity to CO2
• self-assembling
• AFM

The present report deals with the tailoring, preparation and characterization of novel nanomaterials sensitive to CO2 for use in detection of this gas during space habitation missions. A new nanostructured material based on mixed substituted asymmetrical A(3)B porphyrin: 5-(4-pyridyl)-10,15,20-tris(3,4-dimethoxyphenyl)-porphyrin (PyTDMeOPP) was synthesized and characterized by H-1-NMR, FT-IR, UV-vis, fluorescence, MS, HPLC and AFM. Introducing one pyridyl substituent in the 5-meso-position of porphyrin macrocycle confers some degree of hydrophilicity, which may cause self-assembly properties and a better response to increased acidity. The influence of pH and nature of the solvent upon H and J aggregates of the porphyrin are discussed. Porphyrin aggregation at the air-THF interface gave a triangular type morphology, randomly distributed but uniformly oriented. When deposition was made by multiple drop-casting operations, a network of triangles of uniform size was created and a porous structure was obtained, being reorganized finally in rings. When the deposition was made from CHCl3, ring structures ranging in internal diameter from 300 nm to 1 mu m, but with the same width of the corona circular of approx. 200 nm were obtained. This porphyrin-based material, capable of generating ring aggregates in both THF and CHCl3, has been proven to be sensitive to CO2 detection. The dependence between the intensity of porphyrin UV-vis absorption and the concentration of CO2 has a good correlation of 98.4%.

• 出版日期2014-12