title: A sensitive A3B porphyrin nanomaterial for CO2 detection.
abstract: 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%.
authors.affiliation: Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania. efagadar@yahoo.com.
authors.forename: Eugenia
authors.initials: E
authors.lastname: Fagadar-Cosma
authors.affiliation: Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania. danavlascici@yahoo.com.
authors.forename: Dana
authors.initials: D
authors.lastname: Vlascici
authors.affiliation: CAICAM Department, Faculty of Industial Chemistry and Environmental Engineering, Politehnica University, V. Parvan Bv., No. 6, 300223 Timisoara, Romania. gfagadar@yahoo.com.
authors.forename: Gheorghe
authors.initials: G
authors.lastname: Fagadar-Cosma
authors.affiliation: Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania. anca_palade@yahoo.com.
authors.forename: Anca
authors.initials: A
authors.lastname: Palade
authors.affiliation: Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania. ancalascu@yahoo.com.
authors.forename: Anca
authors.initials: A
authors.lastname: Lascu
authors.affiliation: Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania. ionelacreanga@yahoo.com.
authors.forename: Ionela
authors.initials: I
authors.lastname: Creanga
authors.affiliation: Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania. mihaione2002@yahoo.com.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Birdeanu
authors.affiliation: Lasers Department, National Institute for Lasers, Plasma & Radiation Physics, P.O. Box MG-36, Magurele, 077125 Bucharest, Romania. rodica_cristescu@yahoo.com.
authors.forename: Rodica
authors.initials: R
authors.lastname: Cristescu
authors.affiliation: National R&D Institute for Microtechnology, Erou Iancu Nicolae Street, No. 126 A, Voluntari, 077190 Bucharest, Romania. ileana.cernica@imt.ro.
authors.forename: Ileana
authors.initials: I
authors.lastname: Cernica
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis*; D004784:Environmental Monitoring; D057927:Hydrophobic and Hydrophilic Interactions; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D011166:Porphyrins / Q000737:chemistry*; D013026:Space Flight; D013499:Surface Properties
chemical_list: C000600061:A3B porphyrin; D011166:Porphyrins; D002245:Carbon Dioxide