Journal
TETRAHEDRON
Volume 70, Issue 20, Pages 3361-3370Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2013.07.022
Keywords
Corroles; Porphyrins; Coumarins; Chemosensors; Mercury; Fluoride; Cyanide; Acetate ion; Agarose; Cellulose
Categories
Funding
- Xunta de Galicia (Spain) [10CSA383009PR]
- Scientific PROTEOMASS Association (Portugal)
- Fundacao para a Ciencia e a Tecnologia (FCT, Portugal)
- European Union
- QREN
- FEDER
- COMPETE
- QOPNA [PEst-C/QUI/UI0062/2011]
- Portuguese National NMR Network
- FCT [SFRH/BD/64155/2009, SFRH/BPD/72557/2010, SFRH/BPD/63237/2009]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/63237/2009, SFRH/BD/64155/2009] Funding Source: FCT
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Corroles and porphyrins are very promising probes to be used as materials for anion and metal ion detection. Here, we present the synthesis and characterization of two new corrole-coumarin derivatives 7-8 and some porphyrin-coumarin analogs 3-6. The sensing ability of the metalloconjugates was studied in the presence of spherical (F-, Cl-), linear (CN-), and bulky anions (CH3COO-). The porphyrin free-base conjugates were studied with Na+, Ca2+, Zn2+, Cd2+, Pb2+, Fe2+, Ba2+, Cu2+, Ag+, and Hg2+, showing a calorimetric effect (color change from purple to yellow) and an unprecedented selectivity for Hg2+. The insertion of coumarin moiety confers an unusual solubility of these conjugates in ethanol. One of the porphyrin free-base conjugate was fully studied in a mixture EtOH/H2O (50:50) and showed a similar behavior with Hg2+. Under these conditions, the conjugate presented a higher association constant than in toluene and was able to detect and quantify a minimal amount of 0.6 ppm and 1.2 ppm of Hg2+, respectively. Having in mind the biological and environmental application of these conjugates, non-expensive solid supports, like agarose and natural cellulose polymers were developed. In the cellulose support material (filter paper) the calorimetric effect for Hg2+ reveals a similar behavior as in solution. In addition pH studies carried out with the same conjugate showed a green color at low pH and a yellow color at high pH values in solution and in solid supports. (C) 2013 Elsevier Ltd. All rights reserved.
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