A Sensitive A3B Porphyrin Nanomaterial for CO2 Detection

Molecules

Eugenia Fagadar-Cosma⁴  Dana Vlascici⁴  Gheorghe Fagadar-Cosma²  Anca Palade⁴  Anca Lascu⁴  Ionela Creanga⁴  Mihaela Birdeanu⁴  Rodica Cristescu³  Ileana Cernica¹ 

[1] National R&D Institute for Microtechnology, Erou Iancu Nicolae Street, No. 126 A, Voluntari, 077190 Bucharest, Romania; E-Mail:;CAICAM Department, Faculty of Industial Chemistry and Environmental Engineering, Politehnica University, V. Parvan Bv., No. 6, 300223 Timisoara, Romania; E-Mail:;Lasers Department, National Institute for Lasers, Plasma & Radiation Physics, P.O. Box MG-36, Magurele, 077125 Bucharest, Romania; E-Mail:;Department of Organic Chemistry, Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223 Timisoara, Romania; E-Mails:

关键词: asymmetric A₃B porphyrins;    UV-vis spectroscopy;    sensitivity to CO₂;    self-assembling;    AFM;   

DOI  :  10.3390/molecules191221239

来源: mdpi

【 摘 要 】

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%.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.