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Open AccessArticle

A Sensitive A3B Porphyrin Nanomaterial for CO2 Detection

Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania
Department of Chemistry, Chemistry-Biology-Geography Faculty, West University of Timisoara, Pestalozzi Street, No. 16, 300115 Timisoara, Romania
CAICAM Department, Faculty of Industial Chemistry and Environmental Engineering, Politehnica University, V. Parvan Bv., No. 6, 300223 Timisoara, Romania
National Institute for Research and Development in Electrochemistry and Condensed Matter, P. Andronescu Street, No. 1, 300224 Timisoara, Romania
Lasers Department, National Institute for Lasers, Plasma & Radiation Physics, P.O. Box MG-36, Magurele, 077125 Bucharest, Romania
National R&D Institute for Microtechnology, Erou Iancu Nicolae Street, No. 126 A, Voluntari, 077190 Bucharest, Romania
Author to whom correspondence should be addressed.
Molecules 2014, 19(12), 21239-21252;
Received: 4 November 2014 / Revised: 11 December 2014 / Accepted: 11 December 2014 / Published: 17 December 2014
(This article belongs to the Section Molecular Diversity)
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 A3B porphyrin: 5-(4-pyridyl)-10,15,20-tris(3,4-dimethoxyphenyl)-porphyrin (PyTDMeOPP) was synthesized and characterized by 1H-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 µm, 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%. View Full-Text
Keywords: asymmetric A3B porphyrins; UV-vis spectroscopy; sensitivity to CO2; self-assembling; AFM asymmetric A3B porphyrins; UV-vis spectroscopy; sensitivity to CO2; self-assembling; AFM
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Fagadar-Cosma, E.; Vlascici, D.; Fagadar-Cosma, G.; Palade, A.; Lascu, A.; Creanga, I.; Birdeanu, M.; Cristescu, R.; Cernica, I. A Sensitive A3B Porphyrin Nanomaterial for CO2 Detection. Molecules 2014, 19, 21239-21252.

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