Porphyrin-rhodamine conjugates as new materials with sensing ability
2016; Elsevier BV; Volume: 135; Linguagem: Inglês
10.1016/j.dyepig.2016.04.003
ISSN1873-3743
AutoresSónia M.G. Pires, Cristina Núñez, Vanda Vaz Serra, Antonio Sánchez‐Coronilla, M. Amparo F. Faustino, Mário M.Q. Simões, Artur M. S. Silva, Maria G. P. M. S. Neves, José Luís Capelo, Carlos Lodeiro,
Tópico(s)Electrochemical sensors and biosensors
ResumoConjugates based on porphyrin (porph) and rhodamine (rh) moieties linked by amide bonds, dyad 1 (porph-spacer-rh) and triad 2 (porph-spacer-rh-spacer-porph), were prepared respectively from precursor 1 and precursor 2. The sensing ability of precursor 1, dyad 1 and triad 2 towards the divalent metal ions Cu2+, Zn2+, Cd2+, Pb2+, Hg2+ and the monovalent Hg+ was explored in solution by absorption and fluorescence spectroscopy as well as in gas phase using matrix-assisted laser desorption/ionization (MALDI)-TOF mass spectrometry. In solution one-metal-per-ligand molar ratio was obtained with precursor 1 and triad 2, however, a two-metal-per-ligand molar ratio was observed with dyad 1. Additionally, the results obtained by MALDI-TOF-MS confirmed the gas-phase sensing abilities of dyad 1 towards all metal ions tested and of triad 2 towards Zn2+. Computational DFT calculations confirm the same stoichiometry.
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